Encyclopedia of the Eye

Author: Dartt   Darlene A.;Besharse   Joseph;Dana   Reza  

Publisher: Elsevier Science‎

Publication year: 2010

E-ISBN: 9780123742032

P-ISBN(Paperback): 9780123741981

P-ISBN(Hardback):  9780123741981

Subject: Q189 Neurobiology;R3 Basic Medical

Language: ENG

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Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Description

As the first comprehensive reference for the eye, its support structures, diseases, and treatments, Encyclopedia of the Eye is an important resource for all visual scientists, ophthalmologists, and optometrists, as well as researchers in immunology, infectious disease, cell biology, neurobiology and related disciplines. This four-volume reference is unique in its coverage of information on all tissues important for vision, including the retina, cornea and lens. It also covers the physiological and pathophysiologic processes that affect all eye tissues.

This Encyclopedia is invaluable for graduate students and postdoctoral fellows who are seeking an introduction to an area of eye research. Each chapter explains the basic concepts and provides references to relevant chapters within the Encyclopedia and more detailed articles across the wider research literature. The Encyclopedia is also particularly useful for visual scientists and practitioners who are researching a new area, seeking deeper understanding of important research articles in fields adjacent to their own, or reviewing a grant outside their immediate area of expertise.

  • Written by experts at a level that permits students to grasp key elements of a specific subject
  • Provides an entryway into the major features of current eye research
  • No other source puts this much information, so well-indexed and with so many helpful full color figures and graphics, in the hands of the oph

Chapter

A

Concluding Statements

Acknowledgments

Further Reading

Anatomy and Regulation of the Optical Nerve Blood Flow

Glossary

Introduction

Anatomy of the Vascular Supply

Retina

Choroid

Optic Nerve

Histology of Blood Vessels in the Optic Nerve

Regulation of Ocular Blood Flow

Technology for Measuring Ocular Blood Flow

Color Doppler Imaging

Angiography

Blue Field Entotpic Technique

Laser Doppler Velocimetry

Retinal Vessel Diameters

Laser Speckle Technique

Laser Doppler Flowmetry

Pulsatile Ocular Blood Flow

Optical Doppler Tomography

Future Studies

Further Reading

Angiogenesis in Inflammation

Glossary

Introduction

The Process and Models of Angiogenesis

Mediators of Angiogenesis

Angiogenesis Inhibition: Therapeutic Targeting of Angiogenesis in Inflammation

Acknowledgments

Further Reading

Angiogenesis in Response to Hypoxia

Glossary

Introduction

Hypoxia and HIFs

HIFs and Angiogenic Factors

HIFs and Ocular Angiogenesis

Further Reading

Angiogenesis in the Eye

Glossary

Introduction: Angiogenesis in the Eye

Steps of Angiogenesis

Vessel vasodilatation and degradation of the ECM

Endothelial cell proliferation, migration, and formation of tubular structures

Corneal Angiogenesis

Angiogenic and Antiangiogenic Molecules

Diabetic Retinopathy and Retinal Angiogenesis

Central Retinal Vein Occlusion and Retinal Angiogenesis

AMD and choroidal neovascularization

Choroidal Neovascularization

Tumor Angiogenesis in the Eye

Further Reading

Angiogenesis in Wound Healing

Glossary

Introduction

Cellular and Molecular Basis of Wound Healing

Molecular and Cellular Regulators of Wound Angiogenesis

Angiogenic Factors

Extracellular Matrix

Pericytes and Stromal Cells in Angiogenesis

Neovascularization and EPC

Therapeutic Angiogenesis in Chronic Wound Healing

Further Reading

Animal Models of Glaucoma

Glossary

Mammalian Models

Primate Models of Glaucoma

Rodent Models of Glaucoma

Rat Models

Mouse Models

Pressure-induced mouse models

Normal-tension mouse models

Developmental mouse models

Other Mammalian Models

Nonmammalian Models

Zebrafish

Other Nonmammalian Models

Conclusion

Further Reading

Anti-Angiogenic Properties of Vitreous

Glossary

Vitreous

Development of Vitreous

Switch from Pro-Angiogenic to Anti- Angiogenic in Development

Transforming Growth Factor Beta

Pigment Epithelium-Derived Factor

Endostatin

Thrombospondin-1

Other Anti-Angiogenic Factors in Vitreous

Angiogenic Factors in Vitreous

Balance between Anti-Angiogenic and Angiogenic Factors

Conclusions

Acknowledgments

Further Reading

Antigen-Presenting Cells in the Eye and Ocular Surface

Glossary

Introduction

Antigen-Presenting Cells of the Ocular Surface

Corneal APCs

Epithelial Langerhans cells

Stromal APCs

Corneal APCs in Inflammation

The Function of APCs in Corneal Transplantation

The Function of APCs in Microbial Keratitis

Conjunctival APCs

Role of APCs in Allergic Eye Disease

APCs of the Uvea

Anterior Chamber-Associated Immune Deviation

Role of APCs in Age-Related Macular Degeneration

Role of APCs in EAU

APCs of the Retina

APCs of the Sclera

Conclusions

Further Reading

Artificial Cornea

Glossary

The Need for Artificial Corneas

Desired Characteristics for an Implantable AC

Synthetic Artificial Corneas or Keratoprosthesis

Self-Assembled Corneal Equivalents

Bioengineered ACs that Address Regeneration

Future Directions

Further Reading

Astigmatism

Glossary

The Definition and Etymology of Astigmatism

Ocular Astigmatism: Prevalence and Age- Related Changes

The Origin of Ocular Astigmatism

Image Formation and Refractive Specification in Astigmatism

Standard Notation for Specifying Astigmatic Refraction

Ocular Image Formation in Astigmatism

Classification of Ocular Astigmatism

Astigmatic Blurring and Visual Perception

Oblique Astigmatism

Ocular Astigmatism During Near Work

Specialized Notations for Specifying Astigmatic Refraction

The Measurement of Ocular Astigmatism

Keratometry

Wave Front Analysis

The Correction of Ocular Astigmatism

Spectacles

Contact Lenses

Surgery

Not Correcting Ocular Astigmatism

Summary

Further Reading

Avascularity of the Cornea

Glossary

Corneal Histology

Corneal Avascularity and Optical Clarity

Endogenous Anti-Angiogenic Mechanisms

Loss of Corneal Avascularity

Immune Privilege of the Avascular Cornea

Corneal Transplant and Avascularity

Corneal Alymphaticity and Allograft Rejection

The Avascular Cornea as an Angiogenesis Study Platform

Conclusions

Further Reading

B

Binocular Vergence Eye Movements and the Near Response

Glossary

A Coarse-to-Fine Strategy for Vergence

Cross-Coupling of Voluntary and Involuntary Motor Responses and the Near Response

Ideal Cross-Links for Three-Dimensional Viewing Geometry

Horizontal Vergence Coupling

Vertical Vergence Coupling

Cyclo-Vergence Coupling

Effects of Listing's Law and Coupling with Convergence on Stereoscopic Depth Perception

Further Reading

Biological Properties of the Trabecular Meshwork Cells

Glossary

Introduction

Cell Culture

HTM Cell Characteristics

HTM Cell Phagocytosis

Glaucoma Models

Glucocorticoid Treatment

Transforming Growth Factor-beta

Oxidative Stress

Mechanical Stretch

Biophysical Cues

Summary

Acknowledgments

Further Reading

The Biology of Schlemm's Canal

Glossary

Introduction

Development

The Conventional Outflow Pathway

Trabecular Meshwork

Schlemm's Canal

Mechanical Environment

Cell Attachments

Cell-Cell Interactions

Cell-ECM Interactions

Cell-Cell and Cell-ECM Adhesion Strength

Funneling Theory

Concluding Remarks

Biomechanics of Aqueous Humor Outflow Resistanceast

Glossary

Regions of Low Outflow Resistance

The Inner-Wall Region of Schlemm's Canal

The Generation of Flow Resistance in the Inner-Wall Region of Schlemm's Canal

The JCT

The basement membrane

The inner-wall endothelium of Schlemm's canal

Pores as possible fixation artifacts and the possible importance of flow through inner-wall cell junctions or through water cha

Further Reading

Biomechanics of the Optic Nerve Headast

Glossary

The Optic Nerve Head as a Biomechanical Structure

Mechanical Environment of the ONH and Peripapillary Sclera

Overview of the Mechanical Environment of the.ONH and Peripapillary Sclera

Mechanical Response of the ONH to Acutely Elevated IOP

The Contribution of the Sclera to ONH Biomechanics

Characterization of scleral geometry

Characterization of scleral material properties

Engineering Models of Stress and Strain in the ONH and Peripapillary Sclera

Closed form solutions

Numerical solutions.- FE analysis

Other Acute, .IOP-Related. Changes in the ONH

Restructuring and Remodeling of the ONH

Normal Aging

Alterations in Connective Tissue Architecture, Cellular Activity, Axoplasmic Transport, and Blood Flow in Early Glaucoma

Alterations in Connective Tissue Architecture, Cellular Activity, Axoplasmic Transport, and Blood Flow in Later Stages of Glauc

Biomechanical Manipulation of ONH and Peripapillary Scleral Cells in Culture

Future Directions

Clinical Implications

Basic Research Directions

Further Reading

Blinking Mechanisms

Glossary

Inter- and Intrasubject Variations in Blink Rate

Benefits of Complete Blinks

Consequences of Incomplete Blinking

Lid Wiper Epitheliopathy Mechanisms and Symptoms

Indications for Blink Efficiency Exercises

Lubricant Therapy: Incomplete Blink Habit Reversal; Optimizing Lid Wiper and Corneal Therapy

Conclusions

Further Reading

Blood-Retinal Barrier

Glossary

Blood-Retinal Barrier

Inner Blood-Retinal Barrier

Retinal endothelial cells

Retinal endothelial TJs

Müller cells, astrocytes, and pericytes

Outer Blood-Retinal Barrier

RPE cells

RPE tight junctions

Polarity of the outer and inner barriers: TJ modulation

Other factors regulating the molecular movement in the eye

The Blood-Retinal Barrier and Ocular Immune Privilege

Clinical evaluation of the blood-retinal barrier

Blood-retinal barrier and macular edema

Relevance of BRB to Treatment of Retinal Diseases

Further Reading

Breakdown of the Blood-Retinal Barrier

Glossary

Introduction

Tight Junctions

Vesicular Transport

Role of Inflammation

Molecular Mechanisms

Assessing BRB Breakdown

Inhibiting BRB Breakdown

Prospects for the Future

Conclusions

Acknowledgments

Further Reading

Breakdown of the Retinal Pigmented Epithelium Blood-Retinal Barrier

Glossary

Introduction

RPE Barrier Structure

RPE Barrier Functions

Transport and Fluid Flow within the RPE and Eye

RPE Na,K-ATPase pump

Methods to Assess RPE Barrier Structure and Function

Tight Junction Structure

Barrier Function

Assays That Measure Barrier Properties of RPE

Clinical Conditions Associated with Breakdown of the RPE Barrier

Inflammation/Infection

Age-Related Macular Degeneration

Diabetes Mellitus

Proliferative Vitreoretinopathy

Drug Toxicity

Central Serous Retinopathy

Retinitis Pigmentosa

Growth Factors

Studies to Increase the Function of the BRB

Further Reading

C

Cellular Origin, Formation and Turnover of the Vitreous

Glossary

The Composition of the Vitreous Body Extracellular Matrix

Synthesis of VB Proteins in the Eye and Assembly of the VB Gel

The Turnover of VB Proteins

Acknowledgments

Further Reading

Central Retinal Vein Occlusion

Glossary

Pathogenesis

Site of Occlusion in CRVO

Demographic Characteristics

Clinical Features

Differentiation of Ischemic from Nonischemic CRVO

Course of CRVO

Complications

Management of CRVO

Medical Treatments

Surgical or Invasive Treatments

Panretinal Photocoagulation

Primary Factor Responsible for Blindness in Ischemic CRVO with Neovascular Glaucoma

Overall Conclusions About Advocated Treatments for CRVO

Natural History of Visual Outcome in CRVO

Investigations of CRVO Patients

Further Reading

Chick Metabolism in the Chick Retina

Glossary

Introduction

Clock Gene Expression

Circadian Regulation of Cyclic AMP in Retina

Circadian Regulation of Melatonin Biosynthesis

Other Rhythms of Gene Expression and Metabolism in the Chick Retina

Conclusion

Acknowledgments

Further Reading

Choroidal Neovascularization

Glossary

Choroidal Neovascularization

Clinical Detection of CNV

Histopathology of CNV

Animal Models of CNV

Laser-induced CNV

Growth factor models

Pathobiology of CNV

Angiogenesis

Vascular endothelial growth factor

Other angiogenic factors

Natural inhibitors of angiogenesis

Inflammation

Monocytes and macrophages

Complement

Vasculogenesis

Therapy of CNV

Variants of Pathologic Neovascularization in NVAMD

Polypoidal choroidal vasculopathy

Retinal angiomatous proliferation

Future Directions

Further Reading

Chromatic Function of the Cones

Glossary

Introduction

Photopigments and Phototransduction

Fundamental Spectral Sensitivities

Prereceptoral Attenuation

Cone Spectral Sensitivities

Template for Cone Spectral Sensitivity

Cone Gains and von Kries Scaling

Isolating Cone Responses

Selective Chromatic Adaptation

Silent Substitution

Rod Intrusion

Spatial Densities

Individual Variations

Retinal Distributions

Eccentricity and Chromatic Function

Postreceptoral Spectra

Cone Opponency

Advantages of Cone Opponency

Further Reading

Ciliary Blood Flow and its Role for Aqueous Humor Formation

Glossary

Introduction

Ciliary Circulation

Ultrafiltration

Active Secretion

Relationship between Ciliary Blood Flow and Aqueous Production

Acknowledgments

Further Reading

The Circadian Clock in the Retina Regulates Rod and Cone Pathways

Glossary

Introduction

Rod and Cone Pathways in the Fish Retina

Day/Night Differences in the Light Responses of Neurons in the Fish Outer Retina

The Circadian Clock in the Retina, and Not the Retinal Response to the Ambient Illumination, Controls Rod-Cone Coupling

The Circadian Clock in the Mammalian Retina Controls Rod-Cone Coupling

A Circadian Clock Pathway in the Retina

Functional Implications of Circadian Clock Control of Rod-Cone Coupling

Further Reading

Circadian Photoreception

Glossary

Introduction

Nonvisual Photoreception

Melanopsin and the Mammalian ipRGC

Functions of ipRGCs

Further Reading

Circadian Regulation of Ion Channels in Photoreceptors

Glossary

Circadian Oscillators Regulate the Functions of the Visual System

Circadian Regulation of Photoreceptors

Ion Channels in Photoreceptors

Circadian Regulation of cGMP-gated Cation Channels

Signaling Pathways Leading to the Circadian Regulation of CNGCs

Circadian Phase-Dependent Modulation of Cone CNGCs by Dopamine

Modulation of Cone CNGCs by Somatostatin

Circadian Regulation of L-VGCCs

Circadian Regulation of Other Photoreceptor Ion Channels: Potassium Channels (K+ Channels)

Conclusion

Further Reading

Circadian Rhythms in the Fly's Visual System

Glossary

The Fly's Visual System

The Fly's Circadian System

Circadian Rhythms in the Retina of the Compound Eye

Circadian Rhythms in the First Visual Neuropil (Lamina)

Circadian Plasticity of Synaptic Contacts

Circadian Plasticity of Second-Order Neurons and Glial Cells

Circadian Rhythms in Organelles inside Photoreceptor Terminals

Neurotransmitter Regulation of Circadian Rhythms in the Visual System

Larval Visual System

Circadian Circuits in the Fly's Visual System

The Role of Circadian Clocks in the Visual System

Further Reading

Color Blindness: Acquired

Glossary

Introduction

Classifying Acquired Color Blindness

Discriminating Acquired from Inherited Color Blindness

Conditions Resulting in an Acquired Color-Vision Defect

Ocular Diseases

Age-related macular degeneration

Glaucoma

Retinitis pigmentosa

Cataract

Diabetic retinopathy

Optic neuritis

Cortical Defects

Cerebral achromatopsia

Neurodegenerative diseases

Toxin-Induced Defects

Digitalis

PDE5 inhibitors

Chloroquine

Ethambutol

Vitamin A deficiency

Exposure to metals and chemicals

Conclusion

Further Reading

Color Blindness: Inherited

Glossary

Introduction

Photoreceptor Basis of Human Color Vision

Genetic Basis of Human Color Vision

Red-Green Color-Vision Deficiencies

Tritan Color-Vision Deficiencies

Blue-Cone Monochromacy

Achromatopsia

Conclusion

Further Reading

The Colorful Visual World of Butterflies

Glossary

Introduction

The Butterflies and Their Evolutionary History

Color Vision and the Butterfly Eye

Spectral Heterogeneity of Butterfly Eyes

Diversification of Visual Pigments via Gene Duplication and Positive Selection

Diversification of Photoreceptor Types via Filtering Pigments

Evolution of Sexually Dimorphic Eyes: Opsin Duplications and Sex-Specific Filtering Pigment Expression

Ecological Significance of Butterfly Visual System Diversity

Conclusions

Further Reading

Concept of Angiogenic Privilege

Glossary

Introduction: Angiogenesis and Lymphangiogenesis

Corneal Angiogenic Privilege

Corneal Avascularity

Angiogenic and Anti-Angiogenic Molecules Involved in Corneal Neovascularization

Vascular endothelial growth factors

Vascular endothelial growth factor

VEGF-C and VEGF-D

Basic fibroblast growth factor

Inhibitory PAS (Per/Arnt/Sim) domain protein

Cornea and Corneal Epithelium

Limbal Barrier Function

Angiogenic Privilege and Immune Privilege

Further Reading

Cone Photoreceptor Cells: Soma and Synapse

Glossary

Introduction

Structure

Morphology and Topology

Axon and Terminal

Synapse

Invagination and Triad

Biophysical Properties

Gap Junctions

Morphological Implications of Spectral Sensitivity

Function

Adaptation and Predictive Coding

Synaptic Transfer Function

Rate of Vesicle Release

Electrical Coupling

Negative Feedback

Theory of Ephaptic Feedback

Bandpass Adaptation Filter

Conclusion

Acknowledgments

Further Reading

Congenital Cranial Dysinnervation Disorders

Glossary

Introduction

Early Concepts and Nomenclature

The Concept of Congenital Cranial Dysinnervation Disorders

Current Genetically Defined CCDDs

Congenital Fibrosis of the Extraocular Muscles Type 1 (CFEOM1; MIM #135700)

Congenital Fibrosis of the Extraocular Muscles Type 2 (CFEOM2; MIM #602078)

Congenital Fibrosis of the Extraocular Muscles Type 3 (CEOM3; MIM #600638)

Horizontal Gaze Palsy and Progressive Scoliosis (HGPPS; MIM #607313)

The HOXA1 Spectrum (BSAS and ABDS; MIM #601536)

Duane Retraction Syndrome (DRS)

Duane-Radial Ray Syndrome (DRRS or Okihiro syndrome; MIM #607323)

Duane Retraction Syndrome (DURS2-DRS; MIM #604356)

Discussion

Further Reading

Conjunctiva Immune Surveillance

Glossary

Conjunctival Morphology and Function Are Closely Interacting for Immune Surveillance

Epithelial Defense Mechanisms

Epithelial morphology and function

Epithelial Immune Surveillance Takes Care of Environmental Antigens

Physical and physicochemical barriers keep antigens outside

The mechanical washing effect of the tear film wipes away antigens and detritus

Epithelial innate immune defense factors

PRRs on epithelial cells provide an external alarm system

The conjunctival epithelium secretes diverse AMPs

Conventional antibacterial factors are surprisingly versatile defense tools

Conjunctival Lamina Propria: Morphology and Function of the Diffuse Mucosal Immune System

Diffusely arranged lymphoid and innate cells contribute to conjunctival immune surveillance

Different subtypes of lymphocytes occur in the conjunctiva

The conjunctiva contributes actively to the secretory immune system

Local conjunctival plasma cells produce mainly the anti-inflammatory IgA

SIgA performs diverse protective and antiinflammatory functions at the ocular surface

Lamina Propria Leukocytes Provide Immediate Innate Response against Invading Pathogens and can Orchestrate an Inflammatory Reac

Protective functions of conjunctival lamina propria leukocytes

HEVs Provide the Regulated Immigration of Bone-Marrow-Derived Cells into the Tissue

Conjunctival Lymphoid Follicles Have a Typical Morphology and Function

The Topographical Distribution of CALT is in the Right Place to Assist Corneal Immune Surveillance

CALT is a Part of the Complete Eye- Associated Lymphoid Tissue

Mechanisms of Conjunctival Immune regulation

CALT Is Physiologically Biased to Tolerogenic, Anti-Inflammatory Responses

Deregulation of EALT Is a Central Component of Inflammatory Ocular Surface Disease

Further Reading

Conjunctival Goblet Cells

Glossary

Goblet Cell Development

Function of Conjunctival Goblet Cells

Control of Goblet Cell Proliferation and Mucin Secretion

Goblet Cell Proliferation

Goblet Cell Mucin Secretion

Clinical Implications of Mucin Deficiency on the Ocular Surface

Sjögren Syndrome

Vitamin A Deficiency

Topical Preservatives

Ocular Cicatrical Pemphigoid

Laser In Situ Keratomileusis

Ocular Allergies

Summary

Further Reading

Contact Lenses

Glossary

Introduction

Types of Contact Lenses

How Contact Lens Wear Affects the Ocular Surface

Effects of Contact Lens Wear on the Corneal and Limbal Epithelium

Alteration of the Lens: Cornea Resurfacing Mechanism

Adverse Events

Inflammation

Infection

Mechanical effects

Current Hot Topics in Contact Lens Research

Contact Lens Care Products

Corneal Infection

Orthokeratology

Summary

Further Reading

Contrast Sensitivity

Glossary

Contrast-Detection Threshold

Psychophysical Assessment of Vision

Spatial Frequency Channels

Contrast Sensitivity Function

Temporal Contrast Sensitivity

Further Reading

Control of Aqueous Humor Flow

Glossary

The Significance of Aqueous Humor Flow

Measuring Aqueous Humor Flow

What is the Aqueous Humor Flow Rate

The Normal Eye

Aqueous Humor Flow is not Affected by Elevated or Decreased Intraocular Pressure

Aqueous Humor Flow Decreases Slowly with Age

Aqueous Humor Flow Changes Dramatically during Sleep

Flow in Abnormal Eyes

Pharmacologic Agents and Hormones

beta-Adrenergic Antagonists

alpha2-Adrenergic Agonists

Carbonic Anhydrase Inhibitors

Other Classes of Drugs and Hormones

Control of Aqueous Humor Production, the Basis of Pharmacologic Manipulation of Intraocular Pressure

Summary

Further Reading

Coordinating Division and Differentiation in Retinal Development

Glossary

Introduction

A Few Basics of Cell-Cycle Regulation

Cyclins and Cdks in Retinal Development

The Rb Family in Retinal Development

Ink4 CKIs and p19Arf in Retinal Development

Cip/Kip CKIs in Retinal Development

E2Fs in Retinal Development

Separating Rate, Birth, and Exit

Distance from Notch Predicts Birth

Birth Does Not Require Exit

Mechanisms Linking Birth to Exit

Conclusion

Acknowledgments

Further Reading

Corneal Angiogenesis

Glossary

Introduction

Angiogenesis

Etiology and Epidemiology of Corneal NV

Clinical Manifestations

Mechanisms Underlying the Maintenance of Corneal Avascularity

Corneal Angiogenic Privilege: The Balance between Angiogenesis and Anti- Angiogenesis

Angiogenic Molecules

Vascular endothelial growth factor

Basic fibroblast growth factor

Matrix metalloproteinases

Lipid mediators

Anti-Angiogenic Molecules

Angiostatin

Endostatin and neostatins

Pigment-epithelial-derived factor

Arresten, canstatin, and tumstatin

Therapy

Medical Treatments

Surgical Treatment

Further Reading

Corneal Dystrophies

Glossary

Introduction

Anterior Dystrophies

Epithelial and EBM Dystrophies

EBM Dystrophy

Meesman's

Bowman's Layer Dystrophies

Reis-Buckler's

Thiel-Behnke

Stromal Dystrophies

Lattice

Granular

Granular type 1

Granular type 2

Macular

Rare Stromal Dystrophies

Gelatinous drop-like dystrophy

Schnyder's crystalline dystrophy

Central cloudy dystrophy

Congenital hereditary stromal dystrophy

Posterior amorphous dystrophy

Fleck dystrophy

Posterior Dystrophies

Fuchs' Endothelial

Posterior Polymorphous Membrane

Congenital Hereditary Endothelial Dystrophy

Further Reading

Corneal Endothelium: Overview

Glossary

Anatomy

General Description

Cell-to-Cell Junctions

Embryology

Initial Development

Role of Transcription Factors

Biochemistry and Metabolism

Glucose and Energy Metabolism

Cell Division and Replenishment

Cytokines and Immune Privilege

Proteins Synthesized for External Transport

The Role of the Corneal Endothelium in Deturgescence

Introduction

The Biochemistry of Active Deturgescence

The Physiological Control of Active Deturgescence

Genetic Diseases of the Corneal Endothelium

Fuchs' Endothelial Dystrophy

Related Posterior Membrane Dystrophies

Further Reading

Corneal Epithelium: Cell Biology and Basic Science

Glossary

The Corneal Epithelium Has Vital Functions in Vision

The Apical Squames Possess Specializations to Promote Tear Film Spreading

The Epithelial Basal Cells Adhere to the Underlying Basement Membrane via tight Adhesive Junctions called Hemidesmosomes

The Palisades of Vogt

Bowman's Layer Is an Acellular Zone Located Immediately under the Corneal Epithelial Basement Membrane

The Collagen- and Proteoglycan-Rich Corneal Stroma with Its Stromal Cells, Descemet's Membrane, and the Corneal Endothelial Cel

The Avascular Cornea

Further Reading

Corneal Epithelium: Response to Infection

Glossary

Introduction

Basic Structure and Function

Corneal Infection

TLRs and TLR-Related Molecules

Cytokines/Chemokines

Antimicrobial Molecules

beta-Defensins

Cathelicidins

Complement System

Secretory IgA

Adhesion Molecules

Neuropeptides

Innervation of the Corneal Epithelium

Substance P

Vasoactive intestinal peptide

Thymosin-beta4

Conclusion

Further Reading

Corneal Epithelium: Transport and Permeability

Glossary

Introduction

Corneal Hydration Control and Transparency

Importance of Transport Mechanisms to Epithelial Function

Primary and Secondary Ionic Transport Mechanisms

Coupling of Ionic Transport Mechanisms to Stromal Deturgescence

Other Transport Mechanisms

Receptor-Mediated Control of Corneal Epithelial Ionic Transport Functions

Cell-Volume Control and Epithelial Renewal

Ca2+ Channel and Pump Activity

K+, Cl-, and Na+ Channels

Summary

Further Reading

Corneal Epithelium: Wound Healing Junctions, Attachment to Stroma Receptors, Matrix Metalloproteinases, Intracellular Communica

Glossary

Corneal Epithelial Wound Healing: Introduction

Corneal Epithelial Wound Healing: Phases of Wound Healing Process

Corneal Nerves

Corneal Epithelial Wound Healing: Cell-Cell and Cell-Matrix Junctions

Cell-Cell Junctions: Gap Junctions

Cell-Cell Junctions: Tight Junctions

Cell-Cell Junctions: Adherins Junctions

Cell-Cell Junctions: Desmosomes

Cell-Matrix Junctions: Hemidesmosomes and Adhesion Complexes

Secreted Factors Involved in Corneal Epithelial Wound Healing

Matrix Metalloproteinases

Corneal Epithelial Wound Healing: Conclusion

Further Reading

Corneal Imaging: Clinical

Glossary

Introduction

Confocal Microscopy

Historical Overview

How it Works

Clinical Applications

The normal cornea

Pachymetry

Applications in Pathology

Other applications

Anterior Segment OCT

Historical Overview

How it Works

Clinical Applications

Conclusion

Further Reading

Corneal Nerves: Anatomy

Glossary

Origins of Corneal Nerves

Architecture of the Corneal Innervation

Limbal Plexus

Stromal and Subepithelial Plexuses

Subbasal Nerve Plexus

Intraepithelial Nerve Terminals

Corneal Nerve Neurochemistry

Corneal Nerve Remodeling

Corneal Nerve Regeneration after Ocular Surgery

Refractive Surgery

Cataract Surgery

Penetrating Keratoplasty

Mechanisms of Nerve Regrowth

Further Reading

Corneal Nerves: Function

Glossary

Functional Properties of Corneal Sensory Receptors

Response of Corneal Receptors to Local Inflammation

Effects of Injury on Corneal Nerves

Sensitivity of the Intact Cornea

Sensitivity of the Injured Cornea

Further Reading

Corneal Scars

Glossary

Introduction

Ocular Wound Healing

Corneal Wound Healing

Cell-Cell Communication

Cytokines and GFs

TGF-beta signaling pathways

Cell-ECM Communication

Suppressing or amplifying factors

Bone marrow-derived stem cells

Cellular responses

Three Phases of Corneal Wound Healing

Inflammatory phase (lasts up to 2-4weeks after injury)

Active wound-healing phase (lasts up to 4-6months after injury)

Remodeling phase (occurs from 4-6months to 3-4years after injury)

Termination of the fibrotic repair response (about 3-4years after injury)

Modulation of Scarring

Currently Available Scar-Reducing Therapies

Emerging Scar-Reducing Therapies

Conclusion

Acknowledgments

Further Reading

The Corneal Stroma

Glossary

Stromal Anatomy

Stromal Development

Stromal Cells

Transparency

Stromal Extracellular Matrix

Conclusion

Acknowledgments

Further Reading

Cornea Overview

Glossary

Anatomy of the Layers

Epithelium

Epithelial Basement Membrane

Bowman's Membrane

Stroma

Descemet's Membrane

Endothelium

Function

Protective Barrier

Transparency

Disease Processes

Epithelial Disease

Epithelial staining patterns

Epithelial iron deposition

Band keratopathy

Chemical/thermal burns

Medication toxicity

Thygeson's punctate keratitis

Subepithelial Disease

Epithelial basement membrane dystrophy

Subepithelial infiltrates

Stromal Disease

Infection

Dystrophies

Degenerations

Descemet's copper deposition

Endothelial Disease

Fuchs' dystrophy

Pseudophakic bullous keratopathy

Surgery

Surgical Intervention of Epithelial Disease

Amniotic membrane graft

Conjunctival flap

Corneal glue

Disodium ethylenediaminetetraacetic acid chelation

Limbal stem cell transplant

Phototherapeutic keratectomy

Pterygium excision

Stromal puncture

Tarsorrhaphy

Surgical Intervention of Stromal Disease

Anterior lamellar keratoplasty

Penetrating keratoplasty

Corneal biopsy

Corneal laceration repair

Refractive surgery

Prosthetic keratoplasty

Surgical Intervention of Endothelial Disease

Descements Stripping Automated Endothelial Keratoplasty

Further Reading

Cortical Cataract

Glossary

Definition

Morphology

Optical Effects

Impact on Vision

Prevalence

Causes

Further Reading

Cranial Nerves and Autonomic Innervation in the Orbit

Glossary

Complex Innervation Patterns Are Present in the Orbit

Sensory Nerves

The Optic Nerve or Cranial Nerve II

Trigeminal Nerve or Cranial Nerve V

Ophthalmic Division of the Trigeminal Nerve

Lacrimal nerve

Frontal nerve

Nasociliary nerve

Sensory root of the ciliary ganglion

Long ciliary nerves

Posterior ethmoidal nerve

Anterior ethmoidal nerve

Infratrochlear nerve

Maxillary Division of the Trigeminal Nerve

Zygomatic nerve

Infraorbital nerve

Motor Nerves

The Oculomotor Nerve or Cranial Nerve III

The Trochlear Nerve or Cranial Nerve IV

The Abducens Nerve or Cranial Nerve VI

Autonomic Nervous System Contributions to Orbital Innervation

Parasympathetic Innervation in the Orbit

Parasympathetic innervation within the oculomotor nerve

Parasympathetic innervation to the lacrimal gland

Sympathetic Innervation in the Orbit

Acknowledgments

Further Reading

The Cytoskeletal Network of the Trabecular Meshwork

Glossary

Actomyosin System in the Trabecular Outflow Route

Trabecular Outflow Enhancement Following Actomyosin Inhibition

Disruption of Microfilaments

Cytochalasins

Latrunculins

Swinholide A

TM Contractility Inhibition

Broad specificity protein kinase inhibitors (H-7)

Rho-kinase inhibitors (Y-27632, Y39983, HA-1077,H-1152, and INS117548)

Myosin II inhibitors (blebbistatin)

Actomyosin-Modulating Gene Therapy

Microtubule Inhibition

Significance of Actomyosin Inhibitionin Glaucoma Therapy

Acknowledgments

Further Reading

e9780123741981v2

Front Cover

Encyclopedia of the Eye

Copyright Page

Contributors

Editors Biographies

Editors Affiliations

Preface

Foreword

Subject Classification

Guide to use of the Encyclopedia

Contents

VOLUME 2

D

Defense Mechanisms of Tears and Ocular Surface

Glossary

Introduction

Defense Mechanisms of Tears

Defense Mechanisms of the Ocular Surface Epithelia

Mechanical/Physical Defenses

Pathogen Recognition

Antimicrobial Peptides

Other Contributions to Ocular Surface Epithelial Defense

Concluding Remarks

Acknowledgments

Further Reading

Developmental Anatomy of the Retinal and Choroidal Vasculature

Glossary

Choroidal Vascular Network

Embryology

Gross Anatomy

Physiology

Pathology

Hyaloid Vascular Network

Embryology

Physiology

Pathology

Retinal Vascular Network

Embryology

Gross Anatomy

Physiology

Pathology

Further Reading

The Development of the Aqueous Humor Outflow Pathway

Glossary

Anterior Eye Development

Ocular Mesenchyme and Development of the Chamber Angle

Anterior Segment Dygenesis

Peters Anomaly

Aniridia

Anterior Segment Dysgenesis and Glaucoma

Primary Congenital Glaucoma

Acknowledgments

Further Reading

Development of the Retinal Vasculature

Glossary

Introduction

An Overview of Human Adult Retinal Vasculature

Vasculature of the Primordial Retina

Formation of the Human Retinal Vasculature Takes Place Through Vasculogenesis and Angiogenesis

Vasculogenesis: Vascular formation through transformation from VPCs

Lack of Involvement of VEGF in Early Stages of Vascularization

Angiogenic and anti-angiogenic factors

Cell-Cell Interactions in the Formation of the Human Retinal Vasculature

Muumlller cell-endothelial cell interactions

Pericyte-endothelial cell interactions: Vessel stability

Vascular Remodeling

Vascularization and the Health of the Eye

Conclusions

Further Reading

Differentiation and Morphogenesis of Extraocular Muscles

Glossary

Introduction

Origins of Extraocular Muscles

Determination of Eye Muscle Precursors

Molecular Signatures and Muscle Differentiation

Muscle Morphogenesis

Summary

Further Reading

Drug Delivery to Cornea and Conjunctiva: Esterase- and Protease- Directed Prodrug Design

Glossary

Topical Ocular Drug Delivery

Role of Cornea in Topical Drug Delivery

Role of Conjunctiva in Ocular Drug Delivery

Transconjunctival Pathway

Subconjunctival Delivery

Conclusion

Further Reading

Dry Eye: An Immune-Based Inflammation

Glossary

Defining the Problem

Epidemiology of Dry Eye

Dry Eye Syndrome in Peri- and Post- menopausal Women

Patients on Anti-androgen Therapy

Clinical Features of Dry Eye

Chronic Pain

Ocular surface neuropathy in dry eye

Comorbidities

Quality of Life Impact

How We Secrete Normal Tears

The Lacrimal Functional Unit

The general role of the LFU in homeostasis and disease

Events on the Ocular Surface

Environmental Impact on the Ocular Surface

Afferent arm of the immune response: immunoregulation

Efferent arm of the immune response: immunoregulation

Afferent arm of the immune response during autoimmune-based inflammation

Efferent arm of the immune response during autoimmune-based inflammation

Past, Future, and Current Therapies

Artificial Tears

Corticosteroids

Cyclosporine

Mucin Secretagogues

Tetracyclines

Further Reading

Dynamic Immunoregulatory Processes that Sustain Immune Privilege in the Eye

Glossary

Introduction

Induction of ACAID

Ocular Phase of ACAID

Thymic Phase of ACAID

Splenic Phase of ACAID

Sympathetic Nervous System and ACAID

ACAID T Regulatory Cells

What is the Relevance of ACAID

Vitreous Cavity-Associated Immune Deviation

Ocular Regulatory Cells Induced In Situ

Conclusions

Further Reading

E

Embryology and Early Patterning

Glossary

Embryology

Early Patterning

Proximo-Distal Patterning of the Optic Vesicle

Specification of the RPE and NR

Dorso-Ventral Patterning of the Optic Cup

Conclusions

Further Reading

The Epidemiology of Cataract

Glossary

Introduction

Cataract Classification Systems: Characterization of Phenotype

Distribution of Different Lens Opacity Types in Different Racial Groups or Populations

Risk Factors for Cataract

Diabetes

Chronic Ultraviolet Light Exposure

Other Radiation Exposure

Other Oxidative Stress

Medications

Smoking

Genetics and Cataract

Cataract as a Predictor of Mortality

Cataract Surgery and Outcomes

Summary

Further Reading

The Evolution of Opsins

Glossary

Introduction

General Opsin Structure and Function

Type I and Type II Opsins

Major Type II Opsin Classes

Cnidops

Retinal G-Protein Receptor/Go

Rhabdomeric (Gq)

Ciliary (Gt)

Opsin and Color Vision

Molecular Basis of Wavelength Sensitivity

Opsin and Modes of Phototransduction Evolution

Further Reading

Extraocular Muscles: Extraocular Muscle Anatomy

Glossary

Gross Anatomy of the EOM within the Orbit

Histological Anatomy of the EOMs

Overall Organization

Innervation

Skeletal Muscle Fiber Types

Myosin Isoform Complexity in the EOM

Nonuniform Expression of MyHC Isoforms along the Muscle Length

Other Molecules Heterogeneously Expressed

Continuous Remodeling in Normal Adult EOM

Acknowledgments

Further Reading

Extraocular Muscles: Extraocular Muscle Involvement in Disease

Glossary

Introduction

The EOMs Are Selectively Spared in Muscular Dystrophies

The EOMs Are Spared in Motor Neuron Disease

The EOMs Are Selectively Affected in the Miller Fisher Syndrome

The EOMs Are Frequently Involved in Myasthenia Gravis

The EOMs Are Frequently Involved in Mitochondrial Myopathies

The EOMs Are Involved in Oculopharyngeal Dystrophy

Miscellaneous

Further Reading

Extraocular Muscles: Extraocular Muscle Metabolism

Glossary

Insights from Gene Expression Profiling

Lactate: An Oxidizable Substrate for the Extraocular Muscle

Creatine Kinase, the Missing ATP Buffer in the Extraocular Muscle

Mitochondrial Content in the Extraocular Muscles

Mitochondria as Calcium Sinks in the Extraocular Muscle

Are Extraocular Muscle Mitochondria Different

Matching Mitochondrial Capacity to Contractile Function

Matching Energy Supply to Demand

Acknowledgments

Further Reading

Extraocular Muscles: Functional Assessment in the Clinic

Glossary

Normal Eye Movements

Ocular Motility Assessment in the Clinic

Clinical Treatment for Primary Eye Motility Disorders

Acknowledgments

Further Reading

Extraocular Muscles: Proprioception and Proprioceptors

Glossary

Proprioception

Muscle Spindles

Occurrence, Distribution, and Number of Muscle Spindles

Structure of Muscle Spindles

Function of Muscle Spindles

Golgi Tendon Organs

Occurrence, Distribution, and Number of Golgi Tendon Organs

Structure of Golgi Tendon Organs

Function of Golgi Tendon Organs

Palisade Endings

Occurrence, Distribution, and Number of Palisade Endings

Structure of Palisade Endings

Molecular Characteristics of Palisade Endings

Function of Palisade Endings

Further Reading

Eye-Field Transcription Factors

Glossary

Discovery and Structural Features of Eye- Field Transcription Factors

Pax6

Six3

Six6

Rax

Lhx2

Tbx3

Nr2e1

The EFTFs are Expressed during and are Required for Normal Eye Formation

The EFTFs Form a Self-Sustaining Feedback Network

The Coordinated Expression of EFTFs is Sufficient for Eye Formation

Conclusions

Further Reading

Eyelid Anatomy and the Pathophysiology of Blinking

Glossary

Organization of the Eyelid System

Modifiability of the Blink System

Benign Essential Blepharospasm and Hemifacial Spasm

Further Reading

F

The Fibrillar Extracellular Matrix of the Trabecular Meshwork

Glossary

Introduction

Collagen: Structure and Localization

Fibronectin: Structure and Localization

Factors that Affect Collagen and Fibronectin Expression and Assembly into the ECM

Collagen and Fibronectin Receptors

Summary and Future Perspectives

Further Reading

Fish Retinomotor Movements*

Glossary

Nature and Occurrence

Mechanisms of Force Production for Retinomotor Movements

Force Production for Photoreceptor Elongation and Contraction

The RPE Cytoskeleton and Force Production for Pigment Granule Dispersion and Aggregation

Intracellular Regulation of Retinomotor Movements: The Role of Cyclic Adenosine Monophosphate

Regulation of Photoreceptor Retinomotor Movements by Paracrine Messenger

Dopamine

Adenosine

Regulation of Retinomotor Movements in RPE Cells by Paracrine Messengers

Functions and Significance of Retinomotor Movements

Summary

Further Reading

Formation and Regression of the Primary Vitreous and Hyaloid Vascular System

Glossary

The Anatomy of the Temporary Ocular Vessels

Development of the Hyaloid Vessels

Development of the TVL and PM Is Dependent on VEGF Signaling

Regression of the Temporary Ocular Vessels Is Macrophage Dependent

The Wnt Signaling Pathway

Wnt7b Is a Macrophage Ligand Critical for Hyaloid Vessel Regression

The Angiopoietin and Wnt Pathways Integrate to Regulate Hyaloid Regression

Fzd4 and Norrin in Hyaloid Regression

Collagen 18 and Endostatin in Hyaloid Regression

The Arf Tumor Suppressor and PHPV

Future Directions

Further Reading

Functional Morphology of the Trabecular Meshwork*

Glossary

Introduction

The TM Outflow Pathways

The Trabecular Lamellae

The Juxtacanalicular Tissue

Schlemm's Canal

Contractile Influence on Trabecular Outflow

Acknowledgments

Further Reading

Fundamentals of Stereopsis

Glossary

Defining Stereopsis

Stereograms and Binocular Viewing

Classic Stereograms

Random-Dot Stereograms

The Empirical Study of Stereopsis: Thresholds and Upper Limits

Stereoacuity

Contrast

Spatial frequency/size

Modulation frequency

Duration

Configuration

Stereopsis at Large Disparities

Spatial frequency/size

Duration

Similarity

The Mechanisms of Fine and Coarse Disparity Processing

The Depth of Moving Objects

The Neural Basis of Stereopsis

Nonhuman Animal Studies

Brain Imaging in Humans

Conclusion

Further Reading

G

GABA Receptors in the Retina

Glossary

Introduction

Vesicular Transporters

Plasma Membrane Transporters

Neuronal Localization

Function

Synaptic Receptors

Photoreceptors

Horizontal Cells

Bipolar Cells

Amacrine Cells and Ganglion Cells

Muumlller's Cells

Further Reading

Ganglion Cell Development: Early Steps/Fate

Glossary

Retinal Ganglion Cell Formation

Atoh7/Ath5 Function is Critical for RGC Development

Integrated Regulation of Atoh7/Ath5 Retinal Expression

Atoh7/Ath5 Activates Pou4f/Brn3 Expression in RGCs

Pou4f2/Brn3b Controls Numerous RGC Processes

Islet1 Acts Parallel to Pou4f2 During RGC Development

Conclusion

Further Reading

Gene Therapy for the Cornea, Conjunctiva, and Lacrimal Gland

Glossary

Introduction

Corneal Gene Therapy Methods

Viral Vectors

Nonviral Vectors

Use of Gene Therapy to Treat Corneal Diseases

Corneal Graft Rejection

Corneal Wound Healing

Corneal Alkali Burn

Corneal Scarring or Haze

Corneal Neovascularization

Corneal Dystrophies

Other Corneal Disorders

Lacrimal Gland Gene Therapy

Conjunctiva Gene Therapy

Acknowledgments

Further Reading

Genetic Dissection of Invertebrate Phototransduction

Glossary

The Drosophila Phototransduction Cascade

Genetic Screens for Mutants Defective in Phototransduction Proteins

The Photochemical Cycle and the Mechanism Underlying Termination of M Activity

Coupling of Photoexcited R to Inositol Phospholipid Hydrolysis

Light-Activated Gq Protein

Light-Activated PLC

The TRP Channels

The trp Mutant and the Discovery of the TRP Channel

Biophysical Properties of the TRP Channel

Lipids Activate the Light-Sensitive Channels in the Dark

Organization in a Supramolecular Signaling Complex via the Scaffold Protein Inactivation No Afterpotential D

The Photoreceptor Cells Are Sensitive to Single Photons

Conclusions

Further Reading

Genetics of Age-Related Cataract

Glossary

Introduction

Age-Related Cataract Phenotypes

Genetic Epidemiology of Age-Related Cataracts

Genes Associated with Age-Related Cataract

Summary and Future Prospects

Acknowledgments

Further Reading

Genetics of Congenital Cataract

Glossary

Introduction

Definition

Overview

Genetic Causes of Congenital Cataract

Isolated Congenital Cataract

Phenotype-Genotype Correlations

Specific Genes Implicated in Congenital Cataracts

alpha-Crystallins

betagamma-Crystallins

Feritin Light Chain

Connexins

Membrane Proteins

Beaded Filament-Specific Proteins

Transcription Factors

Enzymes

Current State of Knowledge and Future

Further Reading

The Genetics of Primary Open-Angle Glaucoma: A Review*

Glossary

Introduction

POAG as a Complex Inherited Disorder

Genetic Approaches to Gene Identification

Chromosomal Loci for POAG

Myocilin

Optineurin

WDR36 (WD40-Repeat 36)

Gene Variants Associated with POAG

POAG Genetics and the Future

Further Reading

Glutamate Receptors in Retina

Glossary

Glutamate Pathways

Glutamate Receptor Pharmacology

Glutamate Receptors in Distal Retina

The ON Bipolar Cell Metabotropic Glutamate Receptor

The OFF Bipolar Cell AMPA and Kainate Receptors

Glutamatergic Feedback to Photoreceptors

Modulation of Glutamate Receptors

Glutamate Receptors in Inner Retina

The Mystery of the NMDA Receptors

Glutamate Receptor Diversity at the Synapse

Calcium-Permeable AMPA Receptors

Receptor Desensitization

Pre- and Postsynaptic Metabotropic Glutamate Receptors

Further Reading

H

Hemangiogenesis versus Lymphangiogenesis

Glossary

Hemangiogenesis

Overview

Angioblasts

Vasculogenesis

Angiogenesis

Lymphangiogenesis

Structure and Function of the Lymphatic System

Short Historical Perspective on Studying the Lymphatic System

Lymphangiogenesis in Development

Corneal Lymphangiogenesis

Summary

Acknowledgments

Further Reading

Hereditary Vitreoretinopathies

Glossary

Introduction

Classification of the Hereditary Vitreoretinopathies

Clinical Features of the Hereditary Vitreoretinopathies

Vitreoretinopathies Associated with Skeletal Abnormalities

Stickler syndrome (OMIM #108300, #604841, and #184840)

Kniest dysplasia (OMIM #156550)

Spondyloepiphyseal dysplasia congenital (OMIM #183900)

Marshall syndrome (OMIM #154780)

Knobloch syndrome (OMIM #267750)

Marfan syndrome (OMIM #154700)

Vitreoretinopathies Associated with Progressive Retinal Dysfunction

Wagner syndrome (OMIM #143200)

Goldmann-Favre syndrome/enhanced S-cone dystrophy (OMIM #268100)

Vitreoretinopathies Associated with Abnormal Retinal Vasculature

Familial exudative vitreoretinopathy (OMIM #133780, #601813, and #305390)

Autosomal dominant vitreochoroidopathy (OMIM #193220)

Vitreoretinopathy Associated with Corneal Changes

Snowflake vitreoretinal degeneration (OMIM #193230)

Molecular Genetics of the Hereditary Vitreoretinopathies

Further Reading

Histogenesis, Cell Fate, and Signaling Factors

Glossary

Introduction

Notch

The Wnt Pathway

The Hedgehog Signaling Pathway

Transforming Growth Factor-beta

Signaling Molecules and Photoreceptor Development

Conclusion

Further Reading

Hyalocytes

Glossary

Existence and Distribution of Hyalocytes

Morphological Characteristics of Hyalocytes

Origin of Hyalocytes

Role of Hyalocytes During Development

Role of Hyalocytes Under Physiological Conditions

Functional Properties of Hyalocytes in Vitreoretinal Interface Diseases

Proliferative Diabetic Retinopathy and Proliferative Vitreoretinopathy

Formation of proliferative membranes

Cicatricial contraction of the proliferative membrane

Idiopathic Epiretinal Membrane and Macular Hole

Conclusion and Perspective

Further Reading

Hyperopia

Glossary

Definition and Classifications of Hyperopia

Prevalence

Normal Time Course of Hyperopia

Clinical Presentations of Hyperopia

Risks of Uncorrected Hyperopia

Importance of Early Detection of Significant Hyperopia

Examination Techniques of Hyperopia

Management of Hyperopia

Conclusion

Further Reading

I

Imaging of the Cornea

Glossary

Slit-Lamp Biomicroscopy

Specular Microscopy

Confocal Microscopy

Ultrasound Biomicroscopy

Anterior Segment Optical Coherence Tomography

Acknowledgments

Further Reading

Imaging of the Orbit

Glossary

Computed Tomography

Magnetic Resonance Imaging

Angiography

Further Reading

Immunobiology of Acanthamoeba Keratitis

Glossary

Introduction

Anatomical and Physiological Barriers to Corneal Infections with Acanthamoeba

Innate Immune System and Resistance to Acanthamoeba Infections

Role of Macrophages in the Resistance to Acanthamoeba Infections

Role of Neutrophils in the Resistance to Acanthamoeba Infections

Humoral Factors of the Innate Immune System that Affect Resistance to Acanthamoeba Infections

Adaptive Immune System and Resistance to Acanthamoeba Infections

Role of the Mucosal Immune System in Resistance to AK

Evading the Adaptive Immune Response

Anti-Disease Vaccine for AK

Conclusions

Further Reading

Immunobiology of Age-Related Macular Degeneration

Glossary

Epidemiology and Clinical Findings of Age-Related Macular Degeneration

The Immune System in AMD

Histopathology of Drusen

Role of Macrophages

Adaptive Immune System

Infectious Agents

Genetics of AMD and Evidence for a Role of Inflammation in the Pathogenesis of AMD

Mouse Models of AMD

Summary

Further Reading

Immunobiology of Uveal Melanoma

Glossary

Introduction

Survival

Anti-Tumor Immune Responses

T-Cell Immunity

Antigen Expression

Effect of HLA Expression on the Progression of Uveal Melanomas

NK Cells

Immune Escape Mechanisms

Indoleamine 2,3 Dioxygenase

Programmed Death-1 Ligand

Complement Regulatory Proteins

Resistance to Perforin-Mediated Cytolysis

Overcoming the Immune Privilege of Uveal Melanomas

Conclusion

Further Reading

The Immunological Aspects of Aqueous Humor Turnover

Glossary

Aqueous Humor and the Immune Privilege of the Eye

The AqH Combines Immune Modulation and Angiogenic Privilege

Thrombospondin

alpha-Melanocyte Stimulating Hormone

Vasoactive Intestinal Polypeptide

Transforming Growth Factor beta

Calcitonin Gene-Related peptide

Further Reading

Immunopathogenesis of Experimental Uveitic Diseases

Glossary

Uveitis: The Disease and Its Experimental Models

Central Tolerance: Retina-Specific Antigens and the Thymus

Peripheral Tolerance and the Double-Edged Sword of Immune Privilege

Effector T Cells in Uveitis: Activation and Activity

Regulatory T Cells and Uveitis

Non-Treg Cells in Regulation of Uveitis

Further Reading

Immunopathogenesis of HSV Keratitis

Glossary

Natural History of Herpes Stromal Keratitis

Eradication of Replicating HSV-1 from the Corneal Epithelium

HSV-1 Colonization of Sensory Ganglia

Herpes Stromal Keratitis

T Cells in HSK

Cytokines and Their Role in HSK

Antigen-Presenting Cells in HSK

Chemokine Involvement in HSK

Angiogenesis in HSV-1 Stromal Keratitis

Models of HSK Pathogenesis

Epidemiology and Pathogenesis of Human HSK

Management of Human HSV Stromal Keratitis and Implications on Pathogenesis

Acknowledgments

Further Reading

Immunopathogenesis of Onchocerciasis (River Blindness)

Glossary

The Role of Endosymbiotic Wolbachia Bacteria in Onchocerciasis

Role of Wolbachia in Pathogenesis - Evidence from Infected Individuals

The Role of Wolbachia in the Pathogenesis of ocular onchocerciasis - Lessons from the Murine Model of O. volvulus/Wolbach

Wolbachia and TLRs in the Cornea

Identification of a Wolbachia TLR2/TLR6 Ligand

Conclusion

Acknowledgments

Further Reading

Immunopathogenesis of Pseudomonas Keratitis

Glossary

Introduction

PMN, Cytokines, and Chemokines

T Cells and IL-12

IL-18 and IFN-gamma

IFN-gamma and SP

Neuropeptides

SP

VIP

TLR

Apoptosis

Neuropeptides

New Animal Model

Further Reading

Immunosuppressive and Anti-Inflammatory Molecules that Maintain Immune Privilege of the Eye

Glossary

Immunosuppression and Anti- Inflammatory Activity in Aqueous Humor

The Immunoregulatory and Immunosuppressive Factors of The Immune-Privileged Eye

Transforming Growth Factor-Beta

Alpha-Melanocyte-Stimulating Hormone

Other Neuropeptides

Other Molecules

Application of the Lessons of Immune Privilege

Conclusion

Further Reading

Inflammation of the Conjunctiva

Glossary

Inflammation

The Conjunctiva and Cornea

Tear Fluid: A Reservoir of Inflammatory Cells and Modulators

Allergic Reactions in the Conjunctiva

Infection of the Conjunctiva or Cornea

Tear Fluid as a Diagnostic Indicator of Inflammation

Connection of the Conjunctiva and Cornea via Tear Fluid

Further Reading

Information Processing: Amacrine Cells

Glossary

Amacrine Cells

AC Classification, Form, and Patterns

AC Synapses and Neurochemistry

ACs and Signal-Processing Fundamentals

Examples of AC Networks

gamma ACs of the Rod Pathway

Gly ACs of the Rod Pathway

Small gamma ACs of the Primate Midget BC rarr GC Pathway

gamma ACs of the Directionally Selective GC pathway

Axonal Cells

ACs and Disease

Further Reading

Information Processing: Bipolar Cells

Glossary

Acknowledgments

Further Reading

Information Processing: Contrast Sensitivity

Glossary

Contrast Processing and Adaptation

The Spatial Receptive Field

The Temporal Receptive Field

Receptive Field Properties Explain Contrast Sensitivity Functions

Disrupting Specific Retinal Pathways Alters Perceptual Contrast Sensitivity in Selective Ways

Physical Limits to Contrast Sensitivity

Further Reading

Information Processing: Direction Sensitivity

Glossary

Physiological Functions of DSGCs

Synaptic Circuitry of DSGCs

Direction-Selective Responses in SAC Processes

Integration of Multiple Cooperative Mechanisms for Direction Selectivity

Concluding Remarks

Acknowledgments

Further Reading

Information Processing: Ganglion Cells

Glossary

Ganglion Cell Types

Principles of Ganglion Cell Processing

Temporal Processing

Spatial Processing

Center-Surround Receptive Fields

Tiling

Stimulus Features that Trigger Ganglion Cell Activity

Ganglion Cells as Spatiotemporal Filters

Ganglion Cells as Specific Feature Detectors

Direction-selective (DS) ganglion cells

Object motion sensitive (OMS) ganglion cells

Saccadic suppression

Approach-sensitive ganglion cells

Further Reading

Information Processing: Horizontal Cells

Glossary

Introduction

Synaptic Interactions and Gap-Junction Coupling of Horizontal Cell Subclasses

Ionic Conductances of Horizontal Cells and the Response to Light

Cellular Mechanisms of Horizontal Cell Neurotransmission

Horizontal Cell Feedback and Feed-Forward

Feed-Forward onto Bipolar Cell Dendrites

Feedback onto Photoreceptor Terminals

Ephaptic Transmission between Horizontal Cells and Photoreceptor Terminals

Proton Mediation of Horizontal Cell Feedback

Functional Roles of Horizontal Cells

Retinal Adaptation

Gain Control of Synapses in the Outer Retina

Spatial and Temporal Processing

Chromatic Processing

Conclusions

Acknowledgments

Further Reading

Information Processing in the Retina

Glossary

Introduction

The Outer Retina, Gain and Level Adjustment

Bifurcation of the Visual Pathways into ON and OFF streams

Horizontal Cell Synaptic Interactions

Horizontal Cells and Local Gain Control

Interactions at the Inner Retina: Contrast Gain

General Organizational Principles

Lateral Interactions are Concatenated

Mutual Antagonism is a Form of Amplification

Redundant Feedforward and Feedback Interactions

Interaction between the Two Complementary Visual Streams in the Visual System

Inner Retinal Processing: Circuitry for Feature Extraction

Amacrine Cell Morphological Types

Specific Ganglion Cell Circuitries

Directional selectivity

Functions of AII Amacrine Cells

Further Reading

Information Processing: Retinal Adaptation

Glossary

Light Adaptation

Characteristics of Light Adaptation

Mechanisms and Sites of Light Adaptation

Contrast Adaptation

Chromatic Adaptation

Dark Adaptation

Characteristics of Dark Adaptation

Mechanisms of Dark Adaptation

Conclusion

Further Reading

Inherited Optic Neuropathies

Glossary

Leber's Hereditary Optic Neuropathy

Dominant Optic Atrophy (DOA)

Recessive Optic Atrophy

Other Inherited Conditions with Optic Atrophy

Conclusion

Further Reading

Injury and Repair: Light Damage

Glossary

Introduction

Role of Rhodopsin Activation in Light Damage

Mechanisms of Photic Injury: From Gene Expression to the Molecular Pathway

Apoptosis Genes

Role of Oxidant Stress in Light Damage

Role of Inflammation in Light Damage

Tissue Remodeling

Transcription Factors

Identification of Two Nonredundant Mechanisms of Endogenous Protection of Photoreceptors

Rhodopsin-Activated Endogenous Protection

Identification of Mechanisms for Chronic Light Stress-Induced Endogenous Protection

Role of Leukemia Inhibitory Factor

Concluding Remarks

Further Reading

Injury and Repair: Neovascularization

Glossary

Introduction

Mechanisms of Injury

Animal Models of NV after Laser- Induced Injury

Acute Responses to Retinal Injury

Blood-Retina Barrier Breakdown

Acute Release of Cytokines

Injury-Induced Complement Activation

Other Angiogenic Mediators in the Retinal Response to Injury

Modulation of the Extracellular Matrix

Cellular Response in Injury-Induced NV

Neutrophils

Macrophages

Progenitor/Stem Cells

Other Infiltrating Cell Types

Resident Tissue Cells

Microglia

Retinal astrocytes

Muumlller cells

Cellular Responses to VEGF-A Receptor Binding

Conclusion

Further Reading

Injury and Repair: Prostheses

Glossary

Rationale for a Prosthetic Device

Brain Prosthetic Devices

Retinal Prosthetic Devices

Clinical Trials

Challenges

Future Prospects

Further Reading

Injury and Repair: Retinal Remodeling

Glossary

Overview

Progression

Phase 1

Phase 2

Phase 2+

Phase 3

Remodeling Events

Reprogramming

Rewiring

Neuritogenesis

Synaptogenesis and Microneuromas

Self-Signaling

Migration

Cell Death

MC Remodeling

RPE Remodeling

Vascular Remodeling

Impact of Remodeling on Therapeutics

Primary Gene Therapy

Survival Factor Therapy

Stem/Neuroprogenitor Cell Therapy

Retinal Transplantation

Secondary Gene Therapies: Photosensitive Proteins

Bionic Implants

The Importance of Cone Rescue

Further Reading

Injury and Repair: Stem Cells and Transplantation

Glossary

Introduction

Early Transplant Work

Neural Progenitor Cells

Retinal Progenitor Cells

Induced Pluripotent Stem Cells

Stem Cells for Neuroprotection

Retinal Transplantation

Transplantation Strategies

Polymer Substrates

Inhibitory Barriers

Conclusions

Further Reading

Injury and Repair Responses: Retinal Detachment

Glossary

Injury to the Retina

Introduction

Retinal glial cells

Retinal injury and retinal detachment: A close relationship

What is an RD

Symptoms and signs of RD in people

Brief history

Cellular Responses of the Retina to Injury

General Events

Muumlller's cells

Muumlller's cells and RD: Glial scarring

Injury and Other Cell Types

Photoreceptors

Second- and Third-Order Neurons

Microglia and the Immune Response

Retinal Pigmented Epithelial cells

Summary

Further Reading

Innate Immune System and the Eye

Glossary

Introduction

Passive Innate Defense System

Anatomic and Physical Barriers

Eyelids and eyelashes

Tear film

Corneal epithelium

Posterior lens capsule

Retinal pigment epithelium

Chemical Barriers

Lysozyme

Secretory phospholipase A2

Cathelicidin (LL-37)

Defensins

Lactoferrin

Lipocalin-A

Secretory IgA

Complement

Active Innate Defense System

Pattern Recognition Receptors

Toll-like receptors

NOD-like receptors

Complement

Cytokines, Chemokines, and Effector Cells

Initiation and amplification

Clearing the pathogen

Innate Immune Privilege

Link between Innate and Adaptive Immunity

Conclusion

Further Reading

Innate Immunity and Angiogenesis

Glossary

Innate Immunity and Wound Healing

TLRs and Angiogenesis

HIF-1alpha: At the Intersection of Angiogenesis and Innate Immunity

Summary

Further Reading

Intraocular Pressure and Damage of Optic Nerve Axons

Glossary

Introduction - Intraocular Pressure as a Risk Factor for Glaucoma

Biomechanical Engineering Studies

Modulation of Glia Behavior at the Optic Nerve Head and Dysfunction of Ganglion Cell Axons

Compartmentalized Self-Destruct Pathways and the Pathology of Glaucoma

Acknowledgments

Further Reading

Intraretinal Circuit Formation

Introduction

Organization of Retinal Circuits of Vertebrates

Formation of Retinal Synaptic Laminae

Assembly of the Vertical Pathway

Retinal Ganglion Cells

Bipolar Cells

Photoreceptors

Synaptogenesis in the Vertical Pathway

Assembly of Lateral Circuits

Inner Retina - Amacrine Cells

Outer Retina - Horizontal Cells

Emergence of Function - Spontaneous and Light-Evoked Activity

Conclusions

Further Reading

Ion Transport in the Ciliary Epithelium

Glossary

Introduction

Aqueous Humor Production: Active Transport

The Ciliary Epithelium: A Double-Layered Epithelium Forms a Functional Syncytium

The Energy for Active Transport

The Transport Mechanisms

The Uptake of Ions at the Basolateral Membrane of the Pigmented Epithelium

The Transport from the Pigmented Epithelium to the Nonpigmented Epithelium

The Efflux of Ions across the Basolateral Membrane of the Nonpigmented Epithelium

Aquaporins of the Ciliary Epithelium

Regulation of Aqueous Humor Formation

Regulation of Na+ and Cl- Uptake by the Pigmented Epithelium

Modulation of Cl- Efflux out of the Nonpigmented Epithelium

The Regulation of the Aqueous Humor Formation at the Double-Layered Epithelium

The Transport of HCO3--

Further Reading

Ionic Permeability and Currents in the Lens

Glossary

The Physiology of Lens Transparency: A Unique Structure and Function

Early Views of Lens Physiology

The Lens Internal Circulation System

Key Membrane Transport Components of the Lens Circulation System

Localization of Active Transport Mechanisms to the Lens Surface

Spatially Differences in Membrane Permeability

Directing Gap Junctional Coupling to the Equator

Water Permeability and Fluid Flow

Secondary Active Transport of Nutrients

Steady-State Volume Regulation: Balancing Ion Influx and Efflux

Further Reading

Ischemic Optic Neuropathy

Glossary

Classification

Nonarteritic Anterior Ischemic Optic Neuropathy

Pathogenesis

Risk Factors for Development of NA-AION

Conclusion

Clinical Features of NA-AION

Bilateral NA-AION

Recurrence of NA-AION in the same eye

NA-AION and phosphodiesterase-5 inhibitors

Amiodarone and NA-AION

Familial NA-AION

Management of NA-AION

Incipient NA-ION

Arteritic AION

Pathogenesis

Clinical Features of GCA and A-AION

Symptoms

Signs

Laboratory investigations

Management of A-AION

Differentiation of A-AION from NA-AION

Steroid Therapy to Prevent Blindness in GCA

Conclusion

Posterior Ischemic Optic Neuropathy

Classification

Pathogenesis

Arteritic PION

Nonarteritic PION

Surgical PION

Clinical Features of PION

Symptoms

Signs

Management of PION

Arteritic PION

Nonarteritic PION

Surgical PION

Conclusions

Further Reading

K

Knock-Out Mice Models: Cornea, Conjunctiva, Eyelids and Lacrimal Gland

Glossary

Introduction

Transgenesis

Gene Targeting

Tissue-specific gene ablation using Cre-LoxP system

Pitfalls of Cre-LoxP system: Cryptic Cre expression by germ cells during gametogenesis

Inducible Cre-LoxP system

Strategies of Cornea-Specific Genetic Modification: Transgenic and Knock-Out/Knock-In Mice

Identification of Ocular-Surface Tissue-Specific Promoter

Stromal keratocyte-specific promoter

Corneal-epithelium-specific promoter

Ocular-surface epithelium-specific Pax6 promoter (Pax6OS)

Ocular Surface Tissue-Specific Driver Mouse Lines

Corneal stroma-specific mouse lines

Corneal-epithelium-specific mouse lines

Ocular surface tissue-specific Pax6OS-rtTA mouse line

Roles of Growth Factors on Ocular Surface Tissue Morphogenesis during Development and Wound Healing Elucidated from Transgenic

TGFbeta Receptor Signaling Pathways during Development and Corneal Wound Healing

Role of TGFbeta2 on development

Role of TGF-beta signaling in wound healing of corneal epithelium

Role of FGF7 in Maintenance of Corneal Homeostasis

EGFR/EGF, TGFalpha Signaling Pathways on Eyelids Morphogenesis

Conclusion: The Clinical Relevance of Tet-ON Mouse Models in Elucidating Pathophysiology of Ocular Surfaces Diseases

Acknowledgments

Further Reading

L

Lacrimal Gland Hormone Regulation

Glossary

Gender-Related Dimorphisms

Sex Steroids

Androgens

Estradiol and Progesterone

Prolactin

Exocrine Products and Autocrine/ Intracrine and Paracrine Mediators

Influences of Prolactin, Estradiol, and Progesterone during Pregnancy

Reproductive Hormone Influences on Other Mucosal Immune System Tissues

Counterpoises between Contradictory Signals

Further Reading

Lacrimal Gland Overview

Glossary

Anatomy of the Main Lacrimal Gland

Cell Types within the Lacrimal Gland

Acinar Cells

Ductal Cells

Myoepithelial Cells

Bone-marrow-derived Cell Population

Innervation of the Lacrimal Gland

Blood Supply

Contents of Lacrimal Fluid

Mechanisms of Protein Secretion in the Lacrimal Gland

Mechanisms and Regulation of Electrolyte and Water Secretion by the Lacrimal Gland

Acinar Cells

Ductal Cells

Conclusion

Further Reading

Lacrimal Gland Signaling: Neural

Glossary

Anatomy of the Lacrimal Gland

Neural Control of Lacrimal Gland Secretion

Signal Transduction Pathways Activated in the Lacrimal Gland

Cholinergic Agonist-Activated Signal Transduction Pathways

PLC-coupled signaling pathway

PLD-coupled signaling pathway

MAPK-coupled signaling pathway

VIP-Activated Signal Transduction Pathways

Adenylate cyclase-coupled signaling pathway

MAPK-coupled signaling pathway

alpha1-Adrenergic Agonist-Activated Signal Transduction Pathways

Ca2+- and PKC-coupled signaling pathways

MAPK-coupled signaling pathway

NO-coupled signaling pathway

Further Reading

Lens Determination and Induction

Glossary

Introduction

The Lens Is One Type of Light-Focusing Structure

Lens Induction: An Auspicious Beginning

The Developmental Biology of Lens Formation

The Lens Undergoes Complex Morphogenesis

Is There a Common Placodal Precursor Domain

Genetic Regulation of Lens Development

Transcription Factors

Signaling Pathways Involved in Lens Induction and Development

Bone Morphogenetic Protein

Fibroblast Growth Factor

Wnt

Notch

Concluding Comments

Further Reading

Lens Fiber Cell Differentiation

Glossary

Primary Fiber Cell Differentiation

The Lens is a Stratified Epithelium

Secondary Fiber Cell Differentiation

Cell-Cycle Withdrawal

Fiber Cell Elongation

Crystallin Synthesis

Fiber Cell Membranes

Fiber Cell Cytoskeleton

Organelle Elimination

Experimental Approaches to Study Lens Fiber Cell Differentiation

Regulation of Fiber Cell Differentiation

Transcription Factors

Growth Factors

Notch Signaling

Conclusion

Further Reading

Lens Gap Junctions

Glossary

Lens Structure and Importance of Intercellular Communication for Lens Function

Structure and Components of Gap Junctions

Distribution of Connexins within the Lens

Physiology and Pharmacology of Gap Junction-Mediated Intercellular Communication

Connexin Functions beyond Intercellular Communication

Regulation of Connexin Functions by Protein Modification

Phosphorylation

Cleavage/Proteolysis

Connexins and Lens Pathologies

Cataracts in Mice with Genetically Manipulated Connexin Levels

Cataracts due to Connexin Mutations

Cataract-Causing Insults and Damage to Lens Connexins

Further Reading

Lens Regeneration

Glossary

A General Background of Lens Regeneration

The Process of Transdifferentiation and Lens Regeneration

Gene Expression and Induction of Lens Regeneration

Gene Regulation in the Induction of Lens Regeneration

Large-Scale Expression Studies

Microarray Analysis

MicroRNA Regulation During Lens Regeneration

Comparison with the Axolotl

Further Reading

Lens Structure

Glossary

Refractive Index

Transparency

The Zonules

Further Reading

Lids: Anatomy, Pathophysiology, Mucocutaneous Junction

Glossary

Anatomy

Pathophysiology

Dermatochalasis

Ptosis

Retraction

Entropion

Trichiasis

Distichiasis

Ectropion

Floppy Lid Syndrome

Common Malignant Eyelid Tumors

Benign Eyelid Tumors

Inflammatory and Infectious Disorders of the Lids

Further Reading

Light-Driven Translocation of Signaling Proteins in Vertebrate Photoreceptors

Glossary

Introduction

Light Dependency of Protein Translocation

Hypotheses on the Functional Roles of Protein Translocation

What Is the Mode of Protein Translocation: Active Transport or Diffusion

Specific Mechanisms of Protein Translocation

Transducin

Arrestin

Proteins' Return in the Dark

Further Reading

Limulus Eyes and Their Circadian Regulation

Glossary

Organization of the Limulus Visual System

Lateral Compound Eyes

Median Eyes

Rudimentary Eyes

The Photoreceptors

Circadian Organization of the Limulus Visual System

Effects of the Clock on Limulus Eyes

Structure

Physiology

Rhabdom Shedding

Gene Expression

Biochemical Processes Mediating Clock Effects on Limulus Eyes

Octopamine and the Activation of a cAMP Cascade

Clock-Driven Protein Phosphorylation

Conclusion

Further Reading

e9780123741981v3

Front Cover

Encyclopedia of the Eye

Copyright Page

Contributors

Editors Biographies

Editors Affiliations

Preface

Foreword

Subject Classification

Guide to use of the Encyclopedia

Contents

VOLUME 3

M

Macular Edema

Glossary

Diagnosis of Macular Edema

Anatomy of the Macula

Clinical Findings in Macular Edema

Clinically Significant Diabetic Macular Edema

Findings by Fluorescein Angiography

Causes of Macular Edema

Treatment of Macular Edema

Results from the ETDRS

Results of Other Clinical Trials

Anti-VEGF Therapies and Macular Edema

A Puzzling Question

Further Reading

Meibomian Glands and Lipid Layer

Glossary

Overview

The Lipid Layer of the Tear Film

Meibomian Glands

Anatomy and Histology

Development

Composition of Meibomian Lipids

Meibomian Lipid Turnover and Synthesis

Pathology of the Meibomian Gland

Chronic Blepharitis

Chalazion

Surgical Damage

Contact Lenses and the Lipid Layer

Further Reading

Microvillar and Ciliary Photoreceptors in Molluskan Eyes

Glossary

Microvillar (Rhabdomeric) Photoreceptors

Excitation

Light Adaptation

Ciliary Photoreceptors

Excitation

Photopigment, G Protein, and Arrestin

Guanylate Cyclase

Light-Dependent Ion Channels

Light Adaptation

Further Reading

Molecular and Cellular Mechanisms in Allergic Conjunctivitis

Glossary

Ocular Allergies

Seasonal Allergic Conjunctivitis

Perennial Allergic Conjunctivitis

Vernal Keratoconjunctivitis

Atopic Keratoconjunctivitis

Cellular Mechanisms in Ocular Allergy

Conjunctival MCs

Conjunctival Eosinophils and Neutrophils

Conjunctival Lymphocytes

Conjunctival Epithelial Cells

Conjunctival Fibroblasts

Molecular Mechanisms

Costimulatory Molecules in Ocular Allergy

IgE in ocular allergy

Cytokines and Chemokines in Ocular Allergy

Further Reading

Molecular Composition of the Vitreous and Aging Changes

Glossary

Introduction

Molecular Composition of the Vitreous

Extracellular Matrix

Vitreous Collagens

Type II collagen

Type V/XI collagen

Type IX collagen

Synthesis of vitreous collagen

NC Proteins and Glycoproteins

Opticin

Other proteins and glycoproteins

GAGs and Proteoglycans

Hyaluronan

Chondroitin sulfate proteoglycans

Heparan sulfate proteoglycans

Supramolecular Organization of the Vitreous

Aging Changes that Predispose to PVD

Age-Related Vitreous Liquefaction

Weakening of the Vitreoretinal Adhesion

Conclusions

Further Reading

Molecular Genetics of Congenital and Juvenile Glaucoma

Glossary

Definition of Glaucoma

Major Subtypes of Glaucoma

Prevalence and Clinical Features of JOAG and CG

Molecular Genetics of JOAG: Mapped Loci and Identified Candidates

Myocilin (MYOC) as a Primary Candidate for JOAG

Overview

Analysis of Mutations and Polymorphisms Associated with JOAG in MYOC

Molecular Genetics of CG: Mapped Loci and Identified Candidates

Cytochrome P450 1B1 (CYP1B1) as a Primary Candidate for CG

Overview

Analysis of Mutations Associated with CG in CYP1B1

Genetic Overlap between CG and Juvenile Glaucoma (JOAG)

Involvement of CYP1B1 in JOAG

Involvement of MYOC in CG

Digenic Inheritance in Glaucoma

Developmental Anomalies and Glaucoma

Future Directions

Further Reading

Molecular Mechanisms of Angiostasis

Glossary

Introduction

Physiological and Biological Functions of Type IV Collagen

Generation of Angiostatic Domains from Type IV Collagen and Their Signaling Mechanisms

Different Integrins Mediated Angiostatic Signaling by Tumstatin

Different Integrins Mediated Angiostatic Signaling by Canstatin

Distinct Integrin-Mediated Angiostatic Signaling by Arresten

Distinct Integrin-Mediated Angiostatic Signaling by alpha6(IV)NC1

Conclusions and Perspectives

Acknowledgments

Further Reading

Morphology of Interneurons: Amacrine Cells

Glossary

AII Amacrine Cells

Starburst Amacrines

Further Reading

Morphology of Interneurons: Bipolar Cells

Glossary

Introduction

Bipolar Cell Types of the Mammalian Retina

Midget Bipolar Cells of the Primate Retina

Blue Cone Bipolar Cells

Clomeleon-labeled ganglion cells, amacrine cells and bipolar cells

Diffuse Bipolar Cells

Cone Bipolar Cells with Rod Input

Immunocytochemical Markers and Transgenic Mouse Lines

Synaptic Contacts of Bipolar Cells in the Inner Plexiform Layer

Costratification of Pre- and Postsynaptic Partners in the Inner Plexiform Layer

Bipolar Cells of Nonmammalian Vertebrates

Color-Coded Bipolar Cells in the Turtle Retina

Morphology of Interneurons: Horizontal Cells

Glossary

General Morphology and Connectivity

Basic Morphology

Photoreceptor Contacts

Contacts with cones

Contacts with rods

Population Properties and Gap-Junctional Coupling

Diversity of Morphology and Connectivity across Species

Variations of Shape

Species with Selective Cone Contacts

Conclusions and Open Questions

Further Reading

Morphology of Interneurons: Interplexiform Cells

Glossary

Introduction

Morphology of Dopaminergic Interplexiform Neurons

Morphology and Distribution

Soma

Dendrites

Axon-like fine process

Synaptic Input to DA Neurons

Input from bipolar cells and amacrine cells

Input from intrinsically photoreceptive ganglion cells

Input from centrifugal fibers

Physiology of Dopaminergic Interplexiform Neurons

Dopamine Reconfigures Retinal Circuits

Light Drives Interplexiform Neurons via Both Conventional and Novel Pathways

IPCs Signal Time of Day from the Retinal Clock

DA Neurons and Retinal Degenerative Disease

Parkinson's Disease

Diabetic Retinopathy

Human Health Implications of the Retinal Clock

Summary

Myocilin*

Glossary

Discovery of the Glaucoma-Associated Myocilin Gene

MYOC Gene to Myocilin Protein

Myocilin Expression and Localization

Function of Myocilin

Myocilin Mutations

How Does Myocilin Cause Glaucoma

Normal Myocilin

Glaucoma-Associated Mutant Myocilin

Future Directions

Further Reading

Myopia

Glossary

Definition of Myopia: Health and Economic Implications

Natural History of Myopia

Structural Correlates, Molecular and Anatomical Changes in Myopia

Classifications of Myopia

Epidemiology of Myopia

Etiology of Myopia

Correction and Prevention: Clinical Management of Myopia

Positive Additions for Nearwork

Contact Lenses

Vision Therapy and Biofeedback Training

Pharmacological Treatment

Correction and Prevention: Clinical Management of Myopia

Further Reading

N

Neuroendocrine Properties of the Ciliary Epithelium

Glossary

The Ciliary Epithelium

Neuroendocrine Genotype of the CE

Neuropeptides and Peptide-Hormones of the CE

Potential Neuroendocrine-Immune Circuitry in the Anterior Segment of the Eye

Potential Glutamatergic and Gamma- Aminobutyric Acid (GABA) Systems in the CE

Conclusion

Further Reading

Neuropeptides: Function

Glossary

Introduction

Peptide Receptor Expression

Peptide-Binding Sites and Localization

Peptide Receptor messenger RNAs

Peptide Receptor Localization

Intracellular Signaling

Cellular Signaling

Ca2+ Imaging and Ion Channel Physiology

Functional Studies

Electroretinogram Recording

Extracellular Recordings

Peptide Influence on Transmitter Release

Peptide Function

Conclusion

Acknowledgments

Further Reading

Neuropeptides: Localization

Glossary

Introduction

Peptide Expression

Bioassays and Radioimmunoassays

Peptide Localization

Peptide Messenger RNA

Peptide Immunostaining

Peptide Receptor Expression

Peptide-Binding Sites and Localization

Peptide receptor mRNAs

Pharmacological Studies

Peptide Receptor Localization

Peptide Receptor mRNAs

Peptide Receptor Localization

Acknowledgments

Further Reading

Neurotransmitters and Receptors: Dopamine

Glossary

Localization of Dopamine Neurons in the Retina

Regulation of Dopamine Neuronal Activity

Dopamine Neuronal Activity Is Coupled to Dopamine Synthesis and Metabolism

Circadian Control of Dopamine Release and Metabolism

Dopamine Receptors

Functions of Dopamine in the Retina

Retinal Pigment Epithelium

Photoreceptor Cells

Horizontal Cells

Bipolar Cells

Amacrine Cells

Ganglion Cells

Muumlller Glial Cells

Role of Dopamine in Photopic Visual Processing

Dopamine and Circadian Organization of the Retina

Dopamine, Retinal Development, Ocular growth, and Myopia

Summary

Acknowledgments

Further Reading

Neurotransmitters and Receptors: Melatonin Receptors

Glossary

Introduction

Sites of Retinal Melatonin Synthesis

Melatonin Synthesis by Photoreceptors

Phylogenetic Relationships between Photoreceptors and Pinealocytes

Classification of Melatonin Receptors

Sites of Melatonin Receptors in the Retina

Melatonin Receptors in Photoreceptor Cells

Melatonin Receptors in RPE

Melatonin Receptors in Inner Retinal Neurons

Effects of Melatonin on Retinal Function

Modulation of Neurotransmitter Release

Modulation of Photoreceptor Function

Further Reading

Noninvasive Testing Methods: Multifocal Electrophysiology

Glossary

Why Multifocal

The Basic Principle

Recording of Multifocal Data

Multifocal Stimulators

Patient Positioning and Data Collection

Data Analysis and Presentation

Dealing with Noisy Data

How Long Does the Test Take

Some Examples from the Retina Clinic

Central Serous Retinopathy

Hydroxychloroquine Retinopathy

Juvenile X-Linked Retinoschisis

Detecting Small Central Dysfunction

Applications to Neuro-Ophthalmology and.Glaucoma

The mfVECP in Optic Neuritis

Comparison of the mfVEP and the mfERG in Optic Neuropathies and Glaucoma

Comparison of the mfVEP and the ONHC of the mfERG in an Asymmetric Glaucoma Patient

Patient with Unknown Vision Loss

Summary and Conclusion

Acknowledgments

Further Reading

Normal Age-Related Changes: Crystallin Modifications, Lens Hardening

Glossary

Introduction

Characterization of Lens Posttranslational Modifications

Summary of Early PTM Studies

Review of Identified and Localized Lens.PTMs

Deamidation

Methylation

Oxidation

Acetylation and Carbamylation

Phosphorylation

Other Lysine and Arginine Modifications

Truncation

Functional Significance of Lens PTMs

Further Reading

Nuclear Cataract

Glossary

Cortical Cataract and Nuclear Cataract

Classification

Cataract is Not the Same as Aging

Features that Distinguish ARNC from Normal Aging

Insoluble Protein

Oxidation

Cross-Linking

Coloration

Why is ARNC Age-Related

A Model for ARNC: The Lens Center is an Enzyme-Free Region

Uncoupling the Center from the Lens Cortex

Unfolding Crystallins and the Importance of Alpha Crystallin

Another Impact of the Lens Barrier

Could Sunlight Play a Role in ARNC

The Resurrection of Sunlight

What is the Primary Oxidant Involved in ARNC

Can ARNC be Prevented

Issues and Questions for the Future

Other Questions

Could Lens Components Other than Crystallins be Involved

Why Do Some People in India Develop ARNC Much Earlier than Those in Western Nations

Is ARNC Just a Problem that is Lens Specific

Conclusion

Further Reading

O

Ocular Media Clarity and Straylight

Glossary

Introduction

Straylight

History

Normal Eyes

Cataract

Cornea

Forward and Backward Scatter

CIE Standard Observer

Relation between Straylight and Other Test Outcomes

Visual Acuity

Contrast Sensitivity

Glare Sensitivity

Straylight and Slit-Lamp-Based Examination

Straylight and Patient Complaints

Frequently Asked Questions

What Are the Causes of Retinal Straylight

Normal eye

Important causes of increased retinal straylight

What is the Reliability of a Straylight Measurement

Does Pupil Size Affect the Straylight Measurement

Further Reading

Ocular Mucins

Glossary

Introduction

Mucin Architecture

Mucin Families

Surface-associated mucins

Secreted mucins

Biosynthesis and Turnover

Synthetic pathways

Glycosylation

Glycosyltransferases

Turnover

Recycling

Degradation

Control of Secretion

Individual Variation

Mucin Function

Gel Formation

Anchoring to the Ocular Surface

Physical and Chemical Barriers

Lubrication

Tear Breakup

Antimicrobial Activity

Immune Protection

Clinical Relevance and Pathology

Contact Lens Wear

Dry Eye Syndromes

Further Reading

Optical Coherence Tomography

Glossary

3D Ultrahigh Resolution Retinal OCT

3D Wide-Field Choroidal OCT

Cellular Resolution Retinal OCT

Functional Retinal Imaging Using OCT

Conclusion

Acknowledgments

Further Reading

Optic Nerve: Optic Neuritis

Glossary

Definition

Optic Nerve Anatomy

Immunopathogenesis

Epidemiology

Etiology

Symptoms

Diagnosis

Clinical Examination

Visual Evoked Potential

Magnetic Resonance Imaging

Cerebrospinal Fluid

Optical Coherence Tomography

Differential Diagnosis

Treatment

Neuroprotective Treatment Strategies

Prognosis

Further Reading

Orbital Bony Anatomy and Orbital Fractures

Glossary

The Bony Orbit

The Orbital Rim

The Medial Orbital Wall

The Orbital Roof

The Lateral Orbital Wall

The Orbital Floor

Orbital Fractures

Orbital Floor (Blowout) Fracture

Medial Wall Fractures

Zygomatic-Maxillary Complex Fractures (Tripod)

Postoperative Care

Further Reading

Orbital Masses and Tumors

Glossary

Neoplasia

Neurogenic Tumors

Optic nerve gliomas

Peripheral nerve tumors

Rare tumors of neuroectodermal origin

Mesenchymal Tumors

Striated muscle tumors

Smooth muscle tumors

Adipose tumors

Fibrous tissue tumors

Histiocytic tumors

Primary Bone Tumors

Benign fibro-osseous and cartilaginous lesions

Reactive lesions

Neoplasms

Secondary Tumors of the Orbit

Neoplasia of the sinus and nasopharynx

Orbital extension of eyelid tumors

Secondary tumors arising from the conjunctiva

Orbital extension of ocular malignancies

Orbital extension of lacrimal sac tumors

Lacrimal Gland Neoplasia

Lymphocytic Tumors

Structural Lesions

Cystic Lesions

Tumors and Ectopias

Inflammatory Diseases

Nonspecific Orbital Inflammations

Myositic inflammation

Lacrimal inflammation

Anterior and diffuse inflammation

Apical inflammation

Specific Inflammations of the Orbit

Infections - orbital cellulitis and sinusitis (microbial)

Fungal infections

Tuberculosis and syphilis

Parasitic infections

Vasculitis

Idiopathic sclerosing inflammation

Sarcoidosis

Other lesions

Vascular Lesions

Arteriovenous Malformations

Venous Malformations

Lymphatic and Combined Venous Lymphatic Malformations (Lymphangioma)

Adult Lymphangiomas

Capillary Hemangiomas

Further Reading

Orbital Soft Tissue Biomechanics

Glossary

Introduction

Geometry of the Orbital Structures

Material Properties

Eye Muscles

Orbital Fat

Sclera

Optic Nerve

Contact Behavior at the Interface between Structures

Connected Structures

Sliding at the Interface between Structures

Connective Tissue Connections

Other Interface Layers

Load Cases: Muscle Contraction, Orbital Disease, Blunt Impact, etc.

Computational Modeling

Further Reading

Orbital Vascular Anatomy

Glossary

Arterial Blood Supply

Internal Carotid Artery

Ophthalmic Artery

Intracranial

Intracanalicular

Intraorbital

Ocular Branches

Orbital Branches

Extraorbital Branches

External Carotid Artery

Venous Drainage

Cavernous Sinus

Contents of the Cavernous Sinus

Clinical Correlate: Orbital Vascular Pathology

Arterial and Venous Occlusions

Cavernous Carotid Artery Aneurysm

Carotid-Cavernous Sinus Fistula

Cavernous Sinus Thrombosis

Orbital Surgical Surface Anatomy

Dacryocystorhinostomy

Temporal Artery Biopsy

Further Reading

Overview of Electrolyte and Fluid Transport Across the Conjunctiva

Glossary

Introduction

Conjunctival Epithelium

Bioelectric Studies on the Isolated Rabbit Conjunctiva

Electrolyte Transport Systems of the Rabbit Conjunctiva

Regulation of Epithelial Ion Transport in Rabbit Conjunctiva

Fluid Transport Studies across Isolated Rabbit Conjunctiva

Further Reading

P

Pathogenesis and Immunology of Bacterial Endophthalmitis

Glossary

Classification

Exogenous Endophthalmitis

Postoperative Endophthalmitis

Bleb-Related Endophthalmitis

Post-Traumatic Endophthalmitis

Endophthalmitis Associated with Microbial Keratitis

Endogenous Endophthalmitis

Clinical Findings

Virulence Factors of Bacteria Causing Endophthalmitis

Pathogenic Mechanisms

Quorum Sensing

Biofilm Formation

Toxin Production

Virulence Factors of Main Pathogen

Staphylococci

Enterococci

Streptococci

Bacillus

Propionibacterium acnes

Gram-Negative Rods

The Host Response in Endophthalmitis

Defense against Bacteria

Toll-Like Receptors

Complement

Cellular infiltration

Proinflammatory Cytokines

Immunosuppressive Microenvironment of the Eye

Anticomplement Factors

Anterior-Chamber-Associated Immune Deviation

Conclusion

Further Reading

Pathogenesis of Fungal Keratitis

Glossary

Contact-Lens-Associated Fungal Keratitis

Biofilm Formation in Contact-Lens-Associated Keratitis

Keratitis Caused by Candida

Fungal Keratitis Associated with Trauma

Role of Matrix Metalloproteinases in Fungal Keratitis

Role of Innate Immunity in Fungal Keratitis

Murine Model of Aspergillus Keratitis

Conclusions

Acknowledgments

Further Reading

Pathogenesis of Uveitis in Humans

Glossary

Introduction

Causes of Human Uveitis

Infectious Uveitis

Viral disease

Parasitic disease

Fungal infections

Bacterial infections

Noninfectious Uveitis

Associated with systemic disease

As part of a characteristic syndrome

Behcet's disease

VKH disease

Idiopathic

Classification of Human Uveitis in the Context of Pathological Signs

Pathogenetic Mechanisms in Uveitic Disease

Tolerance and Its Dysregulation

Self-Antigens versus Foreign Antigens

Are Antigen-Specific Cells Required to Cause Damage

Cells Regulating Disease

Conclusion

Further Reading

Pathological Retinal Angiogenesis

Glossary

Introduction

Promoters and Inhibitors of Angiogenesis

Promoters of Angiogenesis

Vascular endothelial growth factor

Placental growth factor

Platelet-derived growth factor

Notch

Tumor necrosis factor-alpha

Ephrins and Ephs

Angiopoietins

Erythropoietin

Integrins

Matrix metalloproteinases

Components of the complement cascade

Inhibitors of Angiogenesis

Pigment epithelium-derived factor

VEGFxxxb isoforms

Soluble VEGF receptor 1

Complementary regulatory protein CD59

Tryptophanyl-tRNA synthase fragment

Slit/Roundabout4

Other inhibitors

New Directions in Antiangiogenic Therapy

Conclusions

Further Reading

Penetrating Keratoplasty

Glossary

Penetrating Keratoplasty: Indications and Survival

Corneal Immune Privilege

Immune-Privileged Tissue

Immune-Privileged Site

Clinical Features of Corneal Graft Rejection

Pathogenesis of Rejection

Afferent Mechanisms and Components

Histocompatibility antigens

Direct and indirect alloantigen recognition

T-lymphocyte activation

Effector Mechanisms

T lymphocytes

Macrophages

NK cells

Breakdown of immune privilege

Treatment of Rejection

Prevention of Rejection

Further Reading

Pericytes and Microvascular Remodeling: Regulation of Retinal Angiogenesis

Glossary

Overview

Retinal Microvascular Dynamics: Cell-Cell Interactions

Retinal Pericytes and Diabetes-Induced Vascular Proliferative Disorders

Pericyte Rho GTP Signaling: A Role in Pathologic Angiogenesis

Acknowledgments

Further Reading

Perimetry

Glossary

Perimetric Techniques

Kinetic Perimetry

Static Threshold Perimetry

Static Suprathreshold Perimetry

Test Targets

Standard Achromatic Perimetry

Short-Wavelength Automated Perimetry

High-Pass Resolution Perimetry (Ring Perimetry)

Frequency-Doubling Technology Perimeter

Reliability Estimates

Fixation Accuracy

False-Positive Responses

False-Negative Responses

Analytical Techniques

Total Deviation and Pattern Deviation Plots

Global Indices

Linear Regression

Change Probability

Further Reading

Pharmacological Vitreolysis

Glossary

Introduction

The Role of the Vitreous in Disease

The Objectives of Pharmacological Vitreolysis

Enzyme Candidates for Vitreous Disruption

Chondroitinase

Hyaluronidase

Dispase

Plasmin and Microplasmin

Autologous Plasmin

Microplasmin

Summary

Further Reading

Pharmacology of Aqueous Humor Formation

Glossary

Physiology of Aqueous Humor Production

Aqueous Flow Suppressants

Carbonic Anhydrase Inhibitors

beta-Adrenergic Antagonists (beta-Blockers)

Adrenergic Agonists

Aqueous Humor Stimulants

Conclusions

Further Reading

Pharmacology of the Aqueous Humor Outflow

Glossary

Introduction

Drugs in Clinical Use That Act upon the Aqueous Humor Outflow Routes

Cholinergic Agents (Miotics)

Adrenergic Agonists

PG Analogs

Further Reading

Photopic, Mesopic and Scotopic Vision and Changes in Visual Performance

Glossary

Introduction

The Concept of Luminous Efficiency Function

Quality of Vision and Light Level

Spatial Acuity, Spatial Contrast Sensitivity, and Light Level

Pupil Size, Higher order Aberrations, and Light Level

Flicker Perception

Color Vision and Light Level

Conclusions

Further Reading

Photoreceptor Development: Early Steps/Fate

Glossary

Introduction

Photoreceptor Development

Rod and Cone Pattern in Human and Mouse Retina

Development of Cone and Rod Photoreceptors

Factors Affecting Photoreceptor Genesis

Early Stages in Photoreceptor Development

From RPC to Photoreceptor Precursor

From Cone Precursor to Cone Photoreceptor

From Rod Precursor to Rod Photoreceptor

Maturation of Photoreceptors

Current Research in Photoreceptor Development

Conclusions

Further Reading

The Photoreceptor Outer Segment as a Sensory Cilium

Glossary

Introduction

Turnover of the OS and Phototransduction Machinery

The Photosensitive Organelle as a Sensory Cilium

Evidence for Intraflagellar Transport in Photoreceptors

A Special Role for KIF17 in Photoreceptors

What Is the IFT Cargo

Summary and Perspective

Photoresponse in Squid

Glossary

Introduction

Molecular Components of Squid Visual Signal Transduction

Squid Rhodopsin

Squid Visual Guanine Nucleotide-Binding Protein, Gq

Squid Visual PLC

Light-Activated Ion Channel

Desensitization of Visual Signal Transduction

Squid Rhodopsin Kinase

Squid Visual Arrestin

Conclusion

Further Reading

Phototransduction: Adaptation in Cones

Glossary

Performance of the Photopic (Cone) System

Workhorse of Vision

Rapid Response and Moderate Sensitivity

Avoidance of Saturation

Light Adaptation of the Cones

Flashes on Backgrounds: Desensitization and Acceleration

Dependence of Sensitivity on Background Intensity: Weber's Law

Extremely Rapid Recovery of Cone Photocurrent

Molecular Basis of Cone Light Adaptation

Reaction Steps Underlying Rapid Recovery of the Cone's Light Response

Cone Avoidance of Saturation

Modeling of Human Cone Light Adaptation

Further Reading

Phototransduction: Adaptation in Rods

Glossary

Vision over a Billion-Fold Range of Light Intensities

Performance of the Scotopic (Rod) System

The Purpose of Light Adaptation: Optimization of Performance

Avoidance of Saturation: Range Extension

Extraction of Contrast Information and Optimization of Response Kinetics

Light Adaptation of the Rod Photoreceptors: Range Extension, Desensitization, and Acceleration

Prevention of Rod Photoreceptor Saturation: Range Extension

Desensitization and Acceleration

Unaltered Rising Phase, but Accelerated Recovery

Saturation of the Rod Photocurrent at Higher Background Intensities

Calcium-Dependent Mechanisms of Rapid Light Adaptation in Rod Photoreceptors

Role of Calcium: Resensitization through Prevention of Saturation

Powerful Negative-Feedback Loop Mediated by Calcium

Three Calcium-Sensitive Molecular Pathways

Guanylyl cyclase activation

Shortened R* lifetime

Channel reactivation

Rod Photoreceptor Light Adaptation Independent of Calcium

Accelerated Turnover of cGMP

Slow Changes in Rods: Light Adaptation or Dark Adaptation

Light-Induced Change in the Dominant Time Constant

Light-Induced Translocation of Proteins

Dark Adaptation of the Rods: Very Slow Recovery from Bleaching

Further Reading

Phototransduction: Inactivation in Cones

Glossary

Cone Signaling Cascade

Shutoff of the Light-Activated Cone Opsins

Inactivation of Transducin and PDE

Restoration of cGMP and Intracellular Calcium Level

Conclusions

Further Reading

Phototransduction: Inactivation in Rods

Glossary

What Needs to Be Inactivated: Overview of the Signaling Cascade

Shutoff of the Light-Activated Rhodopsin

Inactivation of Td and PDE

Resynthesis of cGMP and Restoration of Calcium Level

Light-Dependent Protein Translocation and Rod Signaling

Why Rods Do Not Have an Action Potential

Conclusions

Further Reading

Phototransduction in Limulus Photoreceptors

Glossary

Arrangement of Eyes in Limulus

The Microvillus is the Cellular Structure Mediating Visual Transduction

Studies of Visual Transduction Using Limulus Ventral Photoreceptors

The Light-Sensitive Conductance Consists of the Summed Effect of Conventional Ion Channels

The Response of the Ventral Photoreceptor is Mediated by the Phosphoinositide Cascade

The PI Cascade Generates at Least Two Intracellular Messenger Molecules

Roles of IP3 and Intracellular Ca2+ Ions in Excitation of Limulus Ventral Photoreceptors

IP3 Can Release Ca2+ from the SER

Released Ca2+ Ions can Activate an Inward Current

Light-Induced Ca2+ Release can be Detected before the Electrical Response

How Does IP3-Induced Ca2+ Release Activate Inward Current and is this Current Flowing through the Light- Sensitive Conductance

Adaptation, a Decrease in the Sensitivity of the Visual Cascade, is Mediated by Small, Lingering Elevations of Ca2+

Drosophila and Limulus Photoreceptors Operate Differently and Illustrate Two General Mechanisms Coupling the PI Cascade to an E

Extension of Phototransduction Mechanisms to other Microvillar Photoreceptor Types

Further Reading

Phototransduction: Phototransduction in Cones

Glossary

Introduction

Functional Properties of Cones

Obstacles for Studying Cone Phototransduction

Cone Visual Pigment and Phototransduction

Activation of Cone Phototransduction

Inactivation of Cone Phototransduction

Dark Adaptation of Cones

Light Adaptation in Cones

Epilog

Further Reading

Phototransduction: Phototransduction in Rods

Glossary

Introduction

Vertebrate Rods Are Highly Efficient Photon Detectors

Phototransduction in Rods: A G-Protein-Signaling Pathway

High Quantum Efficiency of Photoactivation

The Great Thermal Stability of Rhodopsin

The Activation of Transducin Constitutes the First Amplification Step

The High Catalytic Power of PDE Accounts For the Second Amplification Step

cGMP Is the Second Messenger Mediating Rod Phototransduction

The cGMP-Gated Channel Provides the Final Step of Signal Amplification

Further Reading

Phototransduction: Rhodopsin

Glossary

Rod Cells and Rhodopsin

Structure of Rhodopsin

Chromophore-Binding Site

Rhodopsin Cycle - Retinal Isomerization

Visual Cycle - Rhodopsin Regeneration

Vertebrate versus Invertebrate Rhodopsins

Signaling Cycle

Rhodopsin Interaction with Other Proteins

Rhodopsin-G t

Rhodopsin-GRK 1

Rhodopsin-Arrestin

Mutations in Rhodopsin and Retinal Diseases

Further Reading

Phototransduction: The Visual Cycle

Glossary

Clearance of All-trans-RAL from OS Disks

Reduction of All-trans-RAL to All- trans- ROL

Transfer of All-trans-ROL from Photoreceptors to the RPE

Synthesis of Retinyl Esters

Retinoid Isomerization

Synthesis of 11-cis-RAL Chromophore

Regeneration of Rhodopsin or Cone Opsin

Regulation of the Visual Cycle

Further Reading

Physiological Anatomy of the Choroidal Vasculature

Glossary

Blood Supply of the Choroid

Arterial Supply

Posterior ciliary arteries

Branches of the main PCAs

Ocular supply by the PCAs

Venous Drainage

Vortex veins

Normal In Vivo Circulation and Physiologic Anatomy of the Choroidal Vascular Bed

Posterior ciliary arteries

The medial PCA

The lateral PCA

The superior PCA

The SPCAs

Long PCAs

Choriocapillaris

Vortex veins

Choroidal anastomoses

Segmental Nature of the Choroidal Vascular Bed

Watershed Zones in the Choroidal Vascular Bed

Between PCAs

When there are two (medial and lateral) PCAs

When there are three or more PCAs

Between SPCAs

Between the Anterior Ciliary and SPCAs

Between the Vortex Veins

Clinical Importance of Watershed Zones Between the PCAs

Submacular Choroid

Peripapillary Choroid

Further Reading

Physiological Anatomy of the Retinal Vasculature

Glossary

Arterial Supply of the Retina

Central Retinal Artery

Cilioretinal Artery

Intraretinal Branches of the CRA

Retinal Capillary Bed

Retinal Venous Drainage

Nerve Supply

Blood-Retinal Barrier

Autoregulation of Retinal Blood Flow

Further Reading

The Physiological Consequences of Vitreous Composition

Glossary

Anatomy and Physiology of the Nonvitrectomized Eye

Mechanical Vitrectomy

Pharmacologic Vitreous Manipulation

Tractional Release During Vitrectomy

Cataract Formation after Vitrectomy

Other Molecular Changes after Vitrectomy

Chromovitrectomy

Vitreous Replacements

Sclerotomy Sites after Vitrectomy

Further Reading

Physiology of Photoreceptor Synapses and Other Ribbon Synapses

Glossary

Anatomy of the Ribbon Synapse

Vesicle Pools and Vesicular Release at Synaptic Ribbons

Role of the Ribbon in Release

Synaptic Proteins

Photoreceptor Calcium Channels

Role of Intracellular Ca2+ in Release

Physiology of Release at Photoreceptor Synapses

Disease-Related Mutations in Synaptic Proteins at the Photoreceptor Synapse

Further Reading

Pigment Dispersion Syndrome and Pigmentary Glaucoma

Glossary

History

Pathophysiology

Ultrasound Biomicroscopy

Electron Microscopy

Blinking

Accommodation

Exercise

Clinical Findings

Anterior segment

Posterior segment

Demographics of Pigment Dispersion Syndrome

Heredity

Gender

Race

Refractive error

Asymmetric involvement

Clinical Course

Active phase

Regression phase

Conversion to Glaucoma

Differential Diagnosis

Treatment

Further Reading

Polarized-Light Vision in Land and Aquatic Animals

Glossary

Polarized Light in Nature

Polarization Sensitivity and Polarization Vision

Polarization Responses of Photoreceptor Cells

Polarization sensitivity

Polarization vision

Disentangling polarization and color sensitivity

The Contributions of Polarized-Light Perception to Behavior

Sensitivity to Circularly Polarized Light

Summary

Further Reading

Posterior Capsule Opacification

Glossary

General Background

Regulatory Systems and Management of PCO

Surgical Factors

Biological Factors

Survival, proliferation, migration, and differentiation

Transdifferentiation, matrix contraction, and matrix deposition

Summary

Further Reading

Posterior Subcapsular and Anterior Polar Cataract

Glossary

Prevalence

Mechanisms

Cataractogenesis and Lens Epithelial Cells

Anterior Polar Cataract

Epithelial-Mesenchymal Transition

Steroid-Induced Cataract

Glucocorticoid

Lens Epithelial Cell Migration

Clinical Aspects

Further Reading

Post-Golgi Trafficking and Ciliary Targeting of Rhodopsin

Glossary

Introduction

Photoreceptor Polarity

Photoreceptor Biosynthetic Membrane Trafficking: Endoplasmic Reticulum, Golgi, and Post-Golgi Transport Carriers

Small GTPases of the Rab and Arf Families and Their Regulators in Rhodopsin Trafficking

Rabs

Arfs

SNAREs and their Regulators in Rhodopsin Trafficking

ROS is a Modified Primary Cilium

Conclusions anSummary

Further Reading

Presbyopia

Glossary

Accommodation

Presbyopia

Age-Related Changes in the Eye

Age-Related Changes in the Lens

Age-Related Changes in the Capsule

Increased Stiffness of the Lens

Further Reading

Primary Open-Angle Glaucoma

Glossary

Introduction

Definition

Pathophysiology

Risk Factors

Intraocular Pressure

Optic Disk Appearance in POAG

Visual Field

Treatment

Medical Treatments

Laser Treatments

Surgical Treatment

Further Reading

Primary Photoreceptor Degenerations: Retinitis Pigmentosa

Glossary

Background

Prevalence

Inheritance

Autosomal Recessive

X-Linked RP

Autosomal Dominant

Nonsyndromic versus Syndromic Retinal Degeneration

Classification of RP

Classification by Age of Onset

Classification by Fundus Appearance

Classification by Functional Loss

Mechanism of Disease

Clinical Presentation

Symptoms

Refraction

Anterior Segment and Cataract

Fundus Findings

Diagnostic Tests for RP

Dark Adaptation

Visual Fields

Electroretinograms

Fundus Photography/Fluorescein Angiography

Optical Coherence Tomography

Differential Diagnosis

Prognosis in RP

Current Treatments

Treatable Forms of RP

Resources/Support for Patients with RP

Optimizing Remaining Vision

Vitamin A

Docosahexanoic Acid

Neuroprotection/CNTF

Gene Therapy

Autologous RPE Transplantation

Stem-Cell-Based Therapies

Microelectrode Implants

Expression of Photosensitive Proteins

Conclusions

Further Reading

Primary Photoreceptor Degenerations: Terminology

Glossary

Histological and Fundus Features of Retinitis Pigmentosa

Bone Spicule Pigmentation

Waxy Pallor of the Optic Nerve

Peripapillary/Optic Nerve Head Drusen

Bull's Eye Maculopathy

Coats-Like Response

Classification of RP by Fundus Pattern

Classic Pattern for RP

Inverse RP

Concentric RP

Sector RP

RP Sine Pigmento

Tapetal-Like Reflex/Sheen

RP with Preserved Peri-Arteriolar RPE

Pigmented Paravenous Retinochoroidal Atrophy

Fundus Albipunctata

Retinitis Punctata Albescens

Gyrate Atrophy

Choroideremia

Syndromic Forms of RP

Abetalipoproteinemia

Alstroumlm Syndrome

Bardet-Biedl Syndrome

Chronic Progressive External Ophthalmoplegia/Kearns-Sayre Syndrome

Friedreich's Ataxia

Vitamin E Deficiency

Incontinentia Pigmenti (Bloch-Schulzberg Syndrome)

Joubert Syndrome

Mucopolysaccharide Disorders

Neuronal Ceroid Lipofuscinosis (Batten Disease)

Infantile Refsum Disease

Adult Refsum Disease

Senior-Loken Syndrome

Spinocerebellar Ataxia Type 7

Usher Syndrome

Visual Testing in RP

Terminology of Light Adaptation

Dark Adaptation

Visual Fields

ERG Terminology

Full-Field ERG

Multifocal ERG

Rod-Isolated ERG Response

Mixed Rod-Cone ERG Response

Cone-Isolated ERG Response

Further Reading

Proliferative Vitreoretinopathy

Glossary

Introduction

Definition

Location of PVR Membranes

The Significance of Membrane Formation in PVR

The Cells Involved in PVR

Glial Cells

RPE Cells

Fibroblastic Cells

Macrophages

Vascular Elements

Other Cells

The Extracellular Matrix in PVR Membranes

Pathogenesis and Natural History

Intraretinal PVR

Incidence and Risk Factors

Clinical Classification of Proliferative Vitreoretinopathy

Management

Outcomes

Conclusions

Further Reading

Properties and Functions of the Vessels of the Ciliary Body

Glossary

Arterial and Venous Supply of the Ciliary Body

Vascular Organization of the CB

Characteristics and Properties of the CB Capillaries

Comparative Angioarchitecture of the Ciliary Processes in Other Species

Further Reading

Pseudoexfoliation Syndrome and Glaucoma

Glossary

Pseudoexfoliation Syndrome

Definition

Epidemiology

Etiology and Pathogenesis

Genetics

Pathogenesis

Molecular pathophysiology

Pathogenetic concept

Clinical Findings

Diagnosis

Asymmetry of involvement

Ocular manifestations and complications

Systemic manifestations

Pseudoexfoliation Glaucoma

Clinical Characteristics

Pathomechanisms of Glaucoma Development

Therapeutic Aspects

Medical therapy

Laser therapy

Surgical therapy

Further Reading

Pupil

Glossary

Advantages of a Mobile Pupil

Overview of the Pathways Controlling Pupil Diameter

Iris Musculature

Pupillary Light Reflex

Description

Afferent Pathway

Intrinsically photosensitive retinal ganglion cells

Pretectal olivary nucleus

Efferent Pathway

Sympathetic Influences on the PLR

The Pupillary Near Response

Description

Efferent Pathway of the PNR

Afferent Influences on the PNR

Additional Cortical Influences on Pupillary Responses

Visually Mediated Cortical Influences on Pupillary Behavior

Task-Evoked Pupillary Responses

Influence of Alertness on Pupillary Behavior

Arousal

Sleep

Ascending Neuromodulatory Systems

Acknowledgments

Further Reading

e9780123741981v4

Front Cover

Encyclopedia of the Eye

Copyright Page

Contributors

Editors Biographies

Editors Affiliations

Preface

Foreword

Subject Classification

Guide to use of the Encyclopedia

Contents

VOLUME 4

R

Refractive Surgery

Glossary

Short Historical Background of Corneal Refractive Surgery

The LASIK Procedure

Corneal Refractive Surgery, Wound Healing, and Haze

Corneal Refractive Surgery, Optical Aberrations, and Visual Quality

Causes for Spherical Aberration Increase Following Corneal Refractive Surgery

Corneal Biomechanical Effects in Refractive Surgery

Other Side Effects and Complications of PRK and LASIK

Safety, Efficacy, and Satisfaction of LASIK

Toward an Optimization of the Corneal Refractive Surgery Procedure

Further Reading

Refractive Surgery and Inlays

Glossary

Introduction

Radial Keratotomy

Photorefractive Keratectomy

Laser in situ Keratomileusis

Laser-Assisted Subepithelial Keratectomy

Epithelial Laser in situ Keratomileusis (epi-LASIK)

Femtosecond Laser in situ Keratomileusis (FS-LASIK)

Treatment of Hyperopia

General Side Effects of Laser Refractive Surgery

Wave front and Laser Refractive Surgery

Corneal Inlays

Intracorneal Rings (ICR)

Conclusion

Further Reading

Regulation of Corneal Endothelial Cell Proliferation

Glossary

Background

Cell Cycle Progression, G1/S Transition and its Cell Cycle Regulators

G1 Phase Cell Cycle Arrest in CECs in vivo

Cell-Cell Contact Inhibition

The Presence of Antiproliferative TGF-beta2 in the Aqueous Humor

The Interaction Between CECs and Extracellular Matrix

What Do We Know From Primary and Subcultured CECs

Age-Related Decrease in Sensitivity to Mitogen or Growth Factors in Cultured HCECs

Comparison of Proliferative Capacity of HCECs from Central and Peripheral Regions

Overexpression of E2F2 Promotes Proliferation of CEC

PKC Signaling Pathways in Regulating Proliferation of CECs

FGF-2 Signaling Pathway

Summary

Further Reading

Regulation of Corneal Endothelial Function

Glossary

Corneal Endothelial Function

Stromal Swelling Pressure and Maintenance of Transparency

Endothelial Barrier Function

Nutrition/Waste Removal

Corneal Endothelial Transport

Active Transport

Bicarbonate/Carbonic Anhydrase

Anion Transporters and Channels

Aquaporin-1 (AQP1)

Pump Mechanism

Barrier Integrity

MLC Phosphorylation and Actomyosin Contraction

Effect of MLC Phosphorylation on Corneal Endothelium Barrier Integrity

Transplantation Failure and Tumor Necrosis Factor

Regulation of Transport Activity and Barrier Integrity

Adenosine, Soluble Adenylate Cyclase, and cAMP

Role of cAMP-PKA axis in the Regulation of Barrier Integrity

Summary and Perspective

Further Reading

Regulation of Extracellular Matrix Turnover in the Aqueous Humor Outflow Pathways*

Glossary

Introduction

Transforming Growth Factor-beta

TGF-beta Activation and Thrombospondin-1

Connective Tissue Growth Factor

Bone Morphogenic Proteins

Smad7

Conclusions

Further Reading

Regulation of Intraocular Oxygen by the Vitreous Gel

Glossary

Introduction

Mapping of Intraocular Oxygen: Oxygen Gradients

The Vitreous Gel Consumes Oxygen: Experiments with Cadaver Vitreous

Ascorbate in the Vitreous Gel

Oxygen Consumption in the Human Vitreous Gel

The Importance of the Gel Structure of the Vitreous

Vitreous Liquefaction/Surgery Leads to Loss of Vitreous Gel Function

Intraocular Oxygen Tension after Vitrectomy Surgery

Conclusion

Further Reading

Retinal Cannabinoids

Glossary

Marijuana and the Endocannabinoids

Synthesis and Release

Inactivation

Receptors

Distribution and Function

Cannabinoids and Ocular Tissues

Cannabinoids - Retinal Anatomy

Biochemical Assay

Localization - Cannabinoid Receptors

Localization - Metabolizing Enzymes

Cannabinoids - Retinal Physiology

Effects on Transmitter Release

Effects on Ganglion cells

Effects on Bipolar Cells

Cannabinoids and Photoreceptors

Voltage-Gated Currents

WIN 55,212-2 Affects the Cone Light Response

Cannabinoids - Development and Neuroprotection

Conclusion

Further Reading

Retinal Degeneration through the Eye of the Fly

Glossary

The Compound Eye and Phototransduction

Genetic Screens Identify Retinal Degeneration Loci

Retinal Degenerations in Flies and Humans

Mechanisms of Retinal Degenerations

Light-Dependent Retinal Degenerations

Light-Independent Retinal Degenerations

Retinal Degenerations Caused by Mutations in Dual-Role Proteins

Summary

See also

Further Reading

Retinal Ganglion Cell Apoptosis and Neuroprotection

Glossary

Introduction

Apoptosis

Apoptosis in Glaucoma

Diagnosis and Measuring Glaucoma Progression

Current Treatments for Glaucoma

Neuroprotection

Research Models

In Vitro Glaucoma Models

In Vivo Glaucoma Models

Mechanisms of Apoptosis and Development of Neuroprotective Agents

Neurotrophic Factor Withdrawal

NFs as Neuroprotective Agents

Excitotoxicity

NMDA-Antagonists and Neuroprotective Agents

Reactive Oxygen Species

Mitochondrial Dysfunction and ROS Generation

Antioxidants as Neuroprotective Agents

Protein Misfolding

Reduction of Misfolded Proteins in Neuroprotection

Glial-Neuronal Interactions

Extracellular Matrix Degradation

Neuroprotective Vaccine

Summary

Further Reading

Retinal Histogenesis

Glossary

Birthdating

Lineage Tracing

Environmental Challenge

Transcription Factors and Competence

Conclusions

Further Reading

Retinal Pigment Epithelial-Choroid Interactions

Glossary

Introduction

RPE-C horoid Complex Development

RPE Development

Choroid Development

BrM Development

RPE-C horoid Complex: Structure and Function

RPE Structure and Function

Choroid Structure and Function

BrM Structure and Function

RPE-C horoid Interactions

Interactions During Development

Interactions in the Adult

Growth factor secretion

Receptor expression

Isoform-specific VEGF mouse model

Choroidal change impact on RPE

RPE-C horoid Changes with Age

BrM Changes

Gene Expression

Conclusions

Further Reading

Retinal Pigment Epithelium: Cytokine Modulation of Epithelial Physiology

Glossary

Introduction

Human RPE: Morphology, Polarity, and Function

pHi - Induced Changes in Fluid Absorption

Modulation of SRS Metabolic Load and Chemical Composition

Oxidative Stress

RPE-I mmune System Interactions in and around the SRS

Modulation of RPE Proliferation and Migration by Cytokines and Growth Factors

IFNgamma Regulation of RPE Fluid Transport

Leukocyte Migration across the RPE: A Model of Disease Progression

Further Reading

Retinal Vasculopathies: Diabetic Retinopathy

Glossary

Background

Risk Factors for DR

Pathogenesis

Classifications

Nonproliferative Diabetic Retinopathy

Macular Edema

Proliferative Diabetic Retinopathy

Screening for Diabetic Retinopathy

Further Reading

Retinal Pigmented Epithelium Barrier

Glossary

Introduction

Structure and Function

Tissue Level

Cellular Level

Molecular Level

Regulation of RPE Tight Junctions

Clues from Embryonic Maturation

Assembly of Tight Junctions during Differentiation

Culture Models to Study Regulation of the Outer Blood-Retinal Barrier

RPE in the Larger Context of Ocular Biology and Disease

Further Reading

Retinopathy of Prematurity

Glossary

Clinical Background

Epidemiology

Clinical Classification of ROP

Management of ROP

Treatment of ROP

Acute neovascular stages

Fibrovascular stages/retinal detachment

Visual rehabilitation in preterm infants

Genetics Related to ROP

Pathophysiology of ROP

Role of Oxygen in Retinal Development

Animal Models of Severe ROP

Mouse OIR (model of aggressive posterior ROP)

Rat 50/10 OIR (model of peripheral severe ROP)

Role of Avascular Retina

Role of Growth Factors

Vascular Endothelial Growth Factor

IGF-1 - IGF 1BP3

Erythropoietin

HIF 1alpha

Role of Oxidative Stress

Future Treatment Considerations

Further Reading

Rhegmatogenous Retinal Detachment

Glossary

Pathophysiology

Clinical Features

Symptoms

Signs

Break type - identification

Retinal tears

Retinal round holes

Retinal dialyses

Break localization - principles based on topography of RRD

Superotemporal and superonasal

Midline (12 o'clock meridian) and total detachments

Inferior

Chronic RRD

Differential Diagnoses

Management

Conservative

RRD due to retinal tear

RRD due to retinal hole or dialysis

Laser Demarcation

RRD due to retinal tear

RRD due to retinal hole or dialysis

Pneumatic Retinopexy

RRD due to retinal tear

RRD due to retinal hole or dialysis

Scleral Buckling

RRD due to retinal tear

RRD due to retinal hole or dialysis

Vitrectomy

RRD due to retinal tear

RRD due to retinal hole or dialysis

Outcomes

Pneumatic Retinopexy

Scleral Buckling

Pars Plana Vitrectomy

Complications

Pneumatic Retinopexy

Scleral Buckling

Pars Plana Vitrectomy

Treatment Failure

New Developments

Further Reading

Rod and Cone Photoreceptor Cells: Inner and Outer Segments

Glossary

Further Reading

Rod and Cone Photoreceptor Cells: Outer-Segment Membrane Renewal

Glossary

Further Reading

Rod Photoreceptor Cells: Soma and Synapse

Glossary

Introduction

Structure

Morphology and Topology

Axon and Terminal

Synapse

Invagination

Biophysical Properties

Gap Junctions

Function

The Single-Photon Signal and Noise

Sources of Noise

Synaptic Transfer Function: High Gain and Temporal Filtering

Rate of Vesicle Release

Synaptic Transfer Function: Nonlinear Threshold

Electrical Coupling in Starlight

Electrical Coupling in Twilight

Negative Feedback

Conclusion

See also

Further Reading

The Role of Acetylcholine and Its Receptors in Retinal Processing

Glossary

Introduction

nAChRs Receptors

nAChR Subunits in the Vertebrate Retina

Distribution of alphaBgt-Sensitive nAChRs

alphaBgt-Insensitive nAChR Expression in the Retina

nAChR Pharmacology

Agonists

Nicotine

Carbamylcholine

Cytisine

Epibatidine

Choline

Antagonists

d-Tubocurarine (Curare)

Dihydro-beta-erythroidine

Hexamethonium and mecamylamine

alpha-Bungarotoxin (alpha-Bgt)

alpha-Conotoxins

Methyllycaconitine (MLA)

nAChR Function in the Retina

Directional Selectivity

nAChRs in Retinal Development

Conclusions/Summary

Further Reading

Role of Complement in Ocular Immune Response

Glossary

Introduction

Activation of Complement System

Regulation of the Complement System

Complement System and Protection of Eye

Complement System and Ocular Immune Responses

Ocular Tolerance

Autoimmune Uveitis

Complement and Age-Related Macular Degeneration

Keratitis

Glaucoma

Retinal Disorders

See also

Further Reading

The Role of Oxidative Stress in the Trabecular Meshwork

Glossary

Introduction

Antioxidant Mechanisms in the Outflow Pathways

Evidence of Oxidative Stress in the Outflow Pathway

Effects of Oxidative Stress on the Outflow Pathway

Conclusions and Future Perspectives

Further Reading

Role of Proteoglycans in the Trabecular Meshwork

Glossary

Aqueous Humor Outflow Resistance

Trabecular Meshwork

Site of Outflow Resistance

Extracellular Matrix

Glycosaminoglycans

Structure and Properties

GAG Biosynthesis

GAGs of the TM

GAG Turnover

Proteoglycans

Structure and Properties

PG families

PGs of the TM

Alternative splicing

Further Reading

The Role of the Ciliary Body in Aqueous Humor Dynamics Structural Aspects

Glossary

Introduction

Ciliary Processes

Ciliary Muscle

See also

Further Reading

The Role of the Vitreous in Macular Hole Formation

Glossary

Vitreous Anatomy and Biochemistry

Vitreous Traction

Vitreoretinal Interface

Confounding Observations

Summary

Further Reading

Subject Index

S

Secondary Photoreceptor Degenerations: Age-Related Macular Degeneration

Glossary

Introduction

Incidence

The Macula

Clinical Symptoms

Histopathology

Risk Factors

Genetics

CFH

ARMS2/HTRA1

Treatments

Further Reading

Secondary Photoreceptor Degenerations*

Glossary

Introduction

Mechanisms of Secondary Photoreceptor Death

Further Reading

Stability and Functional Integrity of New Blood Vessels

Glossary

Formation of New Blood Vessels During Development and Under Pathological Conditions

Cell-Cell Adhesive Junctions in Blood Vessel Walls

Recruitment of Pericytes in New Blood Vessels

Angiopoietin/Tie Signals as Regulators of Stability and Integrity of Blood Vessels

Molecular Properties of Angiopoietins and Tie Receptors

Regulation of Angiogenesis and Vascular Homeostasis by Ang/Tie Signals

Intracellular Signaling Cascades Mediated by Tie2 Activation

Stability and Functional Integrity of Retinal Blood Vessels

Clinical Therapies to Restore Vascular Integrity in Retinal Vascular Disorders

Conclusion

Further Reading

Stem Cells of the Ocular Surface

Glossary

The Ocular Surface

Anatomy

Development

Homeostasis and Repair

Properties of Stem Cells

Stem Cells in the Corneal Epithelium

Characteristics of Limbal Stem Cells

Limbal Stem Cell Niche

Limbal Stem Cell Deficiency

Understanding the Role for LSC in Corneal Homeostasis

Conjunctival Stem Cells

Corneal Stromal Stem Cells

Corneal Endothelial Stem Cells

Conclusions

See also

Further Reading

Steroid-Induced Ocular Hypertension and Effects of Glucocorticoids on the Trabecular Meshwork

Glossary

Introduction

Steroid-Induced Ocular Hypertension

Possible Role of GCs in POAG

GC Effects on the TM

Summary

Further Reading

Structural Changes in the Trabecular Meshwork with Primary Open Angle Glaucoma*

Glossary

Introduction

Effect of Accommodation on Outflow Resistance

Age-Related Changes of the CM- TM- System

Morphological Changes in the Outer TM of Eyes with POAG

Regional Differences

Correlation between TM Changes and Axon Loss in the Optic Nerve

See also

Further Reading

Structure and Evolution of Crystallins

Glossary

What Are Crystallins

alpha-Crystallins

Structure and Implications for Function

The beta- and gamma-Crystallins

The betagamma-Crystallin Fold and Tertiary Structure

Surface and sulfur

Mapping of Protein and Gene Structure

Nonlens Relatives

Gene Families

Taxon-Specific Crystallins

Conclusions

Further Reading

The Surgical Treatment for Corneal Epithelial Stem Cell Deficiency, Corneal Epithelial Defect, and Peripheral Corneal Ulcer

Glossary

Introduction

Corneal Epithelial Transplantation for Total Stem Cell Deficiency

In Vivo Expansion of Corneal Epithelial Cells (Keratolimbal Allografts)

History and concept of ocular surface reconstruction

Indications

Surgical procedure

Postoperative management

Other surgical procedures

Ex Vivo Expansion of Corneal Epithelial Cells

History and concepts

AM as a suitable carrier for corneal epithelial cell culture

Cell culture procedure

Indications

Surgical procedure

Postoperative management

Clinical outcome of allogeneic cultivated corneal epithelial transplantation

Ex Vivo Expansion of Oral Mucosal Epithelial Cells

Concept

Cell culture procedure

Indications

Surgical procedure and postoperative medications

Clinical outcome of cultivated autologous oral mucosal epithelial transplantation

Phototherapeutic Keratectomy for Corneal Epithelial Disorders

PTK for Corneal Epithelial Defect

Indications

Surgical procedure

Postoperative management

Tectonic Lamellar Keratoplasty for Peripheral Corneal Ulcers

Concept

Rheumatoid Arthritis

Mooren's Ulcer

Further Reading

T

Tear Drainage

Glossary

History

Development

Anatomy and Dimensions

Comparative Anatomy

Tear Transport through Canaliculi

Tear Transport through Lacrimal Sac and Nasolacrimal Duct

Innate Immune Mechanisms

Adaptive Immune Mechanisms

Absorption of Tear Fluid Components

Conclusions

Further Reading

Tear Film

Glossary

The Role of the Tear Film

Structure and Thickness of the Tear Film

The Lipid Layer

Tear Evaporation

The Aqueous Layer

Tear Production

The Mucin Layer

Tear Distribution and Stability

Tear Film Osmolarity

Drainage of Tears

Absorption of Tears by the Ocular Surface

Further Reading

Tear Film Overview

Glossary

The Structure and Function of the Tear Film

The Function and Structure of the Lipid Layer of Tear Film

The Relationship Between Tear-Film Lipids and Refraction

The Structure and Function of Aqueous Layer of the Tear Film

The Structure and Function of Mucous Layer of the Tear Film

Methods to Evaluate the Ocular Surface Health and Tear Functions

Fluorescein Staining

Rose Bengal/Lissamine Green Staining

Impression Cytology

Assessment of Tear Film Stability and Quantity

Tear-Film Break-Up Time (TFBUT)

Schirmer's Test

Assessment of Other Tear Functions

Tear Osmolarity

Lipid-Layer Interferometry

Tear-Stability Analyses

Functional Visual Acuity

Higher Order Aberration (HOA) Measurement

Further Reading

Thyroid Eye Disease

Glossary

Introduction

Epidemiology

Etiology

Genetic Contributions

Mechanical Factors

Uncontrolled Thyroid Dysfunction

Tobacco Smoking

Radioiodine Therapy for Graves' Disease

Pathophysiology

Histology

Cytokines

Orbital Autoantibodies

Future Management

Further Reading

U

Unique Specializations - Functional: Dynamic Range of Vision Systems

Glossary

Introduction

Rods versus Cones

The Pathways Concept

Rod Bipolar Pathway

Signal transfer from rods to rod bipolar cells

Signal transfer from rod bipolar cells to AII amacrine cells

Ganglion cell sensitivity

Rod-Cone Pathway

Rod-OFF Pathway

Cone Pathways

Adaptation to Mean Background Light

Adaptation: Rod Pathways

Adaptation: Cone Pathways

Conclusions

Further Reading

Uveoscleral Outflow*

Glossary

Morphology

Techniques to Determine the Rate of Uveoscleral Flow

Experimental Animals

Human Eyes

Normal Values

Values Obtained with Tracers in Different Species

Calculated Values from Human Eyes

Effect of Age

Physiology

Effect of IOP

Effect of Ciliary Muscle Tone

Pharmacology

Cholinergic Agents

Adrenergic Agents

Prostaglandins

Role of Uveoscleral Flow in Normal and Diseased Eyes

Glaucoma

Uveitis

Further Reading

V

The Vascular Stem Cell

Glossary

The Discovery of the Endothelial Precursor Cell and Circulating Endothelial Cells

Bone Marrow Microenvironment for the Hematopoietic Stem Cells

Clonal Relationship of EPCs to HSCs

Nomenclature of the EPC

Making New Blood Vessels with BM Cells

EPCs as a Source of Paracrine Growth Factors for Vessel Growth

What Are EPCs Doing in the Eye When Are They Good When Are They Bad

EPC in the Cornea

EPC in Age-Related Macular Degeneration

EPC in the Retinal Disease

Hypoxia-Regulated Factors Recruit EPC to the Ischemic Retina

Do Cell Therapies Have a Role in the Eye If so, Who Will Benefit

Type 1 Diabetes Induces BM-Derived Cell Dysfunction

Can Diabetes Alter Cytokine Secretion by EPCs

Type 1 Diabetes Induces Nitric Oxide Dysfunction in EPCs

Drug Modulation of EPC Function

Further Reading

Vessel Regression

Glossary

Introduction

Vasoregression in Diabetic Retinopathy

The Role of Pericytes in Vasoregression

The Mechanisms Leading to Pericyte Dropout

Pericyte apoptosis

Pericyte migration

The Biochemistry of Microvascular Damage and Vasoregression

Endothelial Damage and Loss Leading to Vasoregression

The Mediators of Vasoregression

Prevention of Vasoregression

Biochemial Pathway Inhibitors

Metabolic Signal Blockers

Catalytic Antioxidants

See also

Further Reading

Vitreous Anatomy, Aging, and Anomalous Posterior Vitreous Detachment

Glossary

Vitreous Anatomy

Vitreous Body

Vitreous Base

Vitreous Cortex

Vitreoretinal Interface

Aging Changes

Posterior Vitreous Detachment (PVD)

Epidemiology of PVD

Pathogenesis of PVD

Sequela of PVD

Anomalous PVD

Retinal Tears

Vitreo-Macular Traction Syndrome

Vitreoschisis

Macular Pucker

Macular Holes

Further Reading

X

Xenopus laevis as a Model for Understanding Retinal Diseases

Glossary

Introduction

Early Work on X. laevis - Biochemistry, Electrophysiology, and Microscopy

X. laevis as a Model for Vitamin A Deprivation

X. laevis as a Model for Glaucoma

X. laevis and Studies of the Transport of Rhodopsin

Modeling RP in Transgenic X. laevis

Inducible RD

Other Transgenic X. laevis Models of Retinal Disease

X. laevis as a Model for Eye Development/Developmental Disorders

X. laevis Models of Retinal Regeneration

Summary

Further Reading

Z

Zebrafish as a Model for Understanding Retinal Diseases: Pde6, Apoptosis, and the Bystander Effects

Glossary

Introduction

Retinal Disease

Animal Models of Vision

The Advantages and Techniques of the Zebrafish Model System

Evaluating zebrafish vision

The Visual System: Phosphodiesterase and Phototransduction

Retinal Degeneration in pde6 Mutants: Primary Degeneration

Retinal Degeneration in pde6 Mutants: Secondary Retinal Degeneration, the Bystander Effect - Models and Mechanisms

Levels of the Bystander Effect in Photoreceptor Degeneration

Zebrafish Models of Retinal Degeneration: Mutations in pde6c

pde6cw59

els

Pde6 Structure

Conclusion

Further Reading

Zebrafish: Retinal Development and Regeneration

Glossary

Introduction

Embryonic Eye Patterning

Zebrafish Eyes Form from a Single Field in the Anterior Neural Plate

The Laminar Structure of the Retina Forms as Cells Exit the Cell Cycle and Differentiate

Addition of Retinal Cells Throughout the Life of a Zebrafish

Regeneration in the Zebrafish Retina

Zebrafish regenerate all retinal neurons

Constant Intense Light Kills Photoreceptors, Which Are then Regenerated by Muumlller Glia

Discovery and Analysis of Candidate Genes Involved in Retinal Regeneration

Events Underlying Regeneration of the Light-Damaged Retina

Vestigial Retinal Regeneration Activity in Mammals

Similarities and Differences of Development with Retinal Ontogeny/Genesis

Further Reading

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