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Related Concept Videos

Glaucoma: Overview01:25

Glaucoma: Overview

Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
Open Angle Glaucoma: Treatment01:27

Open Angle Glaucoma: Treatment

In open-angle glaucoma, the iridocorneal angle remains open, but the trabecular meshwork becomes stiff, slowing down the outflow of aqueous humor. This causes a buildup of aqueous humor in the anterior chamber, leading to a sudden increase in intraocular pressure. The treatment for open-angle glaucoma focuses on reducing the elevated intraocular pressure by either decreasing the secretion of aqueous humor or increasing its outflow.
Drugs such as carbonic anhydrase inhibitors, α2- and...
Angle Closure Glaucoma: Treatment01:28

Angle Closure Glaucoma: Treatment

Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...

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Related Experiment Video

Updated: May 24, 2026

Glaucoma-inducing Procedure in an In Vivo Rat Model and Whole-mount Retina Preparation
08:30

Glaucoma-inducing Procedure in an In Vivo Rat Model and Whole-mount Retina Preparation

Published on: March 12, 2016

'Structure-function relationship' in glaucoma: past thinking and current concepts.

Rizwan Malik1, William H Swanson, David F Garway-Heath

  • 1NIHR Biomedical Research Centre for Ophthalmology, Moorfields Eye Hospital NHS Foundation Trust & UCL Institute of Ophthalmology, London, UK.

Clinical & Experimental Ophthalmology
|February 21, 2012
PubMed
Summary
This summary is machine-generated.

Understanding the structure-function relationship in primary open-angle glaucoma is key for disease grading and natural history. Evidence shows structural or functional changes can precede the other at the individual level.

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Last Updated: May 24, 2026

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08:30

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Trabecular Meshwork Response to Pressure Elevation in the Living Human Eye
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Area of Science:

  • Ophthalmology
  • Glaucoma Research
  • Visual Neuroscience

Background:

  • Accurate grading of primary open-angle glaucoma (POAG) severity and understanding its progression requires knowledge of the link between structural and functional measures.
  • Current understanding of the structure-function relationship in POAG is evolving, with ongoing research into its complexities.

Purpose of the Study:

  • To review the existing evidence on the relationship between structural and functional measures in POAG.
  • To discuss mathematical models that link structure and function in the context of POAG.
  • To provide clinicians with an overview of historical and current perspectives on the POAG structure-function relationship.

Main Methods:

  • Literature review of clinical trials and scientific research.
  • Analysis of data linking structural abnormalities (e.g., optic nerve damage) with functional deficits (e.g., visual field loss).
  • Examination of mathematical models used to quantify the structure-function relationship.

Main Results:

  • Large clinical trials indicate that both structural and functional changes are evident in advanced POAG.
  • At the individual patient level, structural abnormalities may precede functional deficits, or vice versa.
  • The precise nature of the structure-function relationship remains a subject of ongoing scientific debate.

Conclusions:

  • The relationship between structure and function in POAG is complex and varies among individuals.
  • Continued research is essential to fully elucidate this relationship for improved clinical management.
  • This review synthesizes current knowledge to aid clinicians in understanding POAG progression.