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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...

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Related Experiment Video

Updated: Jul 14, 2026

Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation
07:11

Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation

Published on: December 8, 2023

The relationship between structural and functional alterations in glaucoma: a review.

C A Johnson1, G A Cioffi, J R Liebmann

  • 1Discoveries In Sight Laboratories, Devers Eye Institute, Portland, OR 97210, USA.

Seminars in Ophthalmology
|June 26, 2007
PubMed
Summary

Glaucoma damages the optic nerve head and retinal nerve fiber layer, leading to vision loss. Structural changes often precede functional deficits, but more research is needed to confirm these glaucoma findings.

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Full-Circle Cauterization of Limbal Vascular Plexus for Surgically Induced Glaucoma in Rodents

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Last Updated: Jul 14, 2026

Functional Magnetic Resonance Imaging (fMRI) of the Visual Cortex with Wide-View Retinotopic Stimulation
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Full-Circle Cauterization of Limbal Vascular Plexus for Surgically Induced Glaucoma in Rodents
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Full-Circle Cauterization of Limbal Vascular Plexus for Surgically Induced Glaucoma in Rodents

Published on: February 15, 2022

Area of Science:

  • Ophthalmology
  • Neuroscience

Background:

  • Glaucoma is a leading cause of irreversible blindness.
  • Understanding the relationship between structural damage and visual function loss is crucial for early diagnosis and management of glaucoma.

Purpose of the Study:

  • To review the relationship between structural changes in the optic nerve head and retinal nerve fiber layer and visual function deficits in glaucoma.
  • To identify reliable predictors of glaucomatous visual field loss.

Main Methods:

  • Review of existing literature on structure-function relationships in glaucoma.
  • Assessment of qualitative, semi-quantitative, and quantitative methods for evaluating optic nerve head and retinal nerve fiber layer structure.
  • Evaluation of standard automated perimetry and novel visual function testing techniques.

Main Results:

  • A significant relationship exists between structural and functional deficits in glaucoma.
  • Structural changes typically precede functional losses.
  • Focal damage shows a good topographic correlation between structural and functional deficits.
  • Optic nerve head and retinal nerve fiber layer measures can predict visual field loss.

Conclusions:

  • Structure-function relationships in glaucoma are well-established, with structural damage often preceding visual field loss.
  • Current research limitations include small sample sizes, lack of standardized criteria, and insufficient longitudinal studies.
  • Further prospective studies are needed to strengthen the understanding of glaucoma progression and its impact on vision.