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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...
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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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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...
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
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DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...

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Related Experiment Video

Updated: Jun 15, 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

Linking structure and function in glaucoma.

R S Harwerth1, J L Wheat, M J Fredette

  • 1College of Optometry, University of Houston, 505 J. Davis Armistead Building, Houston, TX 77204-2020, USA. rharwerth@uh.edu

Progress in Retinal and Eye Research
|March 16, 2010
PubMed
Summary
This summary is machine-generated.

Researchers developed a new model linking visual field sensitivity loss to retinal nerve fiber layer thinning in glaucoma patients. This structure-function model aids in understanding disease progression and comparing clinical test results for better glaucoma management.

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08:30

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Published on: March 12, 2016

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A Model of Glaucoma Induced by Circumlimbal Suture in Rats and Mice

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Medical Imaging

Background:

  • Glaucoma involves progressive loss of retinal ganglion cells, leading to optic neuropathy, vision loss, and structural changes in the retina and optic nerve head.
  • Diagnosis and management of glaucoma rely on tests quantifying functional visual deficits and structural abnormalities, yet linking these measures has been a recent focus.

Purpose of the Study:

  • To develop and validate a nonlinear model that links functional visual sensitivity losses with structural thinning of the retinal nerve fiber layer in glaucoma.
  • To provide a framework for understanding the relationship between structure and function in glaucoma, aiding clinical interpretation and disease staging.

Main Methods:

  • Constructed a model using pointwise relationships between visual sensitivity (monkey perimetry) and retinal ganglion cell density (histology).
  • Integrated data from human studies on aging and clinical glaucoma, comparing standard clinical perimetry with optical coherence tomography.
  • Evaluated the nonlinear model's accuracy in predicting retinal nerve fiber layer thickness from visual sensitivities and tested it on independent patient cohorts.

Main Results:

  • The developed nonlinear structure-function model accurately and precisely translated visual field sensitivities into predicted retinal nerve fiber layer thickness.
  • Testing on two independent patient populations confirmed the predictive relationship between retinal nerve fiber layer thickness and visual sensitivities.
  • The model demonstrated a reliable correlation between functional visual deficits and structural thinning in glaucoma.

Conclusions:

  • The proposed model successfully links structure and function in glaucoma, offering valuable insights into standard clinical testing results and neuronal loss.
  • This model has potential clinical applications for comparing different tests and accurately staging glaucoma disease progression.
  • Understanding the structure-function relationship is crucial for advancing glaucoma diagnosis and patient management.