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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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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,...
Open Angle Glaucoma: Treatment01:27

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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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Related Experiment Video

Updated: Jun 18, 2026

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
07:11

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Published on: May 25, 2020

Diffuse glaucomatous structural and functional damage in the hemifield without significant pattern loss.

Dilraj S Grewal1, Mitra Sehi, David S Greenfield

  • 1Palmer Eye Institute, Department of Ophthalmology, University of Miami Miller School of Medicine, Palm Beach Gardens, FL 33418, USA.

Archives of Ophthalmology (Chicago, Ill. : 1960)
|November 11, 2009
PubMed
Summary

Glaucoma patients with visual field loss show reduced retinal nerve fiber layer (RNFL) thickness and retinal sensitivity in unaffected areas. This structural and functional damage is proportionally linked to glaucoma severity.

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Area of Science:

  • Ophthalmology
  • Neuroscience

Background:

  • Glaucoma is a progressive optic neuropathy characterized by visual field loss.
  • Assessing structural and functional changes in early glaucoma is crucial for timely intervention.

Purpose of the Study:

  • To compare retinal nerve fiber layer (RNFL) thickness and retinal sensitivity in the normal visual hemifield of glaucomatous eyes with localized visual field loss.
  • To evaluate the relationship between RNFL atrophy and glaucoma severity.

Main Methods:

  • Standard automated perimetry, stereoscopic photography, scanning laser polarimetry, and optical coherence tomography (OCT) were used.
  • Retinal sensitivity and RNFL thickness were measured in the normal hemifield.
  • Glaucoma severity was assessed using visual field pattern standard deviation and cup-disc ratio.

Main Results:

  • Mean RNFL thickness was significantly thinner in the glaucoma group compared to normal and suspected glaucoma groups across all imaging modalities.
  • Mean retinal sensitivity was significantly reduced in the glaucoma group.
  • Cup-disc ratio correlated significantly with RNFL thickness.

Conclusions:

  • Diffuse RNFL atrophy and reduced retinal sensitivity are present in glaucomatous eyes even with localized visual field deficits.
  • Glaucomatous damage impacts both retinal structure and function proportionally.