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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...
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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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Photoreceptors and Visual Pathways

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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Updated: Jun 18, 2026

Full-Circle Cauterization of Limbal Vascular Plexus for Surgically Induced Glaucoma in Rodents
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Selective versus nonselective losses in glaucoma.

C A Johnson1

  • 1Optics and Visual Assessment Laboratory (OVAL), Department of Ophthalmology, University of California, Davis, Davis, California, U. S. A.

Journal of Glaucoma
|November 19, 2009
PubMed
Summary
This summary is machine-generated.

Glaucoma may cause selective optic nerve fiber loss. The reduced redundancy hypothesis suggests early detection requires considering fiber subpopulation sampling and loss amounts for better glaucoma diagnosis.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Vision Science

Background:

  • Glaucoma is characterized by progressive optic nerve damage.
  • Understanding optic nerve fiber loss patterns is crucial for early diagnosis.
  • Current diagnostic methods may not fully capture early functional deficits.

Purpose of the Study:

  • To review evidence on selective optic nerve fiber loss in glaucoma.
  • To question the selectivity of current glaucoma diagnostic tests.
  • To propose the reduced redundancy hypothesis for improved early detection.

Main Methods:

  • Histopathologic and psychophysical evidence review.
  • Analysis of optic nerve fiber subpopulation characteristics.
  • Development of the reduced redundancy hypothesis.

Main Results:

  • The selectivity of optic nerve fiber loss in glaucoma is debated.
  • A distinction is made between selective tests and selective losses.
  • The reduced redundancy hypothesis offers an alternative detection model.

Conclusions:

  • Early glaucoma detection requires considering optic nerve fiber subpopulation redundancy.
  • Psychophysical test design should incorporate fiber loss amounts and sampling properties.
  • The reduced redundancy hypothesis may enhance early functional loss identification in glaucoma.