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Related Concept Videos

Glaucoma: Overview01:25

Glaucoma: Overview

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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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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.
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Angle Closure Glaucoma: Treatment01:28

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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 Pathways01:22

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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,...
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Anatomy of the Eyeball01:20

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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...
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Related Experiment Video

Updated: Aug 27, 2025

Translaminar Autonomous System Model for the Modulation of Intraocular and Intracranial Pressure in Human Donor Posterior Segments
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Higher susceptibility to central crowding in glaucoma.

Edouard Blanckaert1, Jean François Rouland1,2, Theophile Davost1

  • 1Department of Ophthalmology, Lille University Hospital, Hôpital Huriez, Lille, France.

Clinical & Experimental Optometry
|October 2, 2022
PubMed
Summary

Crowding significantly impacts vision in glaucoma patients, especially in central vision. Adjusting contrast and spacing can improve visual perception, aiding daily activities.

Keywords:
Central visioncontrastcrowdingglaucomaparafoveal vision

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Area of Science:

  • Ophthalmology
  • Visual Neuroscience
  • Perception Psychology

Background:

  • Glaucoma patients often exhibit reduced contrast sensitivity in central vision.
  • Impaired letter recognition at high contrast suggests factors beyond contrast sensitivity affect central perception.

Purpose of the Study:

  • To investigate the impact of crowding on central and parafoveal vision in glaucoma patients.
  • To determine how contrast and element spacing influence crowding effects.

Main Methods:

  • 17 glaucoma patients and 15 controls performed a central letter identification task.
  • Stimuli were presented centrally or parafoveally with varying contrast (60%, 5%) and spacing (isolated T or crowded with Hs).

Main Results:

  • Glaucoma patients showed increased crowding effects in central vision at low contrast.
  • Crowding effects were also observed in parafoveal vision for patients, dependent on contrast and spacing.
  • Spacing to escape crowding was greater at low contrast than high contrast.

Conclusions:

  • Crowding significantly impairs visual perception in glaucoma patients, particularly in central vision.
  • Visual field defects and reduced contrast sensitivity contribute to crowding susceptibility.
  • Manipulating contrast and spacing can mitigate crowding's negative effects, improving visual function.