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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...
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...
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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Related Experiment Video

Updated: Jul 11, 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

Dichoptic stimulation improves detection of glaucoma with multifocal visual evoked potentials.

Hemamalini Arvind1, Alexander Klistorner, Stuart Graham

  • 1Save Sight Institute, University of Sydney, Sydney, Australia. hemamalini_arvind@yahoo.com

Investigative Ophthalmology & Visual Science
|September 28, 2007
PubMed
Summary

Simultaneous binocular (dichoptic) stimulation for multifocal visual evoked potentials (mfVEP) detects glaucoma defects and reduces testing time. This method may identify early glaucomatous defects missed by other tests.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Science

Background:

  • Glaucoma is a leading cause of irreversible blindness worldwide.
  • Early detection of glaucomatous defects is crucial for preserving vision.
  • Current diagnostic methods like Humphrey visual field (HFA) testing have limitations in detecting early-stage disease.

Purpose of the Study:

  • To evaluate the efficacy of simultaneous binocular (dichoptic) stimulation for multifocal visual evoked potentials (mfVEP) in detecting glaucomatous visual field defects.
  • To assess whether dichoptic mfVEP reduces intereye variability compared to monocular mfVEP.
  • To determine if dichoptic mfVEP can identify early glaucomatous defects not apparent on standard visual field testing.

Main Methods:

  • Twenty-eight glaucoma patients and 30 healthy controls underwent mfVEP testing.
  • mfVEP was performed using both monocular (sequential eye recording) and dichoptic (simultaneous binocular stimulation via VR goggles) methods.
  • Recording time for dichoptic mfVEP was 7 minutes, compared to 10 minutes for monocular mfVEP.

Main Results:

  • Dichoptic mfVEP testing showed significantly lower intereye asymmetry (RAC) in healthy subjects compared to monocular testing.
  • All Humphrey visual field (HFA) scotomas in glaucoma patients were detected by dichoptic mfVEP.
  • Dichoptic mfVEP identified defects in five hemifields that were normal on HFA and monocular mfVEP, correlating with observed rim changes.

Conclusions:

  • Simultaneous binocular (dichoptic) mfVEP is effective in detecting glaucomatous visual field losses.
  • This technique may identify early glaucomatous defects missed by HFA and monocular mfVEP.
  • Dichoptic mfVEP offers a potential new tool for early glaucoma detection, reducing testing time by 30%.