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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...
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...
Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.

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Related Experiment Video

Updated: Jul 11, 2026

Multifocal Electroretinograms
16:49

Multifocal Electroretinograms

Published on: December 4, 2011

Multifocal blue-on-yellow visual evoked potentials in early glaucoma.

Alexander Klistorner1, Stuart L Graham, Alessandra Martins

  • 1Department of Ophthalmology, Save Sight Institute, University of Sydney, Sydney, Australia.

Ophthalmology
|September 8, 2007
PubMed
Summary

Blue-on-yellow multifocal visual evoked potentials (mfVEPs) show 100% sensitivity and 95% specificity for detecting early glaucoma. This method is more sensitive than black-and-white mfVEPs for identifying visual field defects.

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Last Updated: Jul 11, 2026

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Full-Circle Cauterization of Limbal Vascular Plexus for Surgically Induced Glaucoma in Rodents

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Electrophysiology

Background:

  • Early glaucoma detection is crucial for preventing vision loss.
  • Standard automated perimetry (SAP) is a common method, but advanced electrophysiological tests can offer complementary diagnostic information.

Purpose of the Study:

  • To evaluate the diagnostic performance of blue-on-yellow multifocal visual evoked potentials (mfVEPs) compared to black-and-white mfVEPs and SAP in patients with early glaucoma.

Main Methods:

  • A cross-sectional study involving 50 early glaucoma patients and 60 healthy controls.
  • Both black-and-white and blue-on-yellow mfVEPs were recorded, alongside standard automated perimetry (SAP).
  • Analysis focused on mfVEP amplitude and latency in relation to visual field defects.

Main Results:

  • Blue-on-yellow mfVEP amplitude demonstrated 100% sensitivity in detecting glaucomatous defects, outperforming black-and-white mfVEPs (92.2% sensitivity).
  • A high topographic correspondence and significant correlation (r=0.73, P<0.0001) were found between blue-on-yellow mfVEP amplitude and SAP results.
  • Specificity for blue-on-yellow mfVEP amplitude was 95%, with 3 abnormal results in 60 control eyes.

Conclusions:

  • Blue-on-yellow mfVEP amplitude analysis is a highly sensitive and specific method for early glaucoma detection.
  • This technique shows promise as a valuable tool in the clinical diagnosis of early glaucoma.