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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...

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Related Experiment Video

Updated: Jun 30, 2026

Simultaneous Recording of Electroretinography and Visual Evoked Potentials in Anesthetized Rats
10:30

Simultaneous Recording of Electroretinography and Visual Evoked Potentials in Anesthetized Rats

Published on: July 1, 2016

Update on the pattern electroretinogram in glaucoma.

Michael Bach1, Michael B Hoffmann

  • 1Sektion Funktionelle Sehforschung, Universitäts-Augenklinik Freiburg, Germany. michael.bach@uni-freiburg.de

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|June 4, 2008
PubMed
Summary
This summary is machine-generated.

The pattern electroretinogram (PERG) effectively detects early glaucoma by identifying retinal ganglion cell dysfunction before visual field changes occur. This electrophysiological test aids in diagnosing incipient glaucoma in patients with elevated intraocular pressure.

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10:10

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

Published on: February 15, 2022

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Electrophysiology

Background:

  • Glaucoma is a progressive optic neuropathy characterized by retinal ganglion cell loss.
  • Early diagnosis is crucial for preventing irreversible vision loss.
  • Current diagnostic methods may not detect subtle, early functional changes.

Purpose of the Study:

  • To review the efficacy of the pattern electroretinogram (PERG) for the early diagnosis of glaucoma.
  • To assess PERG's sensitivity as a biomarker for retinal ganglion cell function in glaucoma.
  • To explore PERG's utility in identifying incipient glaucoma before visual field defects manifest.

Main Methods:

  • Analysis of PERG parameters including P50, N95, N95/P50 ratio, and Fourier steady-state responses.
  • Evaluation of stimulation parameters such as check size and temporal frequency.
  • Exploration of the correlation between PERG findings and visual field defects.

Main Results:

  • PERG is significantly altered in glaucoma, showing amplitude reductions even in unaffected visual field areas.
  • Higher temporal frequencies (>10 reversals/s) enhance PERG sensitivity for glaucoma detection.
  • The "PERG ratio" (amplitude ratio for different check sizes) effectively identifies early glaucoma and reduces variability.
  • Longitudinal studies indicate PERG can detect incipient glaucoma damage preceding visual field evidence.

Conclusions:

  • The pattern electroretinogram is a sensitive electrophysiological biomarker for retinal ganglion cell function.
  • Optimized PERG paradigms can identify patients with elevated intraocular pressure and incipient glaucoma damage.
  • PERG assists in early glaucoma diagnosis, potentially before changes in the visual field become apparent.