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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: May 14, 2026

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
07:11

Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential

Published on: May 25, 2020

Visual electrodiagnosis in glaucoma screening: a clinical study.

Konstantinos T Tsaousis1, Sotiris Plainis, Neil R A Parry

  • 1Institute of Vision and Optics (IVO), School of Health Sciences, University of Crete, Crete, Greece.

Journal of Glaucoma
|January 29, 2013
PubMed
Summary
This summary is machine-generated.

The pattern electroretinogram (pERG) A48/A480 ratio shows promise for early glaucoma diagnosis, outperforming pattern visual-evoked potentials (pVEP) in distinguishing patients from controls. This electrodiagnostic marker aids in identifying glaucoma early.

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

Published on: February 15, 2022

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Electrophysiology

Background:

  • Glaucoma is a leading cause of irreversible blindness.
  • Early diagnosis is crucial for effective management and vision preservation.
  • Current diagnostic methods may not detect subtle, early-stage glaucomatous changes.

Purpose of the Study:

  • To evaluate the diagnostic utility of pattern visual-evoked potentials (pVEP) and pattern electroretinograms (pERG).
  • To assess the efficacy of specific electrophysiological parameters in differentiating early glaucoma patients from healthy controls.
  • To investigate the A48/A480 ratio of pVEP and pERG as a potential biomarker for glaucoma.

Main Methods:

  • Included 38 patients (38 eyes), categorized into normal control (NC) and glaucoma patient (GP) groups.
  • Performed detailed ophthalmic examinations and steady-state pVEP and pERG electrodiagnostic tests.
  • Analyzed amplitudes of the second harmonic for pVEP and pERG responses to 480' (A480) and 48' (A48) check sizes, and their ratio (A48/A480).

Main Results:

  • No significant differences were found in pVEP amplitudes (A480, A48) between NC and GP groups.
  • The pVEP A48/A480 ratio was significantly higher in the NC group compared to the GP group.
  • While pERG amplitudes (A480, A48) showed no significant group differences, the pERG A48/A480 ratio was statistically significant between groups.

Conclusions:

  • The A48/A480 ratio derived from both steady-state pVEP and pERG may serve as a valuable indicator in glaucoma diagnosis.
  • The pERG A48/A480 ratio demonstrated significant differences, suggesting its potential as a sensitive marker for early glaucoma detection.
  • These electrophysiological measures, particularly the A48/A480 ratio, warrant further investigation for clinical application in early glaucoma screening.