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Related Experiment Videos

The visual evoked potential in acute primary angle closure glaucoma.

K W Mitchell1, C M Wood, J W Howe

  • 1Regional Medical Physics Department, Royal Victoria Infirmary, Newcastle upon Tyne.

The British Journal of Ophthalmology
|June 1, 1989
PubMed
Summary

Visual evoked potentials (VEPs) reveal abnormalities in most affected eyes of patients with primary angle closure glaucoma. Even fellow eyes without known pressure spikes show VEP changes, suggesting broader disease impact.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Electrophysiology

Background:

  • Primary angle closure glaucoma (PACG) is a significant cause of vision loss.
  • Understanding the subclinical impact of PACG on visual pathways is crucial for early detection and management.

Purpose of the Study:

  • To investigate the utility of visual evoked potentials (VEPs) in detecting visual pathway dysfunction in patients with a history of acute PACG.
  • To compare VEP abnormalities with clinical signs of optic nerve damage in affected and fellow eyes.

Main Methods:

  • VEPs were recorded from 29 patients with a history of acute PACG.
  • Multiple VEP parameters including latency, amplitude, contrast threshold, and slope were analyzed.
  • Affected eyes and fellow eyes (without known pressure rise history) were assessed.

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Main Results:

  • 72.4% of affected eyes exhibited abnormal VEP measures, exceeding the 41.4% showing obvious optic nerve damage.
  • Notably, 48.1% of fellow eyes also displayed VEP abnormalities.
  • VEP alterations were observed even in eyes without overt signs of optic nerve damage.

Conclusions:

  • VEP abnormalities are prevalent in both affected and fellow eyes of PACG patients, indicating widespread visual pathway involvement.
  • VEPs may serve as a sensitive indicator for subclinical dysfunction in PACG, potentially preceding optic nerve damage.
  • The findings support the hypothesis that PACG impacts visual pathways beyond the directly affected optic nerve.