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Related Experiment Videos

First-order Wiener kernel visually evoked potentials obtained from multiple sclerosis patients.

D V Schoon1, E K Wong

  • 1Department of Ophthalmology, University of California, Irvine.

Documenta Ophthalmologica. Advances in Ophthalmology
|January 1, 1987
PubMed
Summary
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Visually evoked potentials (VEP) in multiple sclerosis patients reveal differing responses to check size. Normal vision shows increased VEP amplitude with smaller checks, while reduced vision shows the opposite.

Area of Science:

  • Neuroscience
  • Ophthalmology

Background:

  • Multiple sclerosis (MS) can cause visual impairment.
  • Visually evoked potentials (VEP) are a measure of visual pathway function.

Purpose of the Study:

  • To investigate the relationship between VEP amplitude and stimulus size in MS patients.
  • To correlate VEP findings with Snellen visual acuity.

Main Methods:

  • VEPs were recorded from MS patients using reversing check stimuli of five different sizes.
  • Random binary sequence triggering and cross-correlation were used to estimate the linear system response.
  • Correlation coefficients were calculated to assess the relationship between check size and VEP amplitude.

Main Results:

  • Eyes with normal visual acuity (20/20) showed increased VEP amplitude with smaller checks (correlation -0.6 to -1 in 63%).

Related Experiment Videos

  • Eyes with reduced visual acuity (≤20/70) showed decreased VEP amplitude with smaller checks (correlation +0.6 to +1 in 45%).
  • The check size yielding the largest VEP amplitude showed a weaker correlation with visual acuity.

    • Conclusions:

    • VEP response patterns to varying check sizes differ between MS patients with normal and impaired vision.
    • VEP analysis may offer insights into visual pathway dysfunction in multiple sclerosis.