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Visual acuity prediction using the VER--temporal aspects.

W A Douthwaite1, T C Jenkins, A J Taylor

  • 1School of Studies in Optometry, University of Bradford, West Yorkshire, England.

American Journal of Optometry and Physiological Optics
|December 1, 1987
PubMed
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Visually evoked responses (VERs) correlate well with visual acuity at 3 and 6 pattern reversals per second. Higher reversal rates show a weaker correlation, indicating reduced reliability for assessing visual function.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Visual Science

Background:

  • Assessing visual acuity is crucial for diagnosing and monitoring visual impairments.
  • Visually evoked responses (VERs) offer an objective measure of visual pathway function.
  • Understanding the relationship between VERs and subjective visual acuity is essential for clinical applications.

Purpose of the Study:

  • To investigate the correlation between visually evoked responses (VERs) and subjective visual acuity.
  • To determine the optimal pattern reversal rate for eliciting reliable VERs.
  • To assess the repeatability of VER amplitude measurements.

Main Methods:

  • Pattern reversal stimuli (5.5 min arc check size) were used to record VERs in 30 subjects.
  • VER peak-to-trough amplitude was measured at 3, 6, and 12 pattern reversals per second.

Related Experiment Videos

  • Correlation coefficients between VER amplitude and Landolt C visual acuity were calculated.

    • Main Results:

    • High correlation coefficients (r = 0.81) were observed between VER amplitude and visual acuity at 3 and 6 reversals per second.
    • A lower correlation (r = 0.54) was found at 12 reversals per second.
    • Repeatability measurements showed a 13% coefficient of variation for VER amplitude at 3 reversals per second over 5 weeks.

    Conclusions:

    • VERs elicited by pattern reversal stimuli show good correlation with subjective visual acuity at lower reversal rates (3 and 6 Hz).
    • Higher reversal rates (12 Hz) yield less reliable correlations, suggesting limitations for accurate visual acuity assessment.
    • VER measurements demonstrate good repeatability, supporting their potential use in clinical settings for visual function evaluation.