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Related Experiment Videos

Pattern reversal visual evoked response and Snellen visual acuity

O Katsumi1, M C Mehta, E W Larson-Park

  • 1Clinical Research Unit, Schepens Eye Research Institute, Boston, MA 02114.

Graefe'S Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Fur Klinische Und Experimentelle Ophthalmologie
|May 1, 1994
PubMed
Summary
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Pattern-reversal visual evoked response (PVER) measures central retinal function and generally aligns with psychophysical tests. While PVER acuity often correlates with Snellen acuity (SA), significant individual variations exist, especially when PVER is non-recordable.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Electrophysiology

Background:

  • Pattern-reversal visual evoked response (PVER) assesses central retinal function.
  • PVER results typically show agreement with psychophysical tests like Snellen acuity (SA).
  • Understanding the correlation between PVER and SA is crucial for clinical diagnosis.

Purpose of the Study:

  • To compare visual acuities (VAs) calculated from PVER recordings with standard Snellen acuity (SA) measurements.
  • To evaluate the agreement between PVER-derived acuity and best-corrected VA across a wide range of visual function.
  • To identify potential discrepancies between PVER and SA in a large patient cohort.

Main Methods:

  • Compared PVER acuity (determined by critical check size) with best-corrected VA (measured via ETDRS chart) in 500 eyes.

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  • Analyzed PVER results across various critical check sizes (10 to 160 min of arc).
  • Included eyes with non-recordable PVER for comprehensive analysis.

    • Main Results:

    • PVER acuity generally agreed with SA, particularly at smaller check sizes.
    • Large deviations between PVER and SA were observed in specific subjects.
    • Eyes with non-recordable PVER showed a wide range of SA, averaging 20/1177.

    Conclusions:

    • PVER is a valuable tool for assessing central retinal function and correlates with SA.
    • Clinical application requires awareness of potential significant deviations between PVER and SA in certain individuals.
    • Further research may explore factors contributing to these observed discrepancies.