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Related Experiment Videos

Static and kinetic visual field testing. Reproducibility in normal volunteers.

R K Parrish, J Schiffman, D R Anderson

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |October 1, 1984
    PubMed
    Summary

    Visual field testing shows significant variability. Most individuals exhibit localized areas of reduced sensitivity, and automated kinetic perimetry reveals deviations in isopter position, necessitating retesting to confirm true defects.

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    Area of Science:

    • Ophthalmology
    • Visual Neuroscience
    • Medical Imaging

    Background:

    • Visual field testing is crucial for diagnosing and monitoring optic nerve and retinal diseases.
    • Understanding the normal variability in visual field measurements is essential for accurate interpretation.
    • Automated perimetry aims to standardize visual field assessment, but inherent variability persists.

    Purpose of the Study:

    • To quantify the standard deviation (SD) of static visual thresholds across different retinal eccentricities.
    • To assess the variability of isopter positions using automated kinetic perimetry.
    • To identify the prevalence of localized deviations in visual fields that may mimic scotomas.

    Main Methods:

    • Static visual field testing was performed at various points from fixation to 30 degrees.

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  • Automated kinetic perimetry was employed to measure isopter positions.
  • Standard deviation (SD) was calculated for static thresholds and kinetic isopter positions.

    • Main Results:

    • The SD of static visual threshold ranged from 0.12 log units near fixation to 0.41 log units at 30 degrees.
    • Approximately 10% of tested points showed a sensitivity reduction of 0.5 log units compared to adjacent points.
    • Automated kinetic perimetry revealed an SD of isopter position from 2.6 to 5.5 degrees, with greater variability in the temporal field.
    • Over 10% of points exhibited an inward deviation of 5 degrees or more from their neighboring points.

    Conclusions:

    • Significant inter-individual variability exists in both static and kinetic visual field testing.
    • Localized areas of reduced sensitivity are common and can simulate scotomas, requiring careful interpretation.
    • Automated kinetic perimetry shows variability, particularly in the temporal visual field, necessitating retesting to differentiate artifacts from true defects and accurately assess progression.