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Related Experiment Videos

Interocular differences of the visual field in normal subjects.

R S Brenton, C D Phelps, P Rojas

    Investigative Ophthalmology & Visual Science
    |May 1, 1986
    PubMed
    Summary

    Comparing visual fields between eyes helps detect abnormalities. In normal individuals, visual fields show high symmetry, with significant differences rarely exceeding 6 decibels.

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    Area of Science:

    • Ophthalmology
    • Neuroscience
    • Medical Imaging

    Background:

    • Assessing visual field abnormalities often involves comparing the affected eye's results to the unaffected eye.
    • This comparison relies on the assumption of symmetry between the two visual fields in healthy individuals.

    Purpose of the Study:

    • To quantify the degree of normal symmetry in central visual fields between the two eyes.
    • To establish normative data for interocular sensitivity differences in healthy subjects.

    Main Methods:

    • Examined central visual fields of 20 healthy subjects using program 30-2 on the Humphrey perimeter.
    • Analyzed interocular sensitivity differences at individual test locations and overall mean sensitivity.

    Main Results:

    • Interocular sensitivity differences ranged from 0 to 9 decibels, with larger differences more common in the upper visual field.
    • Normal asymmetry exceeding 6 decibels at single locations is predicted in less than 1% of test points.
    • Overall mean sensitivity asymmetry exceeding 1.4 decibels is predicted in less than 1% of normal subjects.

    Conclusions:

    • Establishes quantitative benchmarks for normal visual field symmetry.
    • Provides a basis for identifying significant interocular differences indicative of pathology.
    • Highlights the importance of normative data in interpreting visual field test results.

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