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Computerized quantitative analysis of kinetic visual fields.

R G Weleber, W R Tobler

    American Journal of Ophthalmology
    |April 15, 1986
    PubMed
    Summary
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    Visual field assessment using kinetic perimetry can be improved. Measuring the solid angle of scotomas, rather than flat chart areas, provides a more accurate representation of visual field size.

    Area of Science:

    • Ophthalmology
    • Visual Science

    Background:

    • Kinetic perimetry is a standard method for visual field assessment.
    • Current methods quantify visual fields using area measurements on charts, which are prone to distortion.
    • These distortions arise from the azimuthal equidistant polar map projection used for visual field charts.

    Purpose of the Study:

    • To introduce a more accurate method for quantifying visual field size.
    • To address the limitations of traditional area measurements in kinetic perimetry.
    • To propose the solid angle in steradians as a superior metric for visual field representation.

    Main Methods:

    • Utilized a computer program to calculate the solid angle.
    • Applied the program to graphed perimetric visual field data.

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  • Determined the solid angle subtended by isopters representing scotomas or seeing areas.

    • Main Results:

    • Demonstrated that solid angle measurement corrects for cartographic distortions.
    • Showed that traditional area measurements can misrepresent scotoma size.
    • The solid angle provides a more geometrically accurate measure of visual field extent.

    Conclusions:

    • The solid angle is a more appropriate measure of visual field size than flat chart area.
    • This method offers improved accuracy in quantifying visual field defects and seeing areas.
    • Adoption of solid angle measurement can enhance the precision of kinetic perimetry assessments.