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Related Experiment Videos

[Quantitation of the visual field].

R Etienne, E Sellem

    Journal Francais D'Ophtalmologie
    |January 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Quantifying visual field loss using a deficit ratio simplifies tracking disease progression in conditions like Primary Open Angle Glaucoma. This percentage score offers a clearer understanding for both clinicians and patients.

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    Area of Science:

    • Ophthalmology
    • Medical Technology

    Background:

    • Traditional kinetic perimetry yielded complex visual field charts, making quantitative analysis difficult.
    • Isopters, representing visual field boundaries, lacked geometric regularity, hindering precise measurement.

    Observation:

    • Three-dimensional computerized perimetry allows for quantitative evaluation of visual field printouts.
    • The Peritest system facilitates the calculation of a 'deficit ratio' for visual field defects.

    Findings:

    • A deficit ratio provides a percentage score of visual field volume defects, classifying and summing scores from individual defects.
    • This method is applicable to various perimeters, including the Visual Field Analyser.
    • Testing each point twice per examination helps assess patient response fluctuation and establish individual variation ranges.

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    Implications:

    • The deficit ratio simplifies monitoring disease progression in conditions like Primary Open Angle Glaucoma compared to analyzing multiple visual field printouts.
    • Communicating visual field loss as a percentage deficit ratio enhances patient comprehension of their condition.
    • Establishing measurable metrics for visual field loss aligns with scientific principles of quantification.