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Related Experiment Videos

Perimetry: a need for standardization.

J P Schoessler, C A Uniacke

    American Journal of Optometry and Physiological Optics
    |October 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Perimetric instruments show variable luminance and testing conditions. Hemispheric-projection perimeters offer the most repeatable results for visual field testing.

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    Area of Science:

    • Ophthalmology
    • Visual Science
    • Medical Instrumentation

    Background:

    • Perimetry is crucial for diagnosing and monitoring visual field defects.
    • Variability in perimetric instrument performance can impact diagnostic accuracy.
    • Standardization of testing conditions is essential for reliable visual field assessment.

    Purpose of the Study:

    • To measure and compare luminance conditions across different perimetric instruments.
    • To identify inconsistencies in testing conditions among similar perimetric devices.
    • To evaluate the repeatability of test conditions provided by various perimeters.

    Main Methods:

    • Luminance measurements of targets and backgrounds were conducted.
    • Different types of perimetric instruments were assessed.

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  • Testing conditions for instruments of the same design were analyzed for uniformity.

    • Main Results:

    • Significant differences in luminance were observed between various perimetric instruments.
    • A lack of uniform testing conditions was evident, even for instruments of the same design.
    • Hemispheric-projection perimeters demonstrated the highest degree of repeatability in test conditions.

    Conclusions:

    • Luminance and testing condition variability pose challenges in perimetric assessments.
    • Standardization efforts are needed to ensure consistent performance across perimetric devices.
    • Hemispheric-projection perimeters represent a more reliable option for consistent visual field testing.