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Large-sample norms for contrast sensitivity.

A P Ginsburg, D W Evans, M W Cannon

    American Journal of Optometry and Physiological Optics
    |February 1, 1984
    PubMed
    Summary
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    This study developed a portable instrument to measure contrast sensitivity functions (CSFs) in a large population. The device demonstrated reliable results for static and dynamic vision assessments.

    Area of Science:

    • Vision Science
    • Ophthalmology
    • Human Factors

    Background:

    • Contrast sensitivity is crucial for visual performance.
    • Assessing contrast sensitivity functions (CSFs) typically requires specialized equipment.
    • A need exists for portable, automated methods to measure CSFs in diverse settings.

    Purpose of the Study:

    • To evaluate a novel portable, microprocessor-controlled instrument for measuring static and dynamic contrast sensitivity functions (CSFs).
    • To assess the reliability and repeatability of the instrument in a real-world setting with a large sample size.

    Main Methods:

    • A portable, microprocessor-controlled instrument was utilized to automatically measure CSFs.
    • Static and dynamic CSFs were assessed in 265 observers from a normal population.

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  • Repeatability was assessed by re-measuring six observers after a 6-month interval.

    • Main Results:

    • The instrument successfully measured static and dynamic CSFs in a large, normal population.
    • Repeat measurements after 6 months showed minimal, non-systematic variations.
    • Median CSF values and 75-90% confidence intervals for the sample were determined.

    Conclusions:

    • The portable instrument provides reliable and repeatable measurements of contrast sensitivity functions (CSFs).
    • This automated device is suitable for assessing visual function in field settings.
    • The study provides normative data for static and dynamic CSFs in a general population.