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Related Experiment Videos

Ball-bearing keratometry.

R J Schechter

    American Journal of Ophthalmology
    |May 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Steel test balls for keratometer calibration were created affordably using standard ball bearings. These custom balls offer high accuracy, exceeding one part in 1,000, for precise optical instrument calibration.

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    Area of Science:

    • Optical engineering
    • Metrology

    Background:

    • Accurate calibration of keratometers is essential for reliable eye measurements.
    • Commercially available calibration tools can be expensive.

    Purpose of the Study:

    • To develop a cost-effective method for creating accurate steel test balls for keratometer calibration.
    • To assess the accuracy of calibration balls made from readily available ball bearings.

    Main Methods:

    • Selected steel ball bearings, intended for non-optical applications, were utilized.
    • These ball bearings were prepared and validated as test balls for keratometer calibration.

    Main Results:

    • Steel test balls were successfully obtained at a nominal cost.
    • The developed test balls demonstrated an accuracy greater than one part in 1,000.

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    Conclusions:

    • Standard steel ball bearings provide a viable and economical source for high-accuracy keratometer calibration balls.
    • This method offers a practical solution for achieving precise optical metrology without significant expense.