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Related Experiment Videos

Axial length and the Hirschberg test

A J Carter, N Roth

    American Journal of Optometry and Physiological Optics
    |June 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    The Hirschberg ratio, used to estimate eye alignment, showed a weak correlation with axial length. A new mean value of 24 prism diopters/mm suggests revising traditional clinical ratios.

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    Area of Science:

    • Ophthalmology
    • Optometry
    • Strabismus

    Background:

    • The Hirschberg ratio is a clinical estimation of eye alignment.
    • Traditional ratios may not accurately reflect individual eye characteristics.

    Purpose of the Study:

    • To investigate the correlation between Hirschberg ratios and ocular axial length.
    • To evaluate the accuracy of traditional Hirschberg ratios in clinical practice.

    Main Methods:

    • Ultrasonography was used to measure axial lengths in 30 eyes (15 subjects).
    • Photographs were taken under monocular fixation, varying gaze by 2-degree steps over an 8-degree range.
    • Hirschberg ratios were calculated from these photographs.

    Main Results:

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  • A low correlation (0.07) was found between Hirschberg ratios and axial length.
  • The mean Hirschberg ratio was 24 prism diopters per millimeter (SD = 7).

    • Conclusions:

    • Current Hirschberg ratio values (12 or 14/1) may be inaccurate.
    • A revised ratio of 22/1 is suggested for better clinical application.
    • Axial length is not a reliable predictor of the Hirschberg ratio.