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Related Experiment Videos

The Hirschberg test: a double-masked clinical evaluation.

J B Eskridge1, B Wick, D Perrigin

  • 1School of Optometry, University of Alabama, Birmingham.

American Journal of Optometry and Physiological Optics
|September 1, 1988
PubMed
Summary

The Hirschberg test accurately measures ocular deviation in strabismic patients of all ages. The study recommends using the 1 mm = 22 prism diopter formula for precise measurements.

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Area of Science:

  • Ophthalmology
  • Strabismus Diagnosis
  • Clinical Measurement

Background:

  • The Hirschberg test is a long-standing clinical method for assessing ocular alignment.
  • Variability exists in recommended formulas for quantifying ocular deviation using the Hirschberg test.

Purpose of the Study:

  • To conduct a double-masked clinical evaluation of the Hirschberg test's efficacy.
  • To determine the most accurate formula for calculating ocular deviation via the Hirschberg test.

Main Methods:

  • A double-masked study involving strabismic patients of all ages.
  • Comparison of results from the alternate cover test and a photographic Hirschberg procedure.
  • Evaluation by two independent investigators to ensure blinding.

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Main Results:

  • The Hirschberg test is applicable to strabismic patients across all age groups.
  • The formula '1 mm = 22 prism diopters' demonstrated the highest accuracy in measurements.
  • The double-masked protocol validated the reliability of the photographic Hirschberg procedure.

Conclusions:

  • The Hirschberg test remains a valuable tool for evaluating ocular deviations in strabismus.
  • Standardizing on the '1 mm = 22 prism diopters' formula is recommended for clinical practice.
  • Photographic Hirschberg procedures, when conducted in a double-masked manner, provide reliable data.