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Related Experiment Videos

Strabismus measurements using the alternating and simultaneous prism cover tests: a comparative study.

M A Deacon1, F Gibson

  • 1Orthoptic Department, The General Infirmary at Leeds, United Kingdom.

Journal of Pediatric Ophthalmology and Strabismus
|October 6, 2001
PubMed
Summary

The simultaneous and alternating prism cover test is the most accurate method for measuring constant manifest esotropia. This method provides a quantitative measurement when cover tests show a qualitative change in the angle of deviation.

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Area of Science:

  • Ophthalmology
  • Vision Science

Background:

  • Strabismus, specifically constant manifest esotropia, requires accurate measurement for effective management.
  • Traditional cover tests may not fully capture the complexity of the angle of deviation.

Purpose of the Study:

  • To identify the most accurate method for measuring strabismus in patients with constant manifest esotropia.
  • To compare the quantitative measurements of different cover test variations.

Main Methods:

  • Patients with constant manifest esotropia underwent standard cover tests (cover-uncover and alternating cover test).
  • The simultaneous and alternating prism cover test was employed to quantify deviations.
  • Binocular vision was assessed using Bagolini striated lenses and motor fusion responses.

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Main Results:

  • A significant difference was observed between alternating and simultaneous prism cover test measurements (mean difference: 4.72 prism diopters).
  • For patients with a qualitative change in deviation on cover tests, the difference was more pronounced (mean difference: 7.42 prism diopters).

Conclusions:

  • The simultaneous and alternating prism cover test is crucial for accurate esotropia measurement when cover tests indicate a change in deviation.
  • Investigating binocular reflexes is recommended even with large manifest angles, as a latent component may be present.