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Minimal angle horizontal strabismus detectable by lay observers.

Erik Weissberg1, Melissa Suckow, Frank Thorn

  • 1New England College of Optometry, 424 Beacon Street, Boston, MA 02115, USA. weissberg@ne-optometry.edu

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|July 15, 2004
PubMed
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Lay observers can detect exotropia at smaller angles than esotropia. This study defines the critical magnitude of eye turns for social significance in strabismus detection.

Area of Science:

  • Ophthalmology
  • Perception Psychology

Background:

  • Socially significant strabismus can lead to psychosocial issues.
  • The precise magnitude of strabismus considered socially significant is not well-defined.
  • Existing literature offers criteria but rarely references them.

Purpose of the Study:

  • To determine the magnitude at which strabismus becomes socially significant based on lay observer perception.
  • To investigate lay observers' ability to detect different magnitudes of exotropia and esotropia.

Main Methods:

  • Simulated strabismus using photo manipulation with horizontal deviations from 3 to 24 prism diopters (Delta).
  • Presented randomized photos to 58 non-health care professionals for detection of an eye turn.
  • Analyzed detection rates using chi-squared tests.

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Main Results:

  • Detection likelihood increased with larger deviation angles for both exotropia and esotropia.
  • Exotropia was more easily detected by lay observers than esotropia.
  • Critical magnitudes for 70% detection were 8 Delta for exotropia and 14.5 Delta for esotropia.

Conclusions:

  • Exotropia is detected at smaller angles (8 Delta) than esotropia (14.5 Delta) by lay observers.
  • Findings challenge the common belief that esotropia is more easily detected.
  • Further research should explore ethnicity, sex, age, and use diverse models for generalizability.