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[Comparison between dissociated and associated heterophoria].

M Kromeier1, C Schmitt, M Bach

  • 1Abteilung Neuroophthalmologie und Schielbehandlung, Universitäts-Augenklinik Freiburg, Killianstrasse 5, 79106 Freiburg.

Der Ophthalmologe : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
|August 1, 2002
PubMed
Summary

This study found a high correlation between dissociated heterophoria and associated heterophoria, suggesting both are valuable for prescribing prisms. Dissociated heterophoria remains the primary indicator in rare cases of obligate fixation disparity.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Context:

  • Heterophoria, a deviation in eye alignment, is classified as dissociated or associated.
  • Both types have been used to guide prismatic correction, but their comparability is debated.

Purpose:

  • To compare measurements of dissociated heterophoria and associated heterophoria.
  • To determine if these two measures are comparable for guiding prismatic spectacle correction.

Summary:

  • A study of 43 subjects used the white Maddox rod test for dissociated heterophoria and the cross test for associated heterophoria.
  • A high correlation (r=0.89) was found between the two tests, indicating strong agreement.
  • One subject with obligate fixation disparity could not be assessed with the cross test.

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Impact:

  • The findings suggest dissociated and associated heterophoria are of equal value for prismatic correction indications.
  • Dissociated heterophoria remains the sole reliable indicator in rare cases of obligate fixation disparity.