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Related Experiment Videos

Relation between distance heterophoria and tonic vergence.

W F O'Shea1, K J Ciuffreda, S K Fisher

  • 1Schnurmacher Institute for Vision Research, State College of Optometry, State University of New York, New York.

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

Distance heterophoria measurements using von Graefe and Maddox rod methods were more divergent than tonic vergence. This difference is attributed to accommodative divergence, with equations developed to predict tonic vergence from phoria.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Heterophoria, the tendency for eyes to deviate when fusion is broken, is a common clinical finding.
  • Understanding the relationship between heterophoria and tonic vergence is crucial for diagnosing and managing binocular vision disorders.
  • Previous research suggests a link between accommodative status and phoria, but precise quantification remains an area of interest.

Purpose of the Study:

  • To compare distance heterophoria measurements obtained via von Graefe and Maddox rod techniques with tonic vergence.
  • To investigate the influence of illumination conditions on these measurements.
  • To elucidate the role of accommodative divergence in the observed differences between phoria and tonic vergence.

Main Methods:

Related Experiment Videos

  • Distance heterophoria was assessed using the von Graefe and Maddox rod clinical procedures.
  • Measurements were conducted under both standard reduced illumination and complete darkness.
  • Tonic vergence was measured exclusively in total darkness.

    • Main Results:

    • Phoria measures (von Graefe and Maddox rod) were consistently more divergent than tonic vergence.
    • The von Graefe method yielded a more divergent phoria measurement compared to the Maddox rod.
    • The divergence difference between phoria and tonic vergence is hypothesized to stem from accommodative divergence.

    Conclusions:

    • Accommodative divergence, resulting from a reduction in accommodation relative to the tonic level for distance targets, likely explains the discrepancy between phoria and tonic vergence.
    • The findings support the development of predictive equations for tonic vergence based on phoria values.
    • Clinical implications include a better understanding of binocular vision anomalies and potential refinement of diagnostic criteria.