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Convergence accommodation: laboratory and clinical evaluation.

B Wick1, D Currie

  • 1College of Optometry, University of Houston, Texas.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|March 1, 1991
PubMed
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Convergence accommodation (CA/C) was measured, showing it decreases with reduced accommodative amplitude. This finding suggests CA/C significantly contributes to the near accommodative response in many patients.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • The relationship between convergence and accommodation is crucial for clear binocular vision.
  • Previous studies have reported varying degrees of nonlinearity in the accommodative response to convergence.

Purpose of the Study:

  • To measure convergence accommodation (CA/C) under both laboratory and clinical conditions.
  • To investigate the relationship between CA/C and accommodative amplitude.
  • To compare findings with existing literature.

Main Methods:

  • CA/C was measured in subjects under controlled laboratory settings.
  • CA/C was also assessed in a clinical environment.
  • Accommodative amplitude was determined for each subject.

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Main Results:

  • A small nonlinearity in CA/C ratios was observed in three out of six subjects under laboratory conditions.
  • Convergence accommodation was found to decrease as accommodative amplitude decreased.
  • The rate of decrease in CA/C was slower than previously reported in the literature.

Conclusions:

  • Convergence accommodation plays a substantial role in the overall near accommodative response.
  • The observed nonlinearity warrants further investigation.
  • Current findings suggest a significant contribution of CA/C to visual function in patients.