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Reduced stereoacuity as a predictor for clinically significant convergence insufficiency.

Ari Leshno1,2, Chaim Stolovitch2,3, Ofira Zloto1,2

  • 1Goldschleger Eye Institute, Sheba Medical Center, Tel Hashomer, Israel.

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|March 20, 2020
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Summary

Convergence insufficiency (CI) significantly impacts children's stereoacuity. Improving convergence ability enhances normal stereoacuity, suggesting CI evaluation is crucial for diagnosing poor stereoacuity.

Keywords:
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Area of Science:

  • Ophthalmology
  • Pediatric Optometry
  • Binocular Vision

Background:

  • Stereoacuity, essential for depth perception, depends on precise binocular alignment.
  • Convergence insufficiency (CI) is a common binocular motor disorder affecting near vision tasks.

Purpose of the Study:

  • To determine the relationship between convergence amplitude (CA) and stereoacuity in a large pediatric population.
  • To assess the impact of CI on stereoacuity outcomes.

Main Methods:

  • A retrospective chart review of 2200 patients aged 6-17 years, excluding those with amblyopia, strabismus, or reduced visual acuity.
  • Stereoacuity was measured using the Randot test, and convergence amplitude (CA) was assessed via base-out prism bar measurements.

Main Results:

  • A significant positive association was found between improved convergence ability and normal stereoacuity (p<0.001).
  • Convergence insufficiency (CI) was strongly linked to reduced stereoacuity (OR 1.86, p<0.001).
  • In a subgroup treated for CI, normal stereoacuity increased from 29% to 76% post-treatment (p=0.006).

Conclusions:

  • Convergence amplitude significantly influences stereoacuity in children.
  • Evaluating CA is essential for children presenting with poor stereoacuity, particularly when other causes are ruled out.
  • Further research into the efficacy of convergence improvement exercises for enhancing stereoacuity is warranted.