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Related Experiment Videos

Stereoacuity and binocular visual acuity in prism-induced exodeviation.

Philip W Laird1, Sarah R Hatt, David A Leske

  • 1Mayo Medical School, Rochester, Minnesota 55905, USA.

Journal of AAPOS : the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
|April 10, 2007
PubMed
Summary
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In intermittent exotropia, fine stereoacuity recovers gradually when binocular vision is restored under convergence stress. This gradual stereoacuity recovery was not linked to reduced binocular visual acuity.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Vision Science

Background:

  • Intermittent exotropia (IXT) control involves accommodative and motor convergence.
  • Reduced binocular visual acuity in IXT may stem from accommodation needed to manage eye deviation.

Purpose of the Study:

  • To investigate if the shift from non-fused to fused vision involves a gradual or immediate change in stereoacuity and binocular visual acuity.
  • To test the hypothesis that accommodation is responsible for reduced binocular visual acuity in IXT by simulating convergence stress.

Main Methods:

  • Induced convergence stress in 25 visually normal adults using base-out prisms.
  • Measured stereoacuity (Frisby Davis Distance [FD2], Distance Randot [DR]) and binocular visual acuity at varying prism diopters.
  • Categorized stereoacuity recovery as immediate or gradual.

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Main Results:

  • 96% of participants exhibited gradual recovery of fine stereoacuity.
  • Median binocular visual acuity remained stable at 20/15 throughout fusion levels.

Conclusions:

  • The transition to fused vision under convergence stress typically involves a gradual recovery of fine stereoacuity.
  • The lack of decreased binocular visual acuity suggests accommodative convergence may not be essential for maintaining binocularity under stress.