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Prism adaptation without binocular vision.

W L Larson1

  • 1School of Optometry, University of Montreal, Quebec, Canada.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|March 1, 1990
PubMed
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Prism adaptation can occur even when binocular vision is dissociated, challenging previous assumptions. This finding suggests adaptation may happen during heterophoria measurement using variable prisms.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Vision Science

Background:

  • Vergence adaptation is crucial for maintaining binocular vision.
  • Previous research assumed adaptation only occurs during single binocular vision.

Purpose of the Study:

  • To investigate prism adaptation during dissociated binocular vision.
  • To evaluate adaptation's effect on lateral heterophoria.

Main Methods:

  • Subjects wore prisms while binocular fusion was dissociated.
  • Heterophoria was measured using an automated Duane's screen and parallax test.
  • Adaptation was assessed by changes in lateral heterophoria.

Main Results:

  • Preliminary study: at least 25% of subjects adapted to prisms (4 delta base-out at 6m, 3 delta base-in at 50cm).

Related Experiment Videos

  • Further investigation confirmed prism adaptation can occur.
  • Prism power could be provided by the phoria test's variable prism, suggesting adaptation during measurement.

    • Conclusions:

    • Prism adaptation is not limited to single binocular vision.
    • Adaptation may occur when measuring heterophoria with variable prisms.
    • Challenges the necessity of fused single vision for vergence adaptation.