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Related Experiment Videos

Prism adaptation and viewing distance.

R V North1, B Sethi, K Owen

  • 1Laboratory of Experimental Optometry, University of Wales, College of Cardiff, UK.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|January 1, 1990
PubMed
Summary
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Subjects with normal vision adapt differently to horizontal prisms. Adaptation to base out prisms is greater at distance, but near adaptation is symmetrical, suggesting asymmetrical visual system responses.

Area of Science:

  • Ophthalmology
  • Vision Science
  • Neuroscience

Background:

  • Normal binocular vision allows adaptation to prism-induced phorias.
  • Conflicting reports exist regarding adaptation magnitude to horizontal prisms (base out vs. base in).
  • Previous research shows inconsistent adaptation responses to base out prisms.

Purpose of the Study:

  • To investigate horizontal prism adaptation at distance and near.
  • To clarify asymmetrical adaptation responses to horizontal prisms in subjects with normal binocular vision.

Main Methods:

  • Study included 40 subjects with normal binocular vision.
  • Investigated prism adaptation responses at both distance and near viewing conditions.
  • Utilized horizontal prisms to induce phorias and measured adaptation.

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Main Results:

  • Confirmed previous findings of asymmetrical adaptation at distance.
  • Observed significantly greater adaptation to base out prisms compared to base in prisms at distance.
  • Found virtually symmetrical adaptation responses to horizontal prisms at near.

Conclusions:

  • Visual system adaptation to horizontal prisms is asymmetrical at distance, favoring base out prism adaptation.
  • Near viewing conditions result in symmetrical adaptation to horizontal prisms.
  • Asymmetrical adaptation at distance may be due to specific visual processing mechanisms.