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Accommodation to large disparity stereograms.

Helen Davis1, David Buckley, Ruth E G Jacobs

  • 1Academic Unit of Ophthalmology and Orthoptics, Medical School, and the Department of Psychology, University of Sheffield, Sheffield, United Kingdom. h.davis@sheffield.ac.uk

Journal of AAPOS : the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
|December 31, 2002
PubMed
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Observers showed significant accommodation changes to stereoscopic depth, but less than predicted. The amount of accommodation was not linked to the perceived depth in stereograms.

Area of Science:

  • Vision Science
  • Ophthalmology
  • Psychophysics

Background:

  • Previous research indicates small accommodation responses to stereoscopic depth.
  • The current study investigates a wider range of depths and the role of depth judgment.

Purpose of the Study:

  • To determine if observers accommodate to stereoscopic depth in large disparity stereograms.
  • To assess the relationship between accommodation amount and perceived depth.

Main Methods:

  • Accommodation was measured using an autorefractor in emmetropic observers viewing stereograms and real targets at varying depths.
  • Observers also performed depth judgments on stereoscopic stimuli after training.

Main Results:

  • Significant accommodation responses to stereoscopic targets were observed, averaging approximately 60% of predicted values.

Related Experiment Videos

  • Individual accommodation differences were not correlated with perceived depth magnitude.

    • Conclusions:

    • Accommodation does occur in response to stereoscopic depth but is generally less than predicted and less than for real targets.
    • Findings have implications for the use of stereograms in clinical vision assessments.