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Related Experiment Videos

Effect of surround propinquity on the open-loop accommodative response.

M Rosenfield1, K J Ciuffreda

  • 1Department of Vision Sciences, SUNY/State College of Optometry, New York 10010.

Investigative Ophthalmology & Visual Science
|January 1, 1991
PubMed
Summary

Knowledge of room size influences eye accommodation in darkness. Awareness of smaller spaces increased accommodative response, suggesting proximal cues impact visual perception.

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Area of Science:

  • Ophthalmology
  • Visual Neuroscience
  • Human Perception

Background:

  • The accommodative response (AR) is the eye's ability to adjust focus.
  • Non-optical factors, such as environmental cues, may influence accommodation.
  • Understanding these influences is crucial for visual science.

Purpose of the Study:

  • To investigate the effect of knowledge of surround propinquity on open-loop accommodative response.
  • To determine if awareness of room dimensions impacts accommodation in darkness.

Main Methods:

  • Accommodation was measured in two differently sized laboratories (2.5m square and 6.75 x 2.75m).
  • Measurements were taken in total darkness using an infrared optometer.
  • Subjects' awareness of room dimensions was manipulated (informed vs. blindfolded).

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Main Results:

  • When unaware of room size, no significant difference in AR was observed.
  • When aware of room size, AR in darkness was significantly higher in the smaller laboratory.
  • This indicates proximally induced accommodation influenced the response.

Conclusions:

  • Prior knowledge of laboratory dimensions can induce accommodative responses.
  • Complex interactions between proximal, tonic, and non-optical stimuli affect accommodation.
  • Isolating individual non-optical accommodative components may be challenging.