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Surround Propinquity and Tonic Accommodation.

Tammy Nguyen1, Lawrence R Stark

  • 1*MS, OD †BAppSc(Optom), PhD, FAAO Southern California College of Optometry, Marshall B. Ketchum University, Fullerton, California (all authors).

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Summary
This summary is machine-generated.

The propinquity response, where vision adjusts to perceived surroundings in darkness, is a small but significant factor in dark focus measurements. This effect is unlikely to impact large sample studies but can be pronounced in some individuals.

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Area of Science:

  • Optometry
  • Vision Science
  • Human Factors

Background:

  • Dark focus, the eye's refractive state in the absence of a visual stimulus, has been linked to a propinquity response.
  • The propinquity response involves accommodation to perceived environmental distances even in complete darkness, suggesting persistent spatial representations.

Purpose of the Study:

  • To quantify the significance and magnitude of the propinquity response in young adults.
  • To investigate if initial dark focus predicts the propinquity response in an unfamiliar dark environment.

Main Methods:

  • Dark focus was measured using a dynamic infrared optometer in 30 young adults, with 26 naive to the testing room.
  • Measurements were taken at varying dioptric wall distances (0.25-4D) after viewing the lighted room.
  • The slope of dark focus plotted against dioptric wall distance served as the propinquity response measure.

Main Results:

  • The mean initial dark focus for naive subjects was 1.05D (SD 1.04D).
  • A small but statistically significant propinquity response was observed (mean slope +0.097, P = .0002).
  • No significant correlation was found between initial dark focus and the propinquity response (r = +0.246, P = .226).

Conclusions:

  • The propinquity response is a minor, statistically significant factor influencing dark focus measurements.
  • While generally not contaminating large-sample studies, some individuals display substantial propinquity responses.