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Related Experiment Videos

Accommodative changes in lens diameter in rhesus monkeys.

Adrian Glasser1, Mark Wendt, Lisa Ostrin

  • 1College of Optometry, University of Houston, Houston, Texas 77204-2020, USA. aglasser@uh.edu

Investigative Ophthalmology & Visual Science
|December 31, 2005
PubMed
Summary
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The rhesus monkey lens diameter decreases during accommodation, supporting the Helmholtz theory. This study measured refractive changes and lens diameter to understand primate accommodation mechanisms.

Area of Science:

  • Ophthalmology
  • Primate Vision Research
  • Accommodation Mechanisms

Background:

  • The precise mechanism of lens accommodation in primates remains a subject of scientific debate.
  • Key questions persist regarding whether the lens equatorial diameter increases or decreases during accommodation.

Purpose of the Study:

  • To investigate the relationship between changes in lens diameter and refractive state during accommodation in rhesus monkeys.
  • To provide empirical data to resolve the debate on primate accommodative mechanisms.

Main Methods:

  • Utilized photorefraction to measure accommodative changes in rhesus monkeys.
  • Employed goniovideography to dynamically measure lens equatorial diameter changes.
  • Stimulated accommodation via the Edinger-Westphal nucleus in iridectomized monkey eyes.

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Main Results:

  • A consistent, linear decrease in lens equatorial diameter was observed during accommodation.
  • The lens diameter decreased by approximately 0.055 mm per diopter (D) of accommodation.
  • This resulted in a total lens diameter reduction of about 7% for 12 D of accommodation.

Conclusions:

  • The rhesus monkey lens diameter systematically decreases with refractive change during accommodation.
  • Findings align with the established Helmholtz accommodative mechanism.
  • Results contrast with the alternative accommodative mechanism proposed by Tscherning.