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Does the lens diameter increase or decrease during accommodation? Human accommodation studies: a new technique using

R S Wilson1

  • 1Retinal Group, Ltd., Little Rock, AR 72205, USA.

Transactions of the American Ophthalmological Society
|January 1, 1997
PubMed
Summary
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This study introduces a new method to measure lens diameter changes during accommodation. Findings show the lens diameter decreases with accommodation, disproving older theories.

Area of Science:

  • Ophthalmology
  • Optics
  • Human Physiology

Background:

  • Accommodation is the eye's ability to change focus.
  • Understanding lens dynamics during accommodation is crucial for visual science.
  • Previous theories on lens diameter changes during accommodation require empirical validation.

Purpose of the Study:

  • To present an innovative technique for visualizing and quantifying lens diameter variations during accommodation.
  • To assess the accommodative lens response in a patient with ocular albinism.

Main Methods:

  • Utilized retro-illumination infrared video photography for dynamic lens observation.
  • Employed pixel unit measurements for precise lens diameter quantification.
  • Evaluated lens behavior under natural, pharmacologic non-accommodation (Tropicamide), and accommodation (Pilocarpine) states.

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Main Results:

  • Lens diameter measured 498-501 pu during natural accommodation.
  • Pharmacologic non-accommodation resulted in an average lens diameter of 524 pu (range 518-528 pu).
  • Pharmacologic accommodation showed an average lens diameter of 485 pu (range 479-491 pu).

Conclusions:

  • Lens diameter consistently decreases during accommodation and increases during non-accommodation.
  • Measurements were highly reliable, repeatable, and accurate.
  • The findings contradict theories suggesting lens diameter increases with accommodation, such as Tscherning's model.