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Saccadic lens instability increases with accommodative stimulus in presbyopes.

Lin He1, William J Donnelly, Scott B Stevenson

  • 1College of Optometry, University of Houston, 4901 Calhoun Road, Houston, TX 77204, USA. lhe.2011@alumni.opt.uh.edu

Journal of Vision
|May 15, 2010
PubMed
Summary
This summary is machine-generated.

Saccadic lens wobble increases with accommodative effort in presbyopes, suggesting preserved ciliary muscle function. This study used an eye tracker to measure lens movement during accommodation changes.

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Biomedical Engineering

Background:

  • Presbyopia, the age-related loss of accommodation, affects ciliary muscle function.
  • Measuring ciliary muscle function directly is challenging.
  • Lens wobble after saccades can serve as an indirect indicator of ciliary muscle activity.

Purpose of the Study:

  • To investigate the relationship between accommodative effort and saccadic lens wobble in presbyopes.
  • To assess ciliary muscle function indirectly through lens movement.
  • To explore potential causes of measured lens wobble artifacts.

Main Methods:

  • Utilized an SRI dual Purkinje image (dPi) eye tracker to record lens wobble.
  • Ten presbyopic subjects performed saccades at varying accommodative demands (0.5 to 8-D).
  • Employed a ray tracing eye model to simulate Purkinje image shifts.

Main Results:

  • A significant positive correlation was found between lens wobble amplitude and accommodative demand.
  • Simulations suggested lens tilts (2-4 degrees) or translations (0.1-0.2 mm) could explain observed wobble.
  • Saccadic lens wobble increased with accommodative effort in presbyopic individuals.

Conclusions:

  • Saccadic lens wobble artifacts increase with accommodative effort in presbyopes.
  • Findings indicate preserved ciliary muscle function and greater zonular relaxation during accommodation.
  • Individual variations in wobble may be due to differences in accommodative effort, ciliary muscle function, or ocular anatomy.