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Related Experiment Videos

A model for crystalline lens accommodation.

Chang-Hai M Chien1, Tseng Huang, Ronald A Schachar

  • 1Department of Civil and Environmental Engineering, University of Texas at Arlington, Arlington, Tex., USA.

Comprehensive Therapy
|November 11, 2003
PubMed
Summary
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Applying equatorial tension to the crystalline lens causes it to thicken and steepen. This increases the eye's optical power, supporting Schachar's theory of accommodation.

Area of Science:

  • Ophthalmology
  • Optics
  • Biomechanics

Background:

  • Understanding the crystalline lens's response to mechanical stress is crucial for explaining visual accommodation.
  • Existing theories on accommodation require further biomechanical validation.

Purpose of the Study:

  • To investigate the biomechanical effects of equatorial tension on the crystalline lens.
  • To determine if these effects align with Schachar's theory of accommodation.

Main Methods:

  • A slight equatorial pull was applied to the crystalline lens.
  • Changes in lens thickness, surface curvature, and optical power were measured.

Main Results:

  • The crystalline lens center thickened under equatorial pull.

Related Experiment Videos

  • The central surfaces of the lens exhibited increased steepness.
  • A significant increase in the optical power of the lens was observed.

    • Conclusions:

    • The observed changes in the crystalline lens are consistent with Schachar's theory of accommodation.
    • Equatorial tension is a plausible mechanism driving accommodative changes in the human eye.