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A physical model demonstrating Schachar's hypothesis of accommodation

R A Schachar1, D P Cudmore, R Torti

  • 1Department of Physics and Civil Engineering, University of Texas at Arlington.

Annals of Ophthalmology
|January 1, 1994
PubMed
Summary

Schachar's hypothesis on accommodation suggests increased zonular tension steepens the human lens. This study demonstrated that stretching a gelatin lens model and human lens samples increased central curvature, supporting the hypothesis.

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Area of Science:

  • Ophthalmology
  • Biomechanics
  • Physiology

Background:

  • Schachar's hypothesis proposes that increased zonular tension during accommodation leads to changes in lenticular curvature.
  • Understanding the biomechanical forces governing the human lens is crucial for explaining the accommodation mechanism.

Purpose of the Study:

  • To investigate whether increased zonular tension can cause central curvature steepening of the lens.
  • To provide empirical evidence supporting or refuting Schachar's hypothesis of accommodation.

Main Methods:

  • Digitizing profile photographs of unstretched and equatorially stretched gelatin balloons and human lenses.
  • Measuring and comparing the radii of curvature of the lens models and human lens samples in different states.

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Main Results:

  • Equatorial stretching of both the gelatin balloon and the human lens resulted in a significant steepening of the central curvature.
  • The observed changes in curvature were consistent with the forces predicted by Schachar's hypothesis.

Conclusions:

  • The study supports Schachar's hypothesis by demonstrating that increased zonular tension can indeed lead to central lens curvature steepening.
  • These findings contribute to the understanding of the biomechanical basis of visual accommodation.