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Related Experiment Videos

Experimental support for Schachar's hypothesis of accommodation

R A Schachar1, D P Cudmore, T D Black

  • 1Department of Physics, University of Texas at Arlington.

Annals of Ophthalmology
|November 1, 1993
PubMed
Summary
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Stretching bovine eyes increased lens diameter and optical power, contradicting Helmholtz

Area of Science:

  • Ophthalmology
  • Optics
  • Biomechanics

Background:

  • The mechanism of eye accommodation, or focusing, is debated.
  • Helmholtz's theory suggests lens thinning during accommodation.
  • Schachar's theory proposes increased zonular tension.

Purpose of the Study:

  • To investigate the physical relationship between equatorial lens diameter and optical power.
  • To test competing hypotheses of eye accommodation.

Main Methods:

  • Radial stretching of bovine sclera-ciliary bodies.
  • Measurement of effective optical power.
  • Measurement of lenticular equatorial diameter.

Main Results:

  • Increased equatorial lens diameter led to increased optical power.

Related Experiment Videos

  • This finding challenges the traditional Helmholtz accommodation theory.
  • Results align with Schachar's hypothesis.

    • Conclusions:

    • Lens equatorial diameter changes significantly impact optical power.
    • The study provides evidence supporting increased zonular tension during accommodation.
    • Findings necessitate a re-evaluation of current accommodation models.