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Related Experiment Videos

Presbyopia, accommodation, and the mature catenary.

D J Coleman1, S K Fish

  • 1Department of Ophthalmology, The New York Presbyterian Hospital-Weill Medical College of Cornell University, New York, New York 10021, USA.

Ophthalmology
|September 6, 2001
PubMed
Summary

Aging causes lens changes and accommodative loss, explained by the catenary theory. A mechanical model simulating the human lens supports this, offering insights into presbyopia and intraocular lens design.

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Area of Science:

  • Ophthalmology
  • Biomechanical Engineering
  • Physiological Optics

Background:

  • Age-related changes in the human lens lead to presbyopia, a decline in the ability to focus on near objects.
  • The exact mechanisms underlying age-related accommodative loss remain debated.
  • Existing theories often struggle to fully explain observed changes in lens optics and function.

Purpose of the Study:

  • To propose a plausible explanation for age-related changes in the human lens.
  • To investigate the catenary theory of lens change as a model for accommodation.
  • To reduce controversy surrounding the mechanisms of accommodation with aging.

Main Methods:

  • A mechanical model simulating the human lens was constructed using fluid-filled latex balloons and a plastic wrap hammock.

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  • The model represented the lens in both accommodated and unaccommodated states.
  • Increasing fluid volumes simulated age-related increases in lens volume, and changes in curvature were measured and compared with mathematical modeling.

    • Main Results:

    • Measurements demonstrated that accommodative loss, mass displacement, and reproducible lens surfaces align with the catenary theory.
    • The model supports the concept of increasing lens volume with age contributing to accommodative changes.
    • Zonule support was also found to be consistent with the catenary model.

    Conclusions:

    • The catenary theory of accommodation offers a framework for understanding age-related human lens changes.
    • The model can predict variable outcomes of surgical procedures for presbyopia.
    • Findings can inform the design of intraocular lenses for improved vision correction.