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Changes in accommodation with age: static and dynamic.

F C Sun1, L Stark, A Nguyen

  • 1Neurology Unit, School of Optometry, University of California, Berkeley.

American Journal of Optometry and Physiological Optics
|June 1, 1988
PubMed
Summary
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Accommodative amplitude, the eye's focusing ability, declines significantly by age 40. This natural change, termed prepresbyopia, reflects development, not deterioration of the focusing mechanism.

Area of Science:

  • Ophthalmology
  • Physiological Optics

Background:

  • Accommodative amplitude, crucial for clear vision, naturally decreases with age.
  • Understanding the aging of the human eye's focusing ability is essential for visual health.

Purpose of the Study:

  • To investigate the age-related changes in accommodative amplitude and response.
  • To differentiate between age-related decline and potential deterioration of the accommodative mechanism.

Main Methods:

  • Analysis of accommodative amplitude measurements across different age groups.
  • Dynamical measurements to assess the speed and time constants of accommodative response.

Main Results:

  • Accommodative amplitude significantly decreases by age 40, with minimal residual accommodation after the mid-40s.

Related Experiment Videos

  • Accommodative response slows considerably in individuals over 30, indicated by increased time constants.
  • Accommodative amplitude is typically below 3 diopters by age 30.

    • Conclusions:

    • Prebyopia represents a developmental stage of the accommodative system, not a pathological deterioration.
    • The ciliary muscle's indirect action on the lens via the zonule of Zinn is central to accommodation.