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Related Experiment Videos

[Aging changes in accommodation--comparison of subjective method with objective method]

K Toshida1, F Okuyama, T Tokoro

  • 1Department of Ophthalmology, Tokyo Medical and Dental University School of Medicine, Bunkyo-ku, Japan.

Nippon Ganka Gakkai Zasshi
|May 1, 1993
PubMed
Summary
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The human eye's ability to focus, known as accommodation, declines with age. Larger targets improved subjective accommodation measurements, but objective measurements showed a consistent age-related decrease.

Area of Science:

  • Ophthalmology
  • Vision Science
  • Human Physiology

Background:

  • Accommodation is the eye's ability to change focus from distant to near objects.
  • Age-related changes in accommodation can impact visual function and quality of life.
  • Understanding these changes is crucial for developing effective interventions.

Purpose of the Study:

  • To investigate age-related changes in the amplitude of accommodation in the human eye.
  • To compare subjective and objective measurements of accommodation.
  • To examine the influence of target size on accommodative responses.

Main Methods:

  • Subjective amplitude of accommodation measured using a Visual Display Terminals Accommodometer.
  • Objective amplitude of accommodation measured using an Auto Refkeratometer.

Related Experiment Videos

  • Measurements conducted on 97 subjects aged 15 to 58 years, with varying target sizes used for initial analysis.

    • Main Results:

    • Both subjective and objective amplitudes of accommodation decreased with increasing age.
    • Larger target sizes showed a tendency to increase subjective amplitude of accommodation.
    • The difference between subjective and objective accommodation amplitudes varied with age, being greater in younger individuals.

    Conclusions:

    • Accommodation amplitude significantly declines with age in normal human eyes.
    • Objective measures of accommodation are essential for accurate assessment, as subjective measures can be influenced by factors like target size.
    • Age-related presbyopia is characterized by a progressive loss of accommodative ability.