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Related Experiment Videos

Accommodation responses and ageing.

G Heron1, W N Charman, L S Gray

  • 1Department of Vision Sciences, Glasgow Caledonian University, Scotland, United Kingdom. ghe@gcal.ac.uk

Investigative Ophthalmology & Visual Science
|November 5, 1999
PubMed
Summary
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Ageing significantly increases accommodative phase lag, especially at higher frequencies, while gain shows less change. Accommodation dynamics slow with age, impacting visual performance in older adults.

Area of Science:

  • Ophthalmology
  • Vision Science
  • Human Physiology

Background:

  • Accommodation is the eye's ability to change focus.
  • Age-related changes can affect visual function.
  • Understanding accommodation dynamics is crucial for visual health.

Purpose of the Study:

  • To investigate the impact of aging on the dynamics of accommodation.
  • To quantify age-related changes in accommodation gain and phase lag.

Main Methods:

  • Monocular accommodation responses measured using infrared optometry.
  • Sinusoidal and step vergence stimuli used across various frequencies (0.05-1.0 Hz).
  • Nineteen visually normal subjects aged 18-49 participated.

Main Results:

Related Experiment Videos

  • Accommodation gain decreased and phase lag increased with age, particularly at higher frequencies.
  • Reaction and response times showed no significant age-related changes.
  • Phase lag was longer than predicted in older observers, unlike younger ones.

Conclusions:

  • Ageing primarily affects accommodative phase lag, leading to longer lags than predicted by reaction times.
  • Age-related decline in accommodation dynamics is evident, with slowing observed in older individuals.
  • Despite reduced amplitude, middle-aged accommodation remains robust.