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Static aspects of accommodation: age and presbyopia
1SUNY/State College of Optometry, Department of Vision Sciences, New York 10010, USA.
Vision Research
|September 25, 1998
Summary
As people age, tonic accommodation and accommodative amplitude decrease, while subjective depth-of-focus increases, impacting vision and presbyopia development.
Area of Science:
- Ophthalmology
- Vision Science
- Physiological Optics
Background:
- Age-related decline in accommodative amplitude (presbyopia) is known.
- Limited understanding of other static accommodation components with aging.
Purpose of the Study:
- To comprehensively assess age-related changes in static accommodation.
- Investigate tonic accommodation, depth-of-focus, and controller gain.
Main Methods:
- Objective assessment using infrared (IR) optometry.
- Psychophysical determination of depth-of-focus and accommodative amplitude.
- Study included 30 human subjects aged 21-50 years.
Main Results:
- Tonic accommodation and accommodative amplitude decreased with age.
- Subjective depth-of-focus increased with age.
- Objective depth-of-focus, slope, and controller gain remained unchanged.
Conclusions:
- Age-related decreases in accommodation attributed to biomechanical factors.
- Increased subjective depth-of-focus linked to presbyopia onset and defocus tolerance.
- Findings support the Hess-Gullstrand theory of accommodation and presbyopia.