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Age-related changes in accommodative dynamics from preschool to adulthood.
Heather A Anderson1, Adrian Glasser, Ruth E Manny
1College of Optometry, University of Houston, Houston, Texas 77204-2020, USA. handerson@optometry.uh.edu
Investigative Ophthalmology & Visual Science
|August 18, 2009
Summary
Dynamic measures of accommodation and disaccommodation change with age. Accommodative responses, including latencies and microfluctuations, improve from childhood to adulthood, while disaccommodation speed remains constant.
Area of Science:
- Ophthalmology
- Vision Science
- Human Physiology
Background:
- Dynamic visual functions like accommodation are crucial for clear vision at varying distances.
- Understanding age-related changes in these dynamics is important for diagnosing and managing visual impairments.
Purpose of the Study:
- To investigate age-related variations in dynamic measures of accommodation and disaccommodation.
- To analyze changes in latencies, peak velocities, and microfluctuations across a wide age range.
Main Methods:
- Dynamic infrared photorefraction was used to record accommodative responses to a step stimulus.
- Subjects aged 3 to 38 years viewed alternating far and near stimuli at different demand levels.
- Latencies, peak velocities, and microfluctuations were calculated and compared across age groups.
Main Results:
- Accommodative and disaccommodative latencies decreased linearly with age.
- Accommodative microfluctuations were largest in children and smallest in adults.
- Accommodative peak velocities were fastest in younger individuals (first two decades) and slowed in older adults.
Conclusions:
- Significant age-related changes occur in the dynamics of accommodation and disaccommodation.
- These dynamic functions generally improve with age, with reduced latencies and fluctuations.
- Disaccommodative peak velocity did not show significant age-related differences.
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