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Effect of aging on horizontal smooth pursuit.
Investigative Ophthalmology & Visual Science
|May 1, 1978
Summary
Elderly individuals exhibit slower smooth pursuit eye movements and delayed initiation compared to younger adults. This age-related decline in visual tracking highlights the importance of considering patient age in diagnosing pursuit abnormalities.
Area of Science:
- Ophthalmology
- Neuroscience
- Gerontology
Background:
- Smooth pursuit eye movements are crucial for maintaining visual fixation on moving objects.
- Age-related changes in motor systems can affect visual tracking abilities.
Purpose of the Study:
- To quantitatively assess age-related differences in horizontal smooth pursuit eye movements.
- To investigate the impact of age on the velocity and latency of smooth pursuit.
Main Methods:
- Quantitative infrared oculography was used to record horizontal eye movements.
- Young and elderly normal subjects tracked triangular waveform targets at various velocities and amplitudes.
Main Results:
- Elderly subjects showed significantly lower smooth pursuit velocities compared to young subjects.
- Older individuals exhibited significantly prolonged latencies in initiating smooth eye movements.
- These deficits were observed particularly at target velocities of 10 degrees/sec and higher.
Conclusions:
- Smooth pursuit is an age-dependent motor system.
- Reduced smooth pursuit velocity and increased latency in the elderly are significant age-related findings.
- Diagnosis of abnormal pursuit must account for the patient's age.