Computerized analysis of eye movements as a function of age

Area of Science:

• Ophthalmology
• Neuroscience
• Gerontology

Background:

• Eye movements, including saccadic (SEM) and smooth pursuit (SPEM), are crucial for visual perception and are known to change with age.
• Understanding age-related changes in eye movement parameters is essential for diagnosing neurological and ophthalmological conditions.

Purpose of the Study:

• To investigate age-related differences in vertical and horizontal saccadic eye movements and smooth pursuit eye movements in a cohort of normal subjects.
• To establish normative data for eye movement parameters that account for age-related variations.

Main Methods:

• Recorded vertical and horizontal saccadic eye movements (SEMv, SEMh) and smooth pursuit eye movements (SPEM) in 66 healthy subjects using a computerized system.
• Analyzed parameters such as peak velocity, delay, and accuracy for different eye movement types and age groups.

Main Results:

• Horizontal saccadic eye movements (SEMh) showed no significant differences between the right and left eye or gaze direction.
• Vertical saccadic eye movements (SEMv) exhibited significant differences in performance index (peak velocity) and delay between upgaze and downgaze.
• Both SEMh and SEMv showed significantly slowed performance index and delay in elderly subjects, without affecting accuracy.
• Smooth pursuit eye movements (SPEM) analysis revealed decreased velocity in elderly individuals, indicating diminished tracking ability due to aging.

Conclusions:

• Senescence significantly influences specific parameters of saccadic eye movements and smooth pursuit eye movements.
• Age-corrected normative data are crucial for accurate interpretation of eye movement recordings in clinical and research settings.
• These findings highlight the impact of the aging process on visual-motor functions.