SMOOTH-PURSUIT DEVELOPMENT IN INFANTS

Purpose: We set out to assess the development of pursuit eye movements in normal infants in an objective, longitudinal fashion. We asked whe ther smooth pursuit (SP) was present under 2 months of age and how the saccade ratio changed with increasing infant age. Methods: Smooth pur suit was recorded longitudinally from 25 infants aged 1-7 months, usin g DC electro-oculography, in a clinically practical manner. Four unins tructed adults acted as controls. Results: Smooth pursuit was present under 2 months of age. The gain of SP increased with increasing infant age. However it had still not reached adult levels by 6 months of age . Latency decreased with increasing infant age. Monocular SP asymmetry was present in the younger infants. Conclusions: Smooth pursuit is pr esent under 2 months of age, but at 6 months SP has still not reached adult levels. The traditional model of SP development is questionable.