Conjugate eye movements: comparison of cerebral palsied and normal adults.

Stimulus-driven binocular pursuit and saccadic movements (+/- 4 degrees, +/- 8 degrees; 0.3 Hz, 0.5 Hz) were measured in 6 cerebral palsied adults and 5 normal adults using a head-free corneal reflection technique. Correlation coefficients for binocular position and r2 were calculated; the latter were pooled for each group into 6 categories of eye movement: horizontal and vertical triangle and sine wave pursuit and saccades. The differences between the group means r2 in each category were tested by the Mann-Whitney U. The eye positions were statistically less conjugate for the cerebral palsy group in all categories. The differences and similarities between the groups are discussed with regard to neural and muscular control, visuomotor development, and organization of the visuomotor system.