We studied the eye movementa and visual perception in a man with extensive bilateral occipital lesions acquired at birth. He had 3/500 acuity, limited visual fields, and extrafoveal fixation attributable to an intact left superior visual cortex. Analysis of digitized electro-oculography and magnetic search coil data showed normal saccade dynamics. He could make voluntary saccadee. Smooth pursuit of suprathreehold targeta was mostly saccadic and did not improve with added nonvisual cues. Our resulta support the hypothesis that the vieual cortex is crucial to the development of eye movementa. The foveal representation in the occipital lobes, missing in thie subject, is needed for development of normal smooth pursuit.
ASJC Scopus subject areas
- Clinical Neurology