The prototype of abnormalities of the pursuit system of the eyes is the degradation of smooth tracking into a series of small saccades, traditionally called cogwheel eye movements, or, more precisely, saccadic pursuit.
Saccadic pursuit occurs bilaterally with - fatigue - inattention - decreased consciousness - diffuse brain disease - sedative or anti- convulsant drugs - if the fixation object is moved too quickly
It occurs unilaterally with deep occipito-parietal lobe lesions.
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