[Twins with congenital oculomotor apraxia (Cogan's syndrome)].

Cogan (1952) described a syndrome he called congenital ocular motor apraxia. The syndrome is characterized by 1. absence of voluntary gaze movements and fast phase of optokinetic response in horizontal direction, 2. typical jerky head movements in attempted gaze to either side, 3. nomral random movements and 4. normal vertical eye movements. A report is given on this disorder in the case of female twins.