CONVERGENCE PARALYSIS AFTER LESIONS OF THE CEREBELLAR PEDUNCLES

We studied vergence eye movements in a patient with limited hemorrhage affecting the right cerebellar peduncles and the hemisphere. The pati ent showed exotropia of 30 prism dptr during near vision. Some vergenc e paradigms were investigated in this patient. We studied fusional ver gence evoked by placing a wedge prism before one eye. Accommodative ve rgence was studied by blur stimulus using a servocontrolled optometer. Lens accommodation was also recorded during blur stimulus. Although a ccommodative responses were normal, accommodative vergence was almost absent as well as fusional convergence in this patient. It has previou sly been reported that the cerebellum has a role in the control of ver gence in the monkey. Our data suggest that the human cerebellum also r elates to the control of vergence.