Acquired pendular nystagmus with voluntary inhibition

This report documents a case of voluntary inhibition of acquired pendular n ystagmus after head trauma. A 30-year-old male developed oscillopsia and de creased visual acuity, as well as findings of acquired pendular nystagmus w ith voluntary inhibition after head trauma. The EOG finding was horizontal 18-20Hz bilateral symmetrical pendular nystagmus in all directions of gaze at near and distant fixation. Nystagmus did not change with 14 Prism Diopte r base-out prisms on both eyes, but it was possible to abolish it intention ally. Baclofen and Clonazepam had no effect in improving the patient's symp toms and EOG finding.