Ocular oscillations.

A variety of abnormal ocular oscillations consequent to brain stem and cerebellar dysfunction are described. The brain stem eye signs include: see-saw nystagmus, convergence-retraction nystagmus, down-beat nystagmus, ocular myoclonus, ocular bobbing, and superior oblique myokymia. The "cerebellar system" eye signs discussed are five varieties of nystagmus, square wave and macro square wave jerks, macro saccadic oscillations, ocular dysmetria and flutter, and opsoclonus.