“The Eyes Have It”: Saccades and Fixation Defects in Movement Disorders

The examination of eye movements, and in particular the examination of saccades, is a critical part of the movement disorders examination. Saccadic slowing may be the first sign of an atypical parkinsonian state or of Huntington’s disease, and other eye movement disorders such as ocular flutter or opsoclonus may affect management acutely.