Progressive Supranuclear Palsy
A 59-year old man clinically diagnosed with progressive supranuclear palsy. The oculomotor examination shows preserved horizontal pursuit and vertical gaze pursuit. Convergence is absent, and he shows minimal square wave jerks when fixing his gaze on the camera. Optokinetic nystagmus is horizontally preserved and vertical optokinetic nystagmus is reduced, with observation of square wave jerks. He also shows poor blink rate.
Irene Litvan, MD
CONTINUUM: Lifelong Learning in Neurology. 19(5, Movement Disorders):1189-1212, October 2013