Ocular dipping in Creutzfeldt-Jakob disease.

Ocular dipping refers to a slow downward deviation of both eyes followed by a quick return to the midposition after a brief delay. Two patients with rapid neurologic deterioration in Creutzfeldt-Jakob disease (CJD) displayed ocular dipping, which quickly evolved into sustained downgaze deviation. Ocular dipping may thus be a transitional sign in a vertical gaze disturbance.