Clinical and EMG Characteristics of Pretarsal Motor Persistence

Pretarsal motor persistence (PMP), a subtype of apraxia of the eyelid opening, is characterized by the inability to open the eyelids at will due to persistent activity of orbicularis oculi muscles following voluntary closure. Here, we describe clinical characteristic and the synchronous EMG recording from the levator palpebrae and orbicularis oculi muscles of PMP in patient with essential blepharospasm, idiopathic Parkinson's disease, and progressive supranuclear palsy.