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Abstract
Two patients with Parkinson disease (one anatomically confirmed) presented a disorder of eyelid opening known as ‘apraxia of eyelid opening’. The mechanism of this problem appeared to be related to the global slowing of the motor functions found in extrapyramidal syndromes. There is a persistent simultaneous activation of the orbicularis oculi and frontalis muscles. The syndrome is also present in Parkinson's disease as well as in progressive supranuclear palsy.