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Blepharospasm (BB) in an involuntary movement disorder characterized by stereotyped, bilateral, and synchronous spasms of the orbicularis oculi (OO) muscles. Spasms may be either brief or sustained and give rise either to narrowing or spasmodic closure of eyelids thus leading to functional blindness [1]. Dystonia of the lower face is frequently associated with BB [2].
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Sergio et al. (2022) studied this question.
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