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blepharospasm

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bleph·a·ro·spasm (blf-r-spzm)
n.
Spasmodic winking caused by the involuntary contraction of an eyelid muscle.

blepharospasm
spasm of the orbicularis oculi muscle of the eyelid.

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14) Other eye-movement impairments commonly observed are apraxia of lid opening or closing (difficulty or slowness with voluntarily opening or closing the eyes), blepharospasm (involuntary closure of the eye caused by spasms of the orbicularis oculi), and decreased blinking frequency.
n Japan, the product is approved for the treatment of blepharospasm (uncontrollable blinking), hemifacial spasm and cervical dystonia (a movement disorder characterized by involuntary contractions of the neck muscles).
In 1989, the FDA approved the substance for use in patients with blepharospasm and hemifacial spasm.
 
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