blepharospasm is the spasmodic closure of the eyes as a result of involuntary contraction of orbicularis oculi. Commonly blepharospasm occurs as a response to ocular pain.
repetitive blepharospasm is a form of focal dystonia
this condition may be exacerbated by stress
there may be other co-existing dystonias (e.g. oro-mandibular)
generally starts unilaterally and then bilateral blepharospasm develops
may be anteceded by particular conditions e.g. progressive supranuclear palsy, use of neuroleptic drugs, Parkinson's disease
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