Blepharospasm is a cranial nerve dysfunction in which involuntary and 
uncontrollable forcible lid closure occurs. Surgical treatment is far from 
ideal, but the condition can be improved by sectioning the branches of the 
facial nerve plexus which supply the orbicularis oculi, the frontalis and 
corrugator muscles, and the midfacial muscles. Not all patients with 
blepharospasm should be operated upon, since they may expect too much or may 
enjoy the attention their invalidism has given them. Ectropion of one or both 
lower lids may occur, and the most severe of all complications is recurrence. 
This may happen despite a careful microscopic search for the nerve fibers and 
their division and avulsion. Blepharospasm patients often require considerable 
psychological support.