What is Blepharospasm?

Blepharospasm is an abnormal, involuntary blinking or spasm of the eyelids.

Blepharospasm is associated with an abnormal function of the basal ganglion from an unknown cause. The basal ganglion is the part of the brain responsible for controlling the muscles. In rare cases, heredity may play a role in the development of blepharospasm.

Source

Facts About Blepharospasm
National Eye Institute