What is blepharospasm?
Blepharospasm is a disorder consisting of involuntary tonic contraction of the orbicularis oculi muscle and the eyebrow muscle complex. This produces a complete and intense eyelid closure of varying duration.
It can have an ocular cause and, for example, be secondary to an injury, while being solved when the problem that causes it is cured. However, there is also a type of blepharospasm called “essential”, when we do not find a physical cause for it.
This pathology should not be confused with a twitch, another form of involuntary movement of the eyelids that is also due to a contraction of the orbicularis oculi muscle. However, while a twitch is a mild and temporary disorder, blepharospasm is chronic and can significantly impact quality of life.