Involuntary increased blinking that progresses to spasms in both eyes. The exact cause is unknown, but doctors believe it to be a central nervous system disorder. It can produce a functional blindness since the patient can't open his or her eyes long enough to function visually.
Condition characterized by uncontrollable, forcible closure of the eyelids caused by a progressive dysfunction of the nerve that controls muscles around the eye. Less serious form may cause eyelid twitches or tics.
A blepharospasm (from blepharo (eyelid) and spasm (uncontrolled muscle contraction)) is any abnormal tic or twitch of the eyelid. However, it is normally distinguished from less serious disorders and refers to Benign Essential Blepharospasm, a focal dystonia (a neurological movement disorder involving involuntary and sustained muscle contractions) of the muscles around the eyes. The cause can be caffeine, fatigue, or a possible irritant.