Blepharospasm
 

Blepharospasm

Blepharospasm
Classification and external resources
Left orbicularis oculi, seen from behind.
ICD-10 G24.5
ICD-9 333.81
DiseasesDB 15748
eMedicine oph/202 
MeSH D001764

A blepharospasm (from Greek: blepharo, eyelid, and spasm, an uncontrolled muscle contraction), is any abnormal tic or twitch of the eyelid.

It normally refers to Benign Essential Blepharospasm, a focal dystonia - a neurological movement disorder involving involuntary and sustained muscle contractions of the muscles around the eyes. Benign means the condition is not life threatening. Essential indicates that the cause is unknown, but fatigue, stress, or an irritant are possible contributing factors. Symptoms sometimes last for a few days then disappear without treatment, but in most cases the twitching is chronic and persistent, causing lifelong challenges. The symptoms are often severe enough to result in functional blindness. The person's eyelids feel like they are clamping shut and will not open without great effort. Patients have normal eyes, but for periods of time are effectively blind due to their inability to open their eyelids.

Although strides have recently been made in early diagnosis, blepharospasm is often initially mis-diagnosed as allergies or "dry eye syndrome". It is a fairly rare disease, affecting only one in every 20,000 people in the United States.

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