eye disorders
Blepharospasm
Introduction
Blepharospasm is spasm of muscles around the eye causing involuntary blinking and eye closing. The cause of blepharospasm is most often unknown. It affects women more than men and tends to occur in families. Rarely, blepharospasm may be secondary to eye disorders, including those that cause ocular irritation (eg, Trichiasis , an inward growing eye lash), corneal foreign body, Symptoms are involuntary blinking and closing of the eyes; in severe cases, people cannot open their eyes. Spasms may be made worse by fatigue, bright light, and anxiety. Treatment of blepharospasm involves injecting botulinum toxin type A into the eyelid muscles; treatment must be repeated in most instances. Anxiolytics may help. Surgery to cut the periorbital muscles is also effective but, because of potential complications, is considered only if botulinum toxin is ineffective. Sunglasses help decrease the light sensitivity that may cause or accompany blepharospasm. Temporary relief can also be obtained by alleviating maneuvers such as touching the face, covering the eyes, singing, or yawning ( General reference ). 