Blepharospasm and Hemifacial Spasm are both conditions causing uncontrolled spasm of the eyelid, brow, and cheek. Blepharospasm is a rare neurologic disorder affecting both eyes. Patients have frequently forced blinking and eye irritation which can be worsened with stimuli such as bright lights, fatigue, stress, wind, and air pollution. The average age of onset is 56 years. Blepharospasm is more common in women. The cause of blepharospasm is unknown.

Hemifacial spasm is characterized by contractions on one side of the face. Hemifacial spasm may follow an episode of Bells Palsy. It may be caused by pressure on or irritation of the facial nerve.

Treatment for both conditions is most commonly botulinum toxin injection. The medication is injected in small quantities to the muscles causing the abnormal contractions. The toxin weakens the muscles for approximately three months at which time the injections are repeated.