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An eyelid twitch (blepharospasm) is a repetitive, involuntary spasm of the eyelid muscles. A twitch usually occurs in the upper lid, although it can occur in both the upper and lower lids. For most people, these spasms are very mild and feel like a gentle tug on the eyelid. Others may experience a spasm strong enough that it forces you to close your eyelid completely. Some people never have any noticeable signs.
Spasms typically occur every few seconds for a minute or two. Episodes of eyelid twitching are unpredictable-the twitch may occur off and on for several days. Then, you may not have any for weeks or even months. The twitches are painless and harmless, though they may be a nuisance. Most spasms will resolve on their own without the need for treatment.
In rare cases, eyelid spasms may be an early warning sign of a chronic movement disorder, especially if the spasms are accompanied by other facial twitches or uncontrollable movements.
Eyelid spasms may occur without any identifiable cause, and because they are rarely a sign of a serious problem, the cause is not often investigated. Nevertheless, eyelid twitches may be caused or made worse by:
If the spasms become chronic, you may have what's known as benign essential blepharospasm, the name for chronic and uncontrollable eyelid movement. This condition typically affects both eyes, and though the exact cause of the condition is unknown, the following may make spasms worse:
Benign essential blepharospasm is more common in women than men. It affects approximately 50,000 Americans and usually develops in middle to late adulthood. The condition will likely worsen over time, and may eventually cause blurry vision, increased sensitivity to light, and facial spasms.
Very rarely, eyelid spasms are a symptom of a more serious brain or nerve disorder. When the eyelid twitches are a result of these more serious conditions, they are almost always accompanied by other telltale symptoms. Brain and nerve disorders that may cause eyelid twitches include:
Undiagnosed corneal scratches can also cause chronic eyelid twitches. If you suspect you have an eye injury, see your optometrist immediately. Corneal scratches can cause permanent eye damage.