Eye twitching is a repetitive, uncontrollable blinking or spasm of the eyelid, usually the upper lid. Eye twitching (blepharospasm) usually affects the eye muscles of both eyes. If you have eye twitching, you may have an involuntary movement that recurs every several seconds for a minute or two.
Most people develop a minor eyelid twitch at some point in their lives. Although the cause is generally unknown, it may be associated with fatigue, stress or caffeine. This minor form of twitch is painless and harmless. It usually goes away on its own.