Most eye twitches are harmless, involuntary spasms of the tiny muscles surrounding the eye. Some causes are fatigue, squinting a lot, consuming too much caffeine, or working in a less than ideal visual environment- for example staring at a computer screens for long periods of time. Just like a muscle spasm at any other part of the body, an eye twitch can mean you've taxed your muscles and need to relax them. Persistent, more violent eye twitches could be a symptom of other physical or psychological ailments, such as undue stress, neurological damage, or even epilepsy. This is referred to as blepharospasm. You can read more about blepharospasm here
http://www.steen-hall.com/bspasm.html
If this has been going on for a while, then I would see your doctor for an evaluation to determine the exact cause.
Source(s):
I am a nurse for over 23 years

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