A few suggestions: Many possibilities. Assuming no changes in vision and not having any additional information, here are some things that it could be (although I can't make a complete list without more info). asthenopia, muscle spasm of orbicularis muscle in eyelid, thyroid eye disease (Graves disease) causing lid lag, myasthenia gravis. If you have any other symptoms, should have it evaluated by ophthalmologist.
Answered 5/17/2014
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