Why does My Eyelid Twitch?

An eyelid twitch is an annoyance when it happens and sometimes we wonder why it happens. The culprit is simply an involuntary muscle contraction that repeats over and over. You can find more information here: http://www.uic.edu/com/eye/LearningAboutVision/EyeFacts/FYIAboutEyes.shtml
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