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First, the sensation of a sideways blink can be caused by dryness - the sensation of the drag of your eyelid over the surface of your eye. Spend much time on the computer? Take any perscription meds? Both can cause dry eyes. Allergies and contact lenses, too.
I simply don't see how you'd be able to involuntarily stretch the skin of your eyelid horizontally without tearing or bruising...
Originally posted by EnronOutrunHomerun
The only way I'd see that you'd be able to do this would be if you had a third eyelid, or a nictitating membrane...but I doubt that's the case...
Misfired nerve endings I would assume could account for part of the movement and sensation...
Like RedBalloon said, I'd highly suggest asking a doctor