The muscle can close an eyelid in less than 100 milliseconds and reopen it in about 200 milliseconds. In rare cases, eyelid spasms may be debilitating and require treatment.

This eyelid muscle is the fastest working muscle in the human body, able to close an eyelid in less than 100 milliseconds and reopen it in about 200 milliseconds.

The striated muscle causes an instinctive, mild, and continuous contraction. Myokymia typically affects only one eyelid but is known to occur more often in the lower eyelid.

For patients who have one functioning eyelid, a sensor wire threaded over the normal eyelid could detect the natural blink impulse and fire the artificial muscle at the same time. Among patients ...