Eyelash flutters, also known as eyelash flicker or eyelash flicker reflex, is a phenomenon in which the eyelashes of a person move rapidly and involuntarily. This movement is caused by a sudden change in light intensity or a sudden movement of the eye. The term 'eyelash flutters' is derived from the fact that the eyelashes move rapidly and flutter like a butterfly's wings. Blinks, which is a 6-letter word, is another term for this phenomenon.