Lashes, also known as eyelashes, are the small wisps of hair that grow at the edges of the eyelids. They grow outwards in up to six layers on the edges of the upper and lower eyelids and serve three main functions: protecting the eye from debris, dust, and small particles; performing some of the same functions as whiskers do on a cat or a mouse in the sense that they are sensitive to being touched, thus providing a warning that an object (such as an insect) is near the eye (which then closes reflexively); and enhancing facial beauty. The eyelid margin from which lashes grow is among the most sensitive parts of the human body, with many nerve endings enveloping the lashes, giving it sensitivity to light touch, enabling it to trigger the blink reflex when touched. The number of individual lashes on the upper eyelid is typically 90 to 160, and on the lower eyelid 75 to 80. False eyelashes are a cosmetic enhancement attaching synthetic or natural fibers to the natural eyelashes to create a fuller, more dramatic look. Eyelash extensions are semipermanent fibers that are attached to your natural eyelashes in order to make your lash fringe look longer, fuller.