The eyebrow is an area of thick, delicate hairs above the eye that follows the shape of the lower margin of the brow ridges. Their main function is to protect the eye, but they are also important to human communication and facial expression.[1] It is not uncommon for people to modify their eyebrows by means of hair addition or removal, make up, or piercings.
The main function of the eyebrow is to prevent moisture, mostly salty sweat and rain, from flowing into the eye. The typical curved shape of the eyebrow (with a slant on the side) and the direction in which eyebrow hairs are pointed, make sure that moisture has a tendency to flow sideways around the eyes, along the side of the head and along the nose. The slightly protruding brow ridges of modern humans could also still play a supporting role in this process.[citation needed] Together with the brow ridges, the eyebrows also shade the eyes from sunlight. Eyebrows also prevent debris such as dandruff and other small objects from falling into the eyes, as well as providing a more sensitive sense for detecting objects being near the eye, like small insects.
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