Physically eyebrow is mainly function to prevent moisture, such as salty sweat and rain from flowing into the eye. Surprisingly, the shape of the eyebrow with a slant on the side and the direction in which eyebrow hairs are pointed, make the moisture flow sideways around the eyes, along the side of the head and along the nose. Another interesting info are, the eyebrows also shade the eyes from sunlight and also prevent debris such as dandruff and other small objects from falling into the eyes. :)
Reference:
http://en.wikipedia.org/wiki/Brow_ridge
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