Question

Why do we have eyelashes???​

Answer 1

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We have eyelashes because these fine hairs are our eyes' first line of defense, shielding them from dust and dirt.

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Answer 2

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Eyelashes protect the eye from debris, dust and small particles and perform 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).