Crows feet are wrinkles marked in the corners of your eyes. The main cause is a combination of a loss of skin elasticity and collagen, and skin movement. Age and UV exposure are also contributing factors. 

Repeated muscle contractions from squinting, raising eyebrows or frowning cause your skin to fold and furrow, gradually leading to facial lines. 

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Non surgical anti ageing injectables like Botox is a common outpatient technique. It relaxes the muscles temporarily that surround around the eyes, smoothing the skin out.