Sunglasses. What reason do people wear sunglasses for when the sun is not shining?

Are they trying to hide their real feelings, are they afraid of eye-to-eye contact?
Update: Some answers, so far, mention medical reasons etc. I was already aware of that. I agree with those who say that if there is no valid excuse, why wear them? People who try to `look cool` have my full disgust at their lack of confidence, and their attempt to try to be something which they are not. They are kidding... show more Some answers, so far, mention medical reasons etc. I was already aware of that. I agree with those who say that if there is no valid excuse, why wear them? People who try to `look cool` have my full disgust at their lack of confidence, and their attempt to try to be something which they are not.
They are kidding only themselves.
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