I always wear sunglasses when it is sunny outside. I keep them in my car because my pocketbook is not big enough to add one more thing. There are medical reasons to consider wearing sunglasses as well. I work for an ophthalmologist and there is reason to believe that ultraviolet light can contribute to the forming of cataracts. Their progression can be slowed by wearing glasses that block UV light. Of course if we all live long enough we will develop cataracts but why hurry up the process.