In my opinion, it is bad to wear sunglasses all the time. In this way, it will just make your eyes be accustomed to the dark light. So when you take off your sunglasses, you will feel uncomfortable and your eyes will be hurt by the bright light. In serious situation, it will lead to many eye diseases. But there are actually many people who wear sunglasses all the time. They just want make themselves look cool and beautiful. It has become a trend. But I suggest you should not do it, for sake of your eyes' health. Just wear them when you go outside where there is bright sunshine.