This troper justifies this trope; one upside to wearing prescription glasses is that clip-on sunglasses stick out far enough for you to see behind you. It works even better at night.

Tropers/BTIsaac had a friend in High School, who once tried to look cool by putting on shades. He took them off after walking into a wall in a dark corridor.

Moosehp uses polarized prescription round glasses at night when on a bike, they have very little impact on the contrast but do reduce greatly the chance of being blinded by car lights.

This troper has done this after being out all day and not going home before going clubbing. In fact, this troper lost his favourite pair of sunglasses this way.

When going out at night, this troper will do this. The mirrored shades are the main pick, but I also have worn the red ones as well.