Have you ever envied your friends who have five pair of sunglasses and who almost always have a pair pushed adorably up off of their foreheads? You can’t do that with glasses. Prescription sunglasses are too expensive to have a pair for every outfit.
And a lot of the “transition” lenses require direct UV rays to change color, which makes them next to useless in the car. With contacts, you can enjoy the convenience and fun of sunglasses.