I got Oakley glasses with progressive and polarized transition lenses. It was expensive but well worth it for me. I like starting my endurance weekend rides hours before dawn sometimes, and wearing my previous non-transition sun glasses was a bit dangerous. It was way too dark. With the transition lenses, I can go out an hour or two before dawn and continue, without changing glasses, as the bright Florida sun comes out. I also use a croakies strap to prevent the need for me to adjust my glasses every minute or two.