I used to carry a clear pair of glasses for when it got dark, then I would just switch from the dark to the light. To be honest, it was getting to be a pain doing that switching. I wear glasses now, I never used to so I decided to go with the transition style glasses in prescription form. i went to Wal-Mart to buy them. Now I have to convenience of having a pair of glasses that let me see both day & night without the switching. Keep in mind that the transition type of glasses are not the best at blocking out the bright sun.