for the casual readers of this thread who only need reading glasses for seeing the speedo/computer, reading maps, and fixing flats and such, you might want to check out www.safetyglassesusa.com They have a great selection of bifocal reading/null sunglasses in lots of styles and colors.

I have 6 pair of dark glasses for day riding/driving, 2 pr of amber for overcast days, and 2 pr of clear for nights. I love them, and they were only $6 ea.( the amber were a bit more.) If you scratch or loose them you don't feel bad.