Really appreciate all the good responses to my original post. I'm looking at the initial purchase of normal glasses and sunglasses as "data collection". I'll have to figure out what works best for riding, computer, driving. FWIW, I wear safety glasses with 2.0 diopter inset for riding and they generally work well, but my uncorrected vision is somewhere between 20/40 and 20/80 so reading certain types of signs can be difficult and of course the stoker can't see a darn thing form the back of the bus. I'll try the prescription sunglasses for riding, but I may need something more specific to cycling.