I don't wear sunglasses while riding to be stylish-- I have to wear glasses all the time, and I generally prefer not having things fly into my eyeballs, so I wear wraparound shades on the bike. As a full-time glasses wearer, I have absolutely zero blind-spot issues with my prescription sunglasses for cycling. Any frame with a wraparound lens shape will most likely have the point where the stem meets the frame out of your peripheral vision anyway.