I have the Optilabs Rascal in prescription transitions. They are great for regular riding, and the customer service was really good too (they talked me out of getting the more expensive brown transition lenses), but the top of the frame is in the way a bit when I get really low on the aero bars. I don't really fancy contacts unless there's no alternative (used to have them, but had issues with my eyes drying out).
I need to visit the opticians anyway, so I'll see what they say and return to this thread...