I wear contacts, but I have reading glasses that I wear a lot, too. I carry them in my bag when I am riding alone, because if I had to change a flat, I would need them.
I have Tifosis with the interchangeable lenses, but I tried wearing the clear lenses the other morning when I rode at 5:30 AM and they just seem to distort my vision. I have ended up taking them off every time i have ridden in the dark.