For a little perspective: once the vast majority of the roads raced on were paced, a lot of racing cyclists didn't wear glasses at all until rather recently. Look at the pre-helmet photos. After goggles were no longer needed for dirt roads, racers rode with no eye covering.

Yes, poor on the UV. Tiring, But the bike can be ridden just fine. I did all my racing with wire rim glass glasses, ala Laurent Fignon though I was before his time. (Glass is a pretty good UV block, unlike the untreated plastic lenses.) And now I wear prescription glasses and sunglasses, but not cycling specific. In fact, I wear glasses that have nearly rectangular and high outside corners so my helmet mirror is in a very good place, out of the way but completely in focus. (And I wear my helmet straps outside my helmet. Those glasses cost me enough that I don't want them being tossed off every time my helmet gets jarred. (Or I forget and just pull my helmet off.)

Ben