um, I think you'll want to be "eye-glasses" free when you're fighting in the ring, my friend. I don't even think they allow eye wear. and yes, best not to wear contacts either.

I would recommend getting prescription sport goggles. I use them for sparring in karate.

I can see without them, not well, but enough to see when somebody's going to kick or punch at me, figures up close are just a bit blurry. I don't want contacts because my bud had his break and one went to the back of his head =/