These are the glasses that we used last year. They have indoor/outdoor lenses, so they make the arena light much less intense on your eyes, and helped with glare down on the field. Also, I work in landscaping, and I use them as sunglasses at the same time to keep my eyes more covered than regular sunglasses. They are very comfortable to wear, and to go along with what other have said, I often forget that I am wearing them!
http://www.safetyglassesusa.com/sg-14io.html
Unfortunately, in Atlanta, several of the head safety advisers (but not the one in our division) deemed them unsafe, as they thought they were mirrored, and they wouldn't let us in our own pit with them on. Mind you, we had won the safety award in Philadelphia, and no one had ever said anything there or at FLR.
As a solution, we found the same exact frames with clear lenses this year. Not as much fun, but at least we won't get yelled at again.
http://www.safetyglassesusa.com/sg-14c.html