I play squash 2-3 times/week. Some weeks ago I received a ball in the eye with some damage (and even with that I consider I was lucky), and now have to wear serious protection for my eyes.
I would recommend the same for you, but if you are considering these glasses then you go ok.
These glasses fixation is the best I have ever tried. Thanks to the rubber grip arms they never move. Not fall, they neither move out of place during game. Never ever had to use the neoprene head strap.
The lens feels bulletproof. You are sure playing with them.
Also, from all the glasses I have tried, these are the lightest ones, which helps to keep in place and steady confortable. And these are really cool, you don't feel very ridiculous with them. Obviously you look better without them, but from all the glasses I have seen, these are the coolest (crystal is totally transparent, not black nor shaded as in some pictures).
Well so, where is the problem? As other reviewer mentioned, vision is a bit altered. I would not say as him that you feel dizzy and all is zoomed, but I would say that, in some way, what you see is altered, somehow. Probably because the contoured lens shape, don't know.
The other problem is the eternal fog problem. Honestly I tend to swear and I run much in the court, and sometimes I have suffered some little fogging (it's mandatory with glasses to use a headband. Check the Halo ones :) ). So I am not happy at all in this thing.
After these I was not happy at all. I could play with them but I was looking for more because of the a bit strange vision and not to clear vision due to small fogging sometimes (probably also some sweating falling to the lens).
Then I bought the Wilson NVues. Had to do from USA because in Europe I could not find them. Those are really awesome. Total perfect vision, no fogging and nearly confortable and light as the Dunlops. A bit heavier and not so confortable to wear, but really good in that anyway. I prefer the Wilsons for sure.