I wear glasses, and I was playing in the nets, with a couple of friends, about ten years ago. I got a bouncer, and went for the hook (I can't remember if I got a top edge or if it went straight into my face), but the ball broke my glasses, pushing one of the shards into my face, just above my right eye. I got seventeen stitches just above my eye and under my eyebrow (the stitches were very close together, in order to reduce the scarring, a cut of that size anywhere else would probably have needed 4 to 6 stitches). Luckily, thanks to the doctor's handiwork and copious amounts of vitamin E cream, there is hardly any noticeable scar, but I think I came pretty close to losing my eye that day. Needless to say, since that day I always wear a helmet when batting, in a match or at practice, even if I'm facing a four year old's off spinners.