Safety goggles, people. Use them. I'm partly blind in one eye, not because of an accident but due to a congenital defect - and this has made me very protective of my one good eye, because basically I only get one mistake in that department.
Several years ago now, when I still worked in construction, I was working on a deck, and was using a miter saw to chop some of the boards to length.
Anyway, I stopped to take a short break, pushed my safety goggles up to wipe my face and was getting a drink of gatorade. Someone else, about a dozen feet away, was nailing up some railing. The wood was a bit hard and bouncy. He hit the nail a bit off perfect and it rebounded backwards, flew the four yards through the air, and struck me directly in the eye.
I had to have surgery on it 4 times, was out of work for nearly half a year, and I still can see nothing more than a large blur on that side.
SAFETY GUYS. ITS IMPORTANT.