While using my string trimmer, a piece of debris flew up and hit my eye, dead center of the cornea. It blurred my vision slightly, so I went to the doc two days later, and was told I lacerated my cornea. To make a long story short, I now have scar tissue on this cornea, and my 20/20 vision is gone. I have been a full time firefighter for 13 years, and lco for four years. Never once did I think I would injure my eyes. Well, it happened to me. please wear those safety glasses.