In addition to wearing safety glasses, a safety shield, and ear plugs, You also might wanna wear a cap to cover your head.
This past July I was cutting with a grinder, I was wearing everything but the cap, and some of the ground metal ended up in my hair, after I was done cutting, I removed the glasses and shield, only to have the pieces of metal from my hair fall into my eyes. One piece got lodged real bad and started to rust over night. I had to go to the Opthamologist to get it removed. This was the second time something like this happened.
The first time I was cutting metal with a sawzall while wearing safety glasses, I guess the wind blew the small metal particles under the glasses and a piece got lodged in my eye.