INJURED WAS USING A HAND GRINDER TO GRIND METAL OFF OF A SCALER MACHINE. A METAL SLIVER BECAME IMBEDDED IN HIS EYE WHEN IT FLEW BACK TOWARD HIM. HE WAS WEARING SAFETY GLASSES AT THE TIME AND A FACE SHIELD. HE FLIPPED HIS SHIELD TO EXAMINE HIS WORK, BUT DID NOT PUT IT BACK DOWN WHEN HE STARTED GRINDING AGAIN.