EE WAS REPAIRING A CAT 785 END DUMP FRAME WHEN AN ERRANT PIECE OF METAL FROM A CO-WORKER'S GRINDER LODGED IN HIS LEFT EYE. HE WAS STANDING WITH HIS BACK TO THE CO-WORKER'S GRINDING AND HE WAS ALSO WEARING CUTTING GLASSES. DISCOMFORT WAS MILD AT FIRST AND THEN BECAME WORSE. HE WAS SEEN AT THE E.R. WHERE PHYSICIAN REMOVED OBJECT AND PRESCRIBED EYE DROPS.