EMPLOYEE WAS CLEANING THE GEAR BOX AUTO CRANE WHICH IS A PART OF MECHANIC TRUCK. THEY WERE USING COMPRESSED AIR WHEN A PIECE OF SMALL METAL CAME IN BEHIND HIS SAFETY GLASSES AND EMBEDDED IN HI S EYE. HE FINISHED HIS SHIFT, WHEN GOT HOME HE THOUGHT HE HAD DIRT IN HIS EYE, WHEN IT WOULDN'TCOME OUT HE WENT TO THE HOSPITAL. SITE CONDITIONRAINY AND COLD.