EMPLOYEE WAS MAKING PREPARATION TO ASSIST CO-WORKERS IWTH FITTING TOGETHER TWO VESSEL PIECES. HE AHD HIS HEAD RAISED AND WAS LOOKING UP TOWARD THE TOP OF THE VESSEL, WHEN A CLUMP OF GRINDING DUST MATERIAL FELL FROM THE VESSEL ABOVE AND STRUCK HIM BETWEEN HIS FACE AND SAFETY GLASSES RESULTIN GIN THE GRINDING DUST ENTERING HIS LEFT EYE.