EMPLOYEE WAS ATTEMPTING TO CLEAN A SCREEN THAT HAD BLINDED OVER WITH A CHIPPING HAMMER. WHILE DOING SO THE EMPLOYEE SLID HIS SAFETY GLASSES TO THE LOWER BRIM OF HIS NOSE, CONTINUING TO CLEAR THE SCREEN THE HAMMER THE EMPLOYEE WAS USING STRUCK SOME MATERIAL THAT FLEW UP AND STRUCK THE EMPLOYEE IN THE EYE.