EE WAS WELDING A 14"" X 20"" CARBON STEEL PATCH FOR THE OUTER WALL OF A CIP TANK. WHILE WORKING OVERHEAD APPROX 4' OFF THE CIP FLOOR ON THE BOTTOM FILLER WELD A SMALL SPECK OF STEEL BECAME LODGE D INTO LEFT EYE. EE DID NOT IMMEDIATELY REALIZE THAT THE EYE HAD BEEN INJURED & FELT THAT IT MAY HAVE HAPPENED WHILE CHIPPING SLAG.