ELECTRICIAN, WORKING THE NIGHT SHIFT WITH OTHER MAINT REPAIRMAN WAS CHECKING THE FUNCTION OF THE #5 KILN GRIT SCREW, WHEN LOOSE DUST FELL OFF THE FIRING HOOD OF #5 KILN. THE DUST FELL DOWN ONT O HIM AND GOT BEHIND SAFETY GLASSES INTO HIS RIGHT EYE CAUSING IRRITATION. IRRIGATION WITH FIRST AID SOLUTION DIDN'T RESOLVE THE BURN AND FURTHER CARE AND RX DROPS REQUIRED LATER IN THE DAY.