EMPLOYEE WAS ENTERING CEMENT SILO #2 THROUGH A MANHOLE TO PERFORM NECESSARY MAINTENANCE WHEN DUST CIRCULATING INSIDE THE SILO GOT IN HIS EYES AND HE LOST FOOTING. HIS FEET SLIPPED OFF MANHOLE AND HE PULLED HIS RIGHT SHOULDER WHEN HE CAUGHT HIMSELF. EE SAW DOCTOR ON 4-12-02 AND WAS PLACED ON LIGHT DUTY.