EMPLOYEE SUFFERED CHEMICAL BURNS TO HIS EYES. HE WAS CLEANING A SCREEN BOX AND PULLED ON THE FULLY UNROLLED HOSE TO WASH THE SCREEN BOX DOWN. AS HE PULLED THE HOSE, IT SUDDENLY SPRAYED HIM I N THE FACE. HE INDICATED HE DOES NOT KNOW IF IT SLIPPED FROM HIS HAND OR THE HOSE HUNG ON SOMETHING THAT CAUSED THE NOZZLE TO TURN UPWARD.