WHEN THE OPERATOR LEANED OVER TO TURN AIR CONDITIONING UNIT, DUST BLEW OUT OF THE VENT INTO HIS FACE, GETTING DUST PARTICLES IN HIS LT. EYE. EE WAS WEARING SAFETY GLASSES AT THE TIME. EE WAS SENT TO E.R. WHERE METAL OBJECT WITH RUST RING WAS REMOVED FROM HIS LT. EYE AND OPTHALMIC MEDICATIONS WERE ORDERED.