Without pics its only guessing game as too the issue at hand. I'd say odds are its a foreign object in the turret. It needs to be flushed with plain saline solution. Squirt enugh into the turret for it to fill like a water balloon. Then allow the cham too move its eye around and let the saline drain out. It should flush out any debris. It may take a cpl of times to get it out. If it doesnt show improvement after a cpl of days of flushing it I'd take him to my vet for a check. He may need some terramycin for a slight eye infection. If the eye has goopy stuff being expelled its an eye infection.