My 10 yr old chinchilla, Puffy, has had crusty watery eyes for a very long time now - years actually. It's especially noticeable when he's just waking up when the crusts around one or both of his eyes (it's always changing) is bad enough that he can't open his eyes. They often appear swollen, droopy, and baggy underneath. There's nothing as cute as a wide eyed chinchilla exploring the room and looking up at you in adoration ;-), but Puffy's eyes always seem half closed like he's been out partying all night. At first I was concerned about malocclusion but he eats just fine. I keep his dust bath available to him at all times and besides the eyes he seems very healthy. What might this be and what is the treatment?