I have a 5-month old vieled chameleon. About a month ago he started keeping his eyes closed almost all day. They didn't look swollen, and he seemed to be able to open them if he wanted to, but he wouldn't. I took him to the vet and they gave me eye drops, they helped for about two weeks, but the past few days, he's been keeping them closed again. The left one appears not swollen, and I've seen it open, but the right won't open, and sometimes I see stuff stuck in it and I carefully pull it out. What can I do to fix this permanently?