So im thinking if the eye started just after he flipped over he could of hurt it on the substrate or got something in it and maybe that's whats causing him to close his eye. And if he only flipped the one time and you didn't see how it happened is it possible maybe he fell off that hut or was trying to escape and when he was pushing himself against the glass maybe he tumbled over. When you found him was he by the glass or by the log? Is there anything else in the enclosure he could have knocked himself over on? And im thinking if you still have not answered if your giving him a multivitamin yet that your probably not. His multivitamin and calcium with d3 are things he absolutely needs. And if you haven't given him any since you got him I will bet that is a huge contributing factor to whats going on. And again if you are given it please disregard that last part. IF you got him as baby the first couple months he should have got calcium and d3 every second feeding, which food should have been offered every night as a baby. And the multivitamin should have been once a week for the first couple months.