I know
@Wiebke but as there is no obvious eye injury then there doesn't seem to be much else it can be (in my non expert opinion). She mentioned trauma and asked if he has banged his eye on anything- he's not banged his eye on anything that I have seen and most of the things in his cage are soft so I don't see how he could have banged it on anything. Unless anyone else has any ideas of other possibilities?
I've only just thought about this now but as we have been flushing with f10 and applying manuka honey to his abscess, could it be possible he's ended up with either of those in his eye somehow? Although I don't think he can reach his abscess with his eye. How about if while flushing his abscess some f10 splashed his eye? I do cover their face when flushing as sometimes it can squirt a bit but he is very wriggly.
Also the vet said I can now stop flushing and leave to finish closing as the majority is healed. Does this sound right? I thought I was supposed to be flushing and keeping open as long as possible