LOL.
Hey Erick,
I read, somewhere, (possible WWM) that excessive air bubbles (i.e.: such as from turning your pumps on after target feeding, or from doing a w/c with pumps on and air mixed with water flows back into main tank) can cause a build up of gasses in the fish's eye and that can cause this abnormality.
I was going to try to ask this question of the speaker at the October meeting, cause the speaker has a speciality in pathology too. I read that this condition can clear up with time (several months), lessening stress on fish, feeding vitamin enriched foods like seaweeds (spinach was not that far off) can help.
This topic is close to my heart, as my 11 year old yellow tang got this condition last year while I was on vacation. I use to have another pet sitter that told me she had to get "creative" when feeding my tank, as the tang was snatching food away from corals and inverts. I think what that translated into was she may have whacked him with my spear that I feed my anems with. Needless to say, she was terminated as my sitter.
In any case, Pop Eye in my fresh water tank usually resulted in death to one or two of my fresh water tetra fish years ago (I think the cause for Pop Eye in FW fish can be a result of gram negative bacteria). In the reef tank, my tang is making a very slow recovery. You may want to look at some of these things I mentioned, or speak with BARS's October speaker.
Hope this is relevant, helps and your fish recovers soon.
Best,
Joel
R.K.