If it's pop eye, cosed by air behind the eye, I have solved this problem by catching the fish "in my case it was a unicorn tang" put him in a small shallow container of tank water, " just to keep him wet on one side" then you'll need a good Suringe with a sharp, fine needle. Poke it in the air bulge and draw out the air. you may want an assistant for this procedure to keep him/her still.
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