White eye is probably a flexobacterial infection. Anti-Biotic Injections are curative. In other cases, a fish will have traumatized the eye in some way and the lesion is corneal edema.

In these cases, injections of antibiotics will be harmless, but only time resolves this lesion, Finally, White eye may be the result of caustic trauma. It's not rare to see a group of fish which were overdosed with Formalin or burned by Ammonia to develop white eye.

Again, some Stress coat, salt and an injection never hurt these fish.