If you keep the water nice and clean the injury may heal up all by itself, and there is something to be said for not using chemicals and medications when it can be avoided.
That said, treating the tank with 1-2 teaspoons per gallon of aquarium salt and a few doses of Erythromycin (Maracyn) will likely help the eye heal up quicker and protect against any possible infection. Certainly, if the eye worsens, I would treat the tank in this manner.
-Sam
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