Sorry to be the bearer of bad news (depending on how you look at it), but there is no pivotal “Pesty shoots Bazooka in the eye” strip. Bazooka Joe never lost his eye to begin with. Seems back in the 50s (when Bazooka comics began) eye-patches were all the rage. The creators felt adding an eye-patch to the B-man would give him a more distinctive look.
FYI…jury is still out on if Mort actually has a bottom half to his face.