That sucks!
Don't give up on him. He will just be a bit handicapped.
See how it goes, and hopefully he will be ok.
Is there other fish in your tank besides goldfish? I heard goldfish should only be with goldfish.
An aggressive fish will go after the eyes on other fish so that could be what happened. If you do not think that is possible, than maybe a rock or something in the tank?
Anyway, that eye should start to develop scar tissue....... do not mistake it for fungus... and start to heal on its own.

wow I just found a neon of mine that has one eye. I thought he died after I lost 2 but then found him again a few weeks later still alive lol. Better maybe get rid of someone jus sayin. good luck with that lol

I know what you meant duuuh. But that sounds like a deal there I'd do it too.

My tanks are doing great thanks for asking. The 125 has a dozen cichlids my guppy breeder has several baby's some ready for sale almost. My 55 community is looking the best it ever has! Hows one eye willy? lol