Hey Mel. I would wash it and put some betadine on it. Giving it air time is better than covering it up. Keep a close eye on it for infection over the next few days, as well as any unwellness from him like fevers. Are you absolutely sure it missed his eye? If you have any doubt then get him seen by a doctor so they can look for scratches. Otherwise he could end up with an eye ulcer/scarring.
That is about all you can do I think. Hope he gets better soon.