If his eyes look like this this is what I would do:)
1. Get a heater and raise them temp to 78F.
2. Get maracyn 2 use that as directed.
3. Use 1/8 of a teaspoon of Epsom salt per 5 gals of water just once with the whole treatment of Maracyn2.
This should be about a weeks treatment.
Then if you can go to http://www.goldfishconnection.com and get the Medigold this is an anitibotic fish food to help this.