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I had a hen with an eye like that and it was Conjunctivitis. She also had Sinusitis and MS (Mycroplasma Synoviae). I had planned to cull her because she became blind from the disease(s) but she died on her own even with antibiotics. It is hard to say what it could be without a vet having a look. If you do cull, or if he dies, you may want to get a necropsy done to find out, as MS can affect the whole flock and any new birds you get will eventually get it.
If you want to treat him, try to find antibiotics- Tylan, Duramycin-10, there are several that may help.
Thank u for replying. I am 98% sure he is getting put down. It's very sad, he is very loved by many, but I think it is best for him. He does not act, or seem well at all.
