I have had chickens on our property for close to 4 years now and have had very little issues health wise. But this last week our year old Black Orpington Roo started acting lethargic, standing around kind of hunched, stopped crowing and didn't seem to be eating or drinking. We took him to the vet and with the exception of lice, she could visually see anything wrong with him. She sent us home with an antibiotic. We have been treating him for 3 days now and we dusted him for mites. I tube fed him some electrolytes and probiotics twice now. Its been hot here, over 100 degrees so I have him in a very large dog crate in the house. He woke me at 4am crowing this morning and he is definitely feeling better.....but it appears that he can not see. Pecks oddly at the ground (looking for food) and does not flinch when we come close to touching his pupal. Everything on him looks normal including his eyes....any ideas?