I have a pair of silkie chickens who are about a year old. THe hen had her first eggs this summer and I was not sure if the eggs were fertilized. When she went to sit on them I was going to let nature take its course. Prior to sitting on the eggs, Twiggy was a very alert, clever, active and quick hen. I let her sit on the eggs for too long. When she did finally decide enough was enough, (5-6 weeks) she was very different. SHe progressively seemed to lose her vison, and sense of balance. I did as much research as I could and found that giving the polyvisol childrens vitamins was recommended (thinking that she had a vitamin deficieny from not eating enough while on the eegs) SHe is able to find her food and water and follows her friend around and seems otherwise healthy. I feel so sad when I see her now because she looks lost and in a fog. I miss my old Twiggy and need help and advise to solve this problem. Unfortunately there are not any vets who treat chickens in my area.