I have a hen that started acting a little off. She I was feeding her extra goodies and separated her. She would walk around a little and then just sit a lot in the garden. She was eating more and she eventually went back with other chickens. I noticed it was taking her longer to come in at night and then she would come so far and just sit and I would bring her in. After a couple of times of this I started watching and I realized she could not see. I put my hand near her eyes and no reaction. I separated her and put her back in the garden. I noticed her legs were weaker. She stands up a little bit and doesn’t walk far and uses her wings to brace her to sit down again. I was giving her poultry drenched and didn’t notice any change. I feel at evening when lights are low she can see a little bit. She will grab the corn kernel out of the dish and leave the pellets. I can bring my hand close to her face and she doesn’t flinch or anything. Is there a specific vitamin or something I could give her to regain her vision? Also anything for her legs? Does it sound like some type of vitamin deficiency? Her eyes have no discharge etc. there is not excessive smells in coop of ammonia etc. thanks for any help.