3 days ago when doing my regular maintenance I noticed one of my chickens (Welsummer hen, about 2-3 years old) had a large amount of puss under the eyelid of it's right eye. I immediately brought it in and carefully cleaned out it's eye with bottled spring water and tweezers, I wanted to keep an eye on it so I set up a cage in my garage using some hay I use for food for my other animals (I didn't have any clean wood shavings or I would of used that) and gave it food and water, I made a note to check on it every 6 hours. over that first day it seemed alert and was walking around, over the second day it appeared to be resting (It was on the thin side of my flock and it's winter feathers hadn't quite finished coming in) I was worried it was too cold in my garage (~1-5C) for it so I moved it to my basement where it's much warmer (room temperature). A little later that day I noticed it's head was strained on it's back. I decided to attempt to wake the animal only to find it wasn't asleep and it's started failing backwards, stumbling on it's hocks and in a constant state of falling backwards. I talked to some other chicken-keeepers I knew and they suggested it was a vitamin e deficiency , so I took a gel capsule of vitamin e, cut it open and used a syringe to give it about .1 ml of it, plus I took a mortar and pestle and ground up of some of it normal layer pellets and put that in it's beak plus some water and made sure it swallowed. As of this morning it's head is no longer stuck to it's back but rather it's under it's chest on the ground. it appears to be standing at some times but it still remains mostly sitting.