Okay, this is probably the first real case of 'mystery chicken disease/illness' I've ever experienced. I brought a new Ameraucana hen + rooster home. They were plump and healthy and merged easily into the flock. A month later I found the hen, Willow, listless on the roost mid-day. I picked her up and she's skin and bones, her eyes were gummed shut. I'd been moving and not spending a lot of time with the flock, so I didn't see it escalate. I cleaned her eyes, got them open, and expressed some soft but solid white... gunk... maybe puss? But no smell, no other drainage, not yellow-ish, no blood. Her eyes are not irritated or red or swollen. She is not coughing or sneezing or wheezing. She has no nasal drainage. Her bum is clean and her poo is normal. She does not smell. I isolated her for 3 weeks. The first week I had to re-open her eyes daily. Every day more 1/8 - 1/4" pats of soft white gunk were removed. It forms/comes from the front of the eye cavity, behind the beak, in that inner top-most corner of the socket up above her eye. After the first week her eyes stayed open. As long as she could see she had a good appetite. The second week I continued to remove eye gunk every few days. By the end of 3 weeks she was very active, eating very well, and had no more discharge/gunk. So I put her back in with the flock. 4 days later she's acting listless again. I checked her eyes and there's more white crud forming up in her eye socket. She's still getting around and eating, but she's also still thin as a rail. I have no idea what this is. There are no other symptoms, no other issues with her. She's an older pullet, not mature yet, so she's not started laying. I have about 60 birds; ducks, turkeys, chickens, and pigeons. I have zero health issues in any other bird, including the rooster she came with. The flock is fat, happy, and laying. Additional backstory; I just sold my house and am in-between land, staying on a friend's farm. She likewise has a few dozen chickens and turkeys. Her birds are all a picture of health, EXCEPT one chicken I call 'one-eyed Sally'- Sally has what looks like an advanced state of this going on. Her eye has been consumed by this white spongy fluff and it just sort of surfaces and falls out, like a gross geyser. The affected eye is grossly swollen. There is no smell, no blood, and Sally is otherwise healthy and fat- not laying though. I don't have the stomach to doctor her or inspect it, it's gnarly. Her keeper doesn't doctor chickens at all, so Sally is on her own. So, I want to rule out viral because only 2 out of 100+ birds have this. They've all been together for over 2 months now. If it were a matter of an incubation period Willow wouldn't have contracted it within a week or two. I want to rule out infection because there is no smell, no drainage, no inflammation, no blood, no sneezing, no wheezing, no coughing. One-Eyed Sally does have a lot of swelling but no other symptom. I am not a fan of busting out the meds 'just in case'. You may disagree with me, and that's okay, I'm not here to argue the point with you. What I'm here for is to try and figure out WHAT this is and how Willow came to be struggling with it. From there I will address further medical action. Please respect my disposition on this; I'm not going to try and convert you to my chicken-keeping beliefs, and I don't need you trying to likewise do the same. TIA for your thoughts on the mystery eye gunk!