I'll keep my fingers crossed for everyone's hens .
Seminolewind, don't forget that I have that black astrolorp with a grey eye. Her sibling had the same, I sent her in for that necropsy a couple of months ago and the vet said it wasn't mareks. So the suriving BA is doing fine - whatever is going on with her eye. She is lightweight, but her comb is pinking up a bit. I'll hope the same for your polish hen.
I started feeding tumeric. It seems a bit expensive online, but I found in Indian grocery stores you can get it for cheaper. Right now I'm finding it for $13 for a 3 lb bag. Only trouble is, it stains like the dickens. When I forget to wear gloves, my fingernails turn yellow and look disgusting. The flock doesn't seem to mind it - they will prefer the food that isn't dosed with the tumeric but will eat and finish up the tumeric food. I am experimenting with the amount and still researching to try to find more about what the critical point is (how much tumeric do you need to make a difference?)