good news about Pia.
yes, I have an idea about Nugget's eye:
I stayed up late last night reading a book which just arrived in the mail : Poultry signals. Its a dutch book, part of a series, that uses the idea that you need to observe the signals your flock gives to provide "bird focused poultry farming". Aimed more at large poultry farmers who are rearing hens, or doing egg production, but was very informative. I would recommend it you can get it from ACRES. I learned a lot - for example, if you pick up a chick or young pullet by the wngs, the feet and toes should point downward. If they are drawn up towards the chest, it means the hen has stomach pain and you might think about cocci.
Anyway, about Nugget: there was a picture of a hen with an eye just like Nuggets, and the caption said it was a "serious eye membrane infection" accompanied by swollen sinuses. It didn't discuss it any further. But, if you treat on the basis of infection, maybe tht is the way to go. Personally, I'ld call up your university poultry dept and find someone who would talk to you - or a vet -. Am guessing you could put any antibiotic eye ointment or bacitracin in her eye, but would want to check in case there is something about chickens that makes that particular ointment a bad idea. And immediately I would feed her fresh crushed raw garlic, a good sized clove, and keep that up for a week running.