Backstory: 2 chickens went mostly blind 4 months ago around the same time. Cloudy eyes but pupils stayed perfectly round and no other symptoms since. Just mostly blind and living their best life. Last week, in a pen across my yard, I found another chicken with cloudy eyes and mostly blind. There is a white dot in the middle. Today, She isn’t doing well. I found her laying down with her head under her wing. There are no other symptoms. No discharge, no bubbles, no pus, and no worms. One eye is stays shut a lot of the time and she is a little lethargic. I know of all the things that it could be, but nothing fully adds up to one thing. What could be going on?