Help needed - 2 Chickens died

[nvrgivup]

Hi. I am at a loss.
1. I chicken was weak then dead. About 4 years old. No real symptoms.
2. Chicken that was perfectly fine, then I noticed she was sitting in the coop, 2 days in a row. Last night, I checked on her and both eyes were sealed shut. I rinsed her eye with water and the one opened. But she died today.,... pictures included.
3. I have 3 others that are wobbly. One had a sealed eye this morning. I did clean it and it popped open and she came out of the coop today.

It seems from every Clutch, at least one is wobbly.

I want to figure this out.
Any guidance is appreciated.

 

[Fluffy_Feathers]

I know that respiratory illnesses will make chicken's eyes crusty and their face swollen, and some are contagious. But as for the wobbliness and lack of symptoms in the first chicken, I'm not sure.

Hopefully someone with a bit more knowledge replies. I'm sorry for your losses