I've got a few rhode island reds that are 3 years old, and one araucauna.
they also have this symptom of swollen looking eyelids (not really impacting vision) and occasionally shaking heads.
i don't see any discharge or eye bubbles. we're on day 3. things don't seem to be getting much worse or changing.
we do have some poison ivy that's somewhat near where they rummage around in the yard.
so I've been trying to figure out if they potentially got into it. (are chickens affected by poison ivy/urishiol?)
or - if this is truly a respiratory disease that needs TYLAN.
let me go out and get some pics.