I've been dealing with a similar situation for the last 3-4 weeks - see here:
https://www.backyardchickens.com/forum/viewtopic.php?id=249747
After making that post, I kept researching - I waited a week and ran her thru a course of sulmet, thinking possibly coryza, and it did nothing. I finally spoke to my vet, who prescribed Baytril injections - she is currently on her 6th day of this, and so far, it hasn't helped at all. The rest of the flock is fine, as is this hen (still acting/eating/drinking/pooping normally), except for this huge bulbous eye.
I'm sure this has to do with more bits of pine shavings being lodged in her sinus cavity or an abscess, but I won't know for sure unless it is opened and drained - which is more than likely what will have to happen. And my vet agrees.
My point tho, is that I freaked out when I first saw my hen with this eye, thinking my flock had some nasty disease, just like some people here did when they saw that first pic in this thread. Had I posted a pic in my original thread, I'm sure I would have received the same reaction. I've learned tho, not to jump to conclusions or take drastic measures when you're presented with something like this and don't know FOR SURE what it is - just try your best to keep a level head, take all the necessary precautions to protect the rest of your birds, and if its beyond any home treatment, get a professional diagnosis, and go from there. Simple as that. So for God's sake, don't start culling birds and burning their bodies til you know for sure that's the only alternative!!
That said, maybe this chicken has a piece of foreign matter lodged in her sinus cavity, that's just been left untreated too long? And maybe its a weird coincidence that the one from last year had the same thing? We don't know for sure, of course, but I'm just saying - it COULD be a possibility...
