It appears to protrude from the socket under the eyelid. When it is open, it is very milky and has pus in it. They have been on antibiodic for about a week and not much change. It seems like we have had our flock on antibiodic more than not this year. Respiratory problems are usually caused by dust and moisture in the henhouse, or by conditions which make the birds more susceptible, such as drafty or damp quarters.
Coccidiosis is a disease usually brought on by unsanitary conditions.
Infectious coryza often causes eye swelling and is very common. Roup is caused by a deficiency of Vitamin A and produces swelling and cheesy eye discharge. I would start one of these latter supplements in the water as soon as possible. Get back to us on these other questions and we will try to help further. This is a private posting area.