This is my two year old barred rock. Noticed both eyes had pupils that where smaller than the other chickens. She seems healthy otherwise.
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Her eyes kind of look like first pic. She has no other symptoms, runs straight and fast, get angry with me when I go in the coop at night and shine lights in her face. I have owned her about 1.5 years now and she was 6 months to a year when I got her.It is hard to say... Maybe you can share your photos in this thread and get second opinions...https://www.backyardchickens.com/t/741957/not-an-emergency-mareks-in-the-flock
It does look like she has some miosis in her pupil shown. If it does not react to changes in light (especially at night, from very dark to very bright) then that is a red flag to me.
(neither of these photos are mine)
See this image of pupil miosis in a Marek's chicken:http://partnersah.vet.cornell.edu/a...las/files/avian_atlas_assets/MD-009A x420.jpg
Does her pupils have any irregularity to the shape? Are they perfectly round, or slightly off? This is what I mean by "off" (notice the miotic pupil again): http://i740.photobucket.com/albums/xx48/jkattef/bad_eye.jpg
It is a good sign that she can still see, though. I am not sure what other problems could cause miotic pupils in a chicken. In Marek's, it is due to lymphoids in the eye/brain. Perhaps other types of tumors or swelling could cause it? Does she have any other symptoms?