Pupils are different sizes...really?

[phatchicken]

Howdy - my 2 year old silver Wyandote has one pupil dialated and one constricted. She seems to be able to see out of both eyes, but I am concerned because my other Wyandote - same age, same breeder, has gone blind in one eye. Is this some sign of a funky chicken disease? (no pun intended...)

 

[hinkjc]

Look up Marek's on the net and research ocular mareks pictures. This affects the eye and can cause blindness. This is a contagious disease..no treatment.