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It causes blindness, but in the chicken I owned that had it, she didn't appear to be affected. However, some of the young birds in my flock had to be culled for the neurological form of Mareks. Not sure if the cases were related or coincidential.

Yep, looks like occular Mareks.

Sounds more like ocular Mareks. It’s a less dangerous form of Mareks that causes one or both eyes to turn grey and the pupil to become irregular. It’s fairly safe, other than possibly causing blindness, but is not hereditary. Here is a slightly disturbing image of two eyes, one that doesn’t...