NAVLE® Question of the day

A 12-week-old chicken from a young backyard flock is presented for evaluation because of weight loss, decreased appetite, and diarrhea.

The irises in the affected bird are lighter than normal with irregular pupillary margins, and the hen does not have a normal pupillary light reflex. Several other young birds appear to be growing poorly compared to the rest of the flock.

The image below is an example of what the affected bird's eye looks like, vs. a normal eye on the left. 

Based on the presumptive diagnosis, how can this problem be prevented going forward?

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