Merck Manual

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Advanced Collie eye anomaly
Advanced Collie eye anomaly

    Both choroidal hypoplasia and optic nerve coloboma are evident in this photograph of a sable Rough Collie's eye. The choroidal hypoplasia is lateral to the optic nerve. The optic nerve coloboma is in the central half of the optic disc, where the blood vessels on the optic disc are out of focus.

Courtesy of K. Gelatt.