A Clinical Case from the Archives : 24/09/2008

This quarterhorse has been referred after its retinal health was, quite rightly, questioned in a pre-purchase examination. What do you see and is it part of normal variation or something abnormal?

The little white dots around the optic nerve and in the non-tapetal fundus here are, in my book, abnormal as are these little ‘doughnuts’ of hypopigmentation seen in the other eye. They may be the result of a herpesvirus infection ages ago (we saw the same thing in horses experimentally infected with EHV-1 in a study with Josh (now Professor!) Slater years ago) but the key thing for the vetting is that the retinas are quiet and the changes should have no effect on vision now or in the future.


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