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  • Title: Evaluation of zones of iris hypoplasia in horses and ponies.
    Author: Buyukmihci NC, MacMillan A, Scagliotti RH.
    Journal: J Am Vet Med Assoc; 1992 Apr 01; 200(7):940-2. PubMed ID: 1577645.
    Abstract:
    Mass-like lesions of the iris were evaluated in 15 horses or ponies of various ages and breeds. Breed or gender predilection was not found. These lesions were most often found in blue irides at the 12 o'clock region. Because the lesions transilluminated and changed shape rapidly with changes in pupillary size, they were hypothesized to be zones of iris hypoplasia. Histologic evaluation of one specimen supported this interpretation. The lesions were not associated with any other ocular or systemic abnormality.
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