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Investigative Ophthalmology & Visual Science, Vol 19, 475-486, Copyright © 1980 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

Ocular pigmentation in white and Siamese cats

LN Thibos, WR Levick and R Morstyn

Ocular pigmentation in white cats with blue and yellow eyes and in Siamese cats was examined ophthalmoscopically and histologically. Yellow-eyed white cats had entirely normal ocular pigmentation. Blue eyes of white cats had normal pigmentation of the iridial and retinal pigment epithelia but no stromal pigmentation of the iris or choroid. This deficit is apparently due to the absence of stromal pigment cells, certainly in the iris. As a general rule, the blue eye of white cats had no tapetum. Siamese cats had reduced pigmentation of the iridial and retinal pigment epithelia and no stromal pigmentation of the iris or choroid. The lack of pigmentation is apparently due to the inability of stromal pigment cells to produce pigment, certainly in the iris. We conclude that the abnormality of visual pathways previously described in the Siamese cat is not due simply to a deficiency of pigment of cells of neural crest origin.


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