White cat with blue eyes
Some white cats suffer from congenital deafness caused by degeneration of the inner ear.[1] This condition is associated with blue irises. In white cats with mixed-coloured eyes (odd-eyed cats), it has been found that deafness is usually limited to the ear on the blue-eyed side. White cats can have blue, gold, green, or copper coloured odd eyes. In one study of white cats with varying degrees of hearing deficiency, 72% of the animals were found to be totally deaf.
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