Domesticated cats with blue eyes and white coats are often completely deaf.[3] Deafness can occur in white cats with yellow, green or blue irises, although it is mostly likely in white cats with blue irises.[4] In white cats with mixed-coloured eyes (odd-eyed cats), it has been found that deafness is more likely to affect the ear on the blue-eyed side.[3] White cats can have blue, gold, green or copper coloured odd eyes.