Kittens do not open their eyes until they are somewhere around seven to 10 days old. They eyes open at one corner and become fully open by the time they are 2 weeks old. Most kittens will have blue eyes. According to "Cat Owner's Home Veterinary Handbook," some kitten's eyes will begin to change colour when they are 3 weeks old. But most kittens' eyes will change from blue to their adult colour in as many as 12 weeks.
Siamese Based Breeds
Many cat breeds that are based on the Siamese--such as the Himalayan, the Balinese, the Oriental shorthair, the colorpoint shorthair, the Javanese and the Birman--are sometimes born with red or pink eyes. They will often be born all white or ivory coloured and do not develop blue eyes or the dark points of their tails, faces and legs until they are about 1 month old. It is normal for these breeds to have blue eyes and good hearing for the rest of their lives. In many other breeds, blue eyes are a sign of deafness.
If the kitten is a purebred, information on the eye colour is needed for the registration form. The Cat Fancy Association recommends waiting until the kitten is about 4 months old before filling out registration papers. By then, the adult eye colouration is usually fixed. Cats can have two different coloured eyes and see well out of both. A sudden change in eye colour after 4 months could be due to illness, and the kitten should be taken to a vet.
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