An odd-eyed cat has one blue eye and one eye either green, yellow, amber, or brown. This is a feline form of complete heterochromia, a condition that occurs in some other animals, including humans. There is also sectoral (partial) heterochromia, where two different colours occur within the same iris. The condition most commonly affects solid white cats, but may be found in cats of any coat colour.
An odd-eyed blue and white cat
An odd-eyed cat showing complete heterochromia (amber and blue eye) and sectoral heterochromia in the blue eye (partially brown-coloured)
A rare predominantly black cat with odd eyes
A typical example of an odd-eyed solid white cat
Ojos Azules was a breed of shorthaired domestic cat with unusual blue or odd eyes caused by a dominant blue eye (DBE) genetic mutation. The breed came in all coat colors; however, only particolors, colorpoints, and intermediate colors with a characteristic white tail tip were permitted. The breed also had a semi-longhaired coat variety, the Ojos Azules Longhair. Due to the lethal side effects of the Ojos Azules gene, breeders stopped working with this blue eye mutation.
Red broken mackerel tabby Ojos Azules cat
Modern dominant blue-eyed black tabby kitten of the Celestial experimental breed, which is approved by Livre officiel des origines félines (LOOF)