These curious cats are suffering from a rare condition known as ocular dyschromia, which is literally two different colored irises. Simply put, it's a cat's eyes of two different colors, most commonly blue and green, sometimes with yellow and brown eyes as well. This condition is often seen in cats with white fur, or cats with some white body hair, such as Tuxedo cats and bisexual cats Cat Pirate Jolly Roger Flag Skull And Crossbones shirt. This heterochromia is rare in dark-haired cats, and extremely rare in black cats. Whereas in a normal cat, both eyes will have tapetum lucidum, which is a layer of reflective tissue. In cats with heterochromia, the melanin in the blue eyes will remove some of the color of the reflected light, resulting in a slightly reddened cat's eyes.