Siamese cats are sometimes cross-eyed due to the abnormal uncrossed wiring of their optic chiasm, the part of the brain where the optic nerves partially cross, with those parts of the right eye which see things on the right side connecting to the left side of the brain and vice versa. In some Siamese cats, this wiring is disrupted because there is not enough nerve crossing. In order to compensate for the lack of this connection in their brains, cats with this defect will cross their eyes. Albino tigers sometimes suffer from a similar condition.