Have you wondered why some cats seem to be cross eyed? Is it because they are concentrating on something a bit too intensely?
The cross-eyed condition (also called strabismus) is in fact mostly genetic. The muscles that attach directly to the eyeballs are not exactly of the same length on each opposite side.
When the eyeball moves, its motion is influenced by those small muscles. They position the eyeball to slide from top to bottom or side to side. However, in certain cases, one muscle may be longer or stronger than the one on the opposite side of the eye, this causes the eyeball to deviate off the correct direction. If the eyes deviate towards the nose, the cat is cross-eyed.