Cats cannot see directly beneath their noses. You can test this by offering your kitty a treat, such as Pounce. He can smell it, but if you drop it directly beneath his nose, he'll have to root around a bit before finding it.
Itsy, Bitsy, Teenie, Weenie
Rumors aside, cats are not colorblind. Their ability to see color is not as enhanced as ours, but they can see some colors.
Wizard
If normal human vision is 20/20, then that of the cat is 20/100. He has keen vision for objects far away, but things up close may appear fuzzy or blurred. Perhaps this is why cats do the sniff test when greeting friends.
Harley
Most white blue-eyed cats are deaf. A white cat with odd-eyes (one blue and one green or gold) will most often be deaf on the side with the blue eye.
Bishop
Cats "Kiss" with their Eyes. Have you ever noticed your cat gazing at you for a long moment and then slowly blinking his eyes? That's the kitty equivalent of a kiss, and you should feel very flattered. Of course, a nip on the nose is also their way of giving a kiss. If you want to show your cat you love him, give him a kitty kiss right back. No, not on the nose. Just give him that long stare and slow blink and see what happens.
