WHY CATS CAN SEE BETTER THAN HUMANS
Unlike human eyes, which work best in day light, the cat’s eyes must function well in extremely low light conditions as they are an animal which is predominantly nocturnal. In darkness, cats eyes are able to function in approximately one-sixth of the light needed for human vision. However they are also able to function well in daylight. In low light levels, the cats pupil must be able to open as wide as possible, but also be able to contract to very small size to protect the sensitive retina in bright sunlight. In human eyes, this size variation of the pupil is controlled by a circular muscle, but this limits the amount of size variation. In cats however, the same process is controlled by two, shutter-like muscles, which gives the cat it’s characteristic slit-like pupil in bright light conditions. Also, the size of the cats eye is relatively larger than those found in humans and this enables a larger pupil and therefore more light to enter the eye.
OTHER BITS OF CAT TRIVIA
- Cats cannot see directly beneath their noses. You can test this by offering your kitty a treat. He can smell it, but if you drop it directly beneath his nose, he'll have to root around a bit before finding it.
- Rumors aside, cats are not colorblind. Their ability to see color is not as enhanced as ours, but they can see some colors.
- 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.
- Most white blue-eyed cats are deaf (60 - 80%). A white cat with odd-eyes (one blue and one green or gold) may be deaf on the side with the blue eye (30-40%).
- Cats "kiss" with their eyes. Have you ever noticed your cat gazing at you for a long moment and then slowly blinking her eyes? That's the kitty equivalent of a kiss, and you should feel very flattered. If you want to show your cat you love her, give her a kitty kiss right back. No, not on the nose. Just give her a long stare and slowly blink and see what happens!