Kittens can see almost as well as humans with 20/20 vision can. In some ways, kittens can see even better. Kitty vision is designed to aid in hunting. Consider these interesting tidbits:

• Kittens are slightly nearsighted so that they can focus in on a nearby mouse or lizard rather than distant prey.
• Kittens' retinas have more rods than cones. (Rods are the cells used for nighttime vision; cones are the cells used for daytime sight and seeing colors.) Having more rods helps a cat see at night, enabling him to pinpoint sudden motion with his peripheral vision. (Of course, having fewer cones means that your kitten can't see colors as vividly as you do.)
• Your kitten has large, elliptical pupils that contract and dilate much faster than your round pupil can. Because of its size, the kitten's pupil lets more light in. His eyes have a tapetum membrane that reflects light through a second time in the opposite direction creating a visual double exposure of light (this is why your kitten can hunt in near darkness). The yellow glow seen when light shines onto your kitten's eyes is the light reflecting off of the tapetum membrane.