The sense of sight is one of the strongest senses. But cats are generally considered colorblind. The retina – the nerve center at the back of the eye – contains cells called cones (responsible for converting light into color) and rods (responsible for black and white). In cats, rods greatly outnumber cones. Theoretically, color perception is possible since the eye contains some cones, however as described earlier, not necessary.
Because of the differences between human and cat retinas, the animals can see using one-sixth of the amount of light people need: At night, for example, objects appear six times brighter to a cat than they do to humans, which helps the animals hunt. In addition to better brightness vision, cats can also detect minute movement, which is easily missed by people - another benefit for a hunter.
This information was gathered from Dr. Jon who writes articles for a website called PetPlace.