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Question
#97887. Swiftclaw
asks:
Are cats color blind?
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BRY2K 
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Although it is commonly believed that dogs and cats see only in black and white, recent evidence suggests that animals may have some degree of useful color vision.
Cats are not color blind - they have the ability to distinguish between blues and greens, but lack the ability to pick out shades of red. The Natural History Museum of L.A. has online images demonstrating how cats view the world.
Cats, like humans, have two primary structures in the retina of the eye for perceiving light: rods which help us see light and dark areas, and cones which have pigments to detect particular wavelengths of light.
At low light intensities, rods function to distinguish light from dark. You may notice that you see little color in dim light. At high intensities of light the rods do not function, however, the cones do. Humans have three kinds of cone pigments, ones that can detect red, green and blue light.
 http://www.madsci.org/posts/archives/1998-08/903122934.Zo.r.html
http://www.veterinaryvision.com/See.htm
Jul 24 08, 5:32 AM
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