Renewable Revolution

Do Dogs See Everything in Black and White?

Dogs do not see everything in black and white; however, they do not have a full spectrum of color vision like humans. The ability to see different colors is a result of neuron cells in the eye that send signals to the brain after recognizing a color.

Human eyes contain three types of cells that detect color, known as cones, while dogs’ eyes only have two cones. This allows dogs to view shades of yellow and blue, but not any colors on the red to green spectrum. Since dogs don’t have the cones that detect red and green, their neurons don’t make any signal to the brain and the default is for the brain to perceive it as shades of gray.

More about animal vision :

•While the human eye is composed of one lens, the bee has thousands of lenses that allows it to spot flowers with nectar while flying.

•Snakes have sensory tools between their eyes and nose known as pit organs, which gives them the unique ability to see the infrared light from the heat of nearby prey.

•Cats’ daytime vision is estimated to be around six times blurrier than human vision.

http://www.wisegeek.com/do-dogs-see-everything-in-black-and-white.htm