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Color blindness - Wikipedia, the free encyclopedia Color blindness, or color vision deficiency, is the inability or decreased ability to see color, or perceive color differences, under normal lighting conditions. Because of the way their eyes are built, dogs have trouble distinguishing between certain colors.
All this information comes from research – both from actually looking at the dogs’ eyes under a microscope, and from watching how dogs behave.
Dogs, most likely, see the world in the colors of deuteranopia, though it’s not the perfect representation of what we know, or what we think we know, about dog vision.

However, very few can discern colors quite like Concetta Antico, a San Diego-based contemporary artist.
They also see colors less strongly so than humans (because of the smaller number of cones). It allows dogs to distinguish between more shades of grey (two greys very similar to each other for us can be seen as very different greys by dogs), as well as see in the dark better than humans (larger pupils also help in this, allowing more light inside), and to detect movement much better than we do.
While you may often hear or read that dogs “suffer” from deuteranpia, it’s not the most fortunate use of the word “suffer”. Dogs have fewer cones than us, and only two types of them (compared to three types for a typical human).

What we see as red, orange, green, purple, dogs perceive in various shades of grey, or even black (those nice, red and orange toys, for example). For dogs, one type peaks at yellow-green range of the light spectrum, and the other at the blue-violet range. Color blindness is a name for any kind of color vision deficiency, but it does not mean that one can’t see any colors at all.

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