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004. Dog Vision




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This article is from the rec.pets.dogs: Assorted Topics, posted to rec.pets.dogs newsgroup. Maintained by Cindy Tittle Moore with numerous contributions by others.

004. Dog Vision

Excerpted from: Vaughan, Dana (Ph.D.), "Canine:Color Vision," _Gazette_, May 1991:

The article explained the following about "color vision" in dogs/people:

Normal Human Color range includes VIBGYOR (each letter is a color Violet-> Red). The normal ability to see this wide range of color is due to the presence of three cone cell types: blue, green and red cones.

The range of colors seen by deuteranopic (green-blind) humans and dogs are probably the same. Color Vision in the VIB portion of the spectrum is normal. However, both deuteranopes and dogs lack the green cones and thus have a color vision deficit in GYO portion of the spectrum. This means that blue-green appears white. Colors more toward the Red (R) portion of the spectrum appears more and more yellowish. Red itself thus appears yellow. Hunters take advantage of this by using bright orange bumpers while training: it's difficult for the dog to actually see the bumper while the trainer has no trouble spotting them.

Note that it is difficult for a dog to distinguish between objects which are green, yellow and orange. Note also that the colors red and orange are hard for a dog to tell apart, but that "red" is easily distinguished from blue. Thus dogs are colorblind, but not to the extent of seeing only black and white.

 

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