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How dogs see the world compared to humans

Most people know that dogs don’t see as well as humans, but there are a lot of misconceptions floating around about the way they see the world. But now a small web app, first uncovered by The Next Web, can show you how the world looks through your pooch’s eyes.

Dogs, contrary to popular belief, do not see the world in black-and-white. Their vision is actually most similar to people with red-green color blindness. But there are other ways humans differ from dogs as well, including less sensitivity to both brightness and variations in shades of Grey.

Dog Vision tries to take these factors into account. Simply upload a photo and in a few moments the app will show you how your dog would see that scene. Here are a few ways the photo will change.

Colors: Humans (and dogs) have two types of color receptors: rods and cones. Rods handle peripheral and night vision — brightness and shades of gray. Cones deal with day vision and color perception. Each of the cones detects a different wavelength of light, and through using our three types of cones, humans can detect a full spectrum of hues (in a similar way to how you mix primary colors in paint).  Dogs only have two types of cones (like red-green colorblind humans), and this makes their color vision very limited.

Near-sightedness: Dogs are also very nearsighted compared to humans. A special test, custom-made for dogs, puts them at around 20/75 vision, according to Psychology Today. This means a human could barely see at 75 feet is what a dog can just about make out at 20 feet. Brightness discrimination: Dogs are substantially worse than humans at determining difference in brightness, or looked at another way, different shades of objects. In fact, dogs are twice two times worse at differentiating between shades than humans are. But if you start to get sad for the pups, just remember your dog has an incredible sense of smell that basically lets it “see” the world in different scents.

Soure: http://www.businessinsider.com/how-dogs-see-the-world-compared-to-humans-2015-7

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