In our eyes, the world is colorful and fascinating. So do you know what the world looks like in the eyes of pet dogs? It is completely different from us. Interested poop shovelers can come and find out. The results may surprise you~
There is a difference between the world seen by dog eyes and the world seen by human eyes. Many things dogs see are blurry, but dogs have good vision at night. Human eyes have 3 types of cones that can perceive 3 colors, but dogs only have 2 types of cones, so dogs are red-green blind. According to the Ishihara color blindness test, it was found that dogs react the same way as humans who are red-green blind. Many things dogs see are blurry, and their visual sensitivity is 4 to 8 times lower than humans. That is, if humans can see images 23 meters away, dogs can only see 6 meters away.
From this conclusion, dogs seem to be a little short-sighted, but in fact, if the object is about 35-55 cm away from the dog, the dog often cannot see clearly. Therefore, if you are looking for a still object that is relatively close, the dog usually needs to use other senses to help it "search" for it. In other words, it needs to smell to locate it. Of course, we cannot arbitrarily conclude that the dog is farsighted.
Dogs have a wider field of vision. Dogs have a large number of rod cells in their eyes and can see stationary objects within 600 meters and continuously moving objects within 800-900 meters. Rod cells are sensitive to weak light and sensitive to moving objects. Therefore, when it is dark, dogs’ vision is much better than that of humans. This is why there are watchdogs. They can see dangers at night that humans cannot. At the same time, dogs have a wider field of vision than humans. Human's field of vision is fan-shaped, with the visual axes of the two eyes being parallel, while a dog's field of view expands to both sides, with the visual axes spreading out by about 20°. Therefore, a dog's field of view can reach 240°-250°, which is nearly 60°-70° larger than that of a human.