The world that dogs see with their eyes is not in color, they can only see black, white, yellow, blue, and gray. Dogs cannot distinguish colors like humans.

Dogs can distinguish different colors of blue, indigo and violet, but they have no special feeling for red, green and other high colors in the spectrum. Red is black to dogs, and green is white to dogs, so a green lawn is white lawn to dogs.

Dogs have fewer cones than humans, indicating that their color vision is not as rich or intense as ours.

1. Dogs are considered amblyopic, and the color distinction is very blurry for them. Dogs mostly rely on smell and hearing to distinguish people or objects.

2. There are two kinds of color photoreceptors, or cone cells, on the dog's retina, which can distinguish short wavelength and medium and long wavelength light, that is, blue (short wavelength) and red and yellow (long wavelength). wavelength) hue. Humans have three types of cone cells that allow us to see all colors in the visible spectrum. Because dogs only have two types of cone cells, dogs can distinguish the same colors as humans who are red-green blind.

3. But to get the specific situation, we need to prove it through experiments. Dogs' color vision has been tested before. After many repeated experiments, the dogs were shown three light panels in succession, two of which were the same color and the third was a different one. The dog's task is to find the different pieces and press the button to be rewarded with treats for the correct choice.

Through experiments, scientists have determined that the world in dogs’ eyes includes black, white and gray scales, as well as long-wavelength (red and yellow) and short-wavelength (blue) colors.