Cats can distinguish several colors.

Some people think that cats, like dogs, are color blind and can only see the world of black, white and gray in their eyes. Actually, this is a misunderstanding. Studies show that dogs' eyes can also distinguish blue, purple and yellow. Cats are certainly not color blind. They can distinguish blue, green, purple and yellow.

The following is a color comparison chart that humans and dogs can see respectively. )

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At the beginning of the twentieth century, researchers thought that the world of cats was only gray. Until the 1960s, scientists began to be skeptical about this statement. After further testing, it was found that cats could see some colors. Although cats can't see the colorful world like human beings, they have super night vision ability. The receptors that the eyes can catch light are called photoreceptors. There are two kinds of photoreceptors, cone cells and rod cells.

Cone cells are bright visual organs, which are mainly responsible for visual activities under bright conditions. They can distinguish the intensity and color of light, have high visual sensitivity and can distinguish visual details. Rod cells are dark vision organs, responsible for night vision, including photosensitive pigments that can start the dark vision process, but rod cells do not participate in color discrimination. There are many rod cells in the retina of cats. The ratio of rod cells to cone cells in cats is 25: 1, while that in humans is 4: 1. Therefore, in the dark, cats are more sensitive to vision than humans.

(The picture below shows the images that people and cats see respectively in the dark environment. )

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Cat's pupil is oval, which will contract faster than human's round pupil and larger than human's pupil. In the dark, cats' pupils can even expand to 90% of the eyeball surface, and only weak light is enough for them to catch prey.

There is a "mirror" on the back of the cat's retina, which is actually a film, that is, a tapetum. The tapetum will reflect the light passing through the rod cells in the opposite direction and then enter the rod cells, so the cat can see clearly in very weak light. When the cat's eye is illuminated in the dark, we will see the bright reflection of the cat's eye, which is the reason for the tapestry.

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Cats also have cones, so they can distinguish colors, but cats can only distinguish purple, blue, green and yellow. For red, orange and brown, cats see black to gray levels. The colors we can distinguish are mainly red, green and blue. What cats see is mainly gray, green and blue, and the color saturation is lower than that seen by humans, that is to say, the color that cats can see is not very bright, and blue and green seem to be the strongest colors that cats can feel.

(The following is the color of the same picture in human eyes and cat's eyes. )

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If you want the cat to see some pictures, such as watching TV for the cat, you can stick a retro film on the TV screen, which will turn some bright colors into purple, so the cat can see it. If it is a picture, you can use the filter of Meitu software to change the tone of the picture.