What color can a dog's eyes distinguish?

The dog's eyes can distinguish blue from yellow, black from white.

It's not true that the dog's world is only black and white. This statement is a misunderstanding due to the limitation of early photography technology and the lack of silver salt film photography technology.

The real world is colorful, but it mainly depends on who sees the world. Dogs' eyes can not only distinguish black and white, but also distinguish colors, but they are different from the way we humans distinguish colors. For example, dogs can tell blue from yellow, but they can't tell red from orange. They think the latter two are the same, they are all yellow.

The reason for the difference is that we perceive colors differently from dogs, which mainly depends on cone cells, which are used by various organisms to receive light stimulation. Cone cells are visual cells located in the retina. Because it can accept light stimulation and convert light energy into nerve impulses, it is also called photoreceptor.

Its outer segment is conical, so it is called cone cell. One cone cell is sensitive to red light, another is sensitive to green light, and another is sensitive to blue light. In short, the dog's vision is composed of two kinds of color receptors, unlike ours, which are composed of three kinds.

In this way, dogs' eyes can't perceive colors such as green or red, but human eyes can. Humans have three kinds of color receptors, which are the same as multi-receiver color TVs.

Reasons for dogs' good night vision:

The eye structure of dogs is different from that of humans. The dog's retina has a layer of choroid, which is very reflective and can improve the dog's night vision. It can provide dogs with so-called second vision. Because of the existence of this film, the night vision ability of dogs is more than five times higher than that of humans, and it has become a secret weapon for dogs to survive.

Foods beneficial to dogs' eyes include protein, vitamins, vitamin B 1, vitamin B2, vitamin C, etc. You can also eat some fresh fruits and vegetables properly, which can provide dogs with the nutrients they need, such as rich vitamins, especially vitamin A.

Some fruits, vegetables and meat like apples and pears contain the above elements, which can play a certain role in dogs' eyes.