When I take pictures of cats, their pupils always reflect light. Why?

The eyeball structure of cats and canines is quite special. When the light passes through the retina and reaches the iris at the back of the eyeball, it is reflected to the retina again for imaging, which is why cats and dogs can hunt with the help of weak light at night. The light reflected by the iris will still pass through the retina, which is why the eyes of cats and dogs will glow in weak light.

Cats have special eyes. When the light is stronger, its eyes will line up. When the light is dark, its pupils will be enlarged; In the dark, cats' eyes will glow, and whenever these eyes glow, it will always make people feel scared.

In fact, the cat's eyes themselves are not luminous, but there is a substance similar to a reflector on the retina behind its eyeball, which can reflect the collected light energy. So we see that the cat's eyes are bright at night. This pupil of a cat is very elastic and has strong contractility. Therefore, the cat's vision is very keen, which should be six times that of human beings. This keen vision and broad perspective make it see things in a much larger range than people. Then this strong vision, then it also constitutes a necessary condition for its survival.

This should start with the role of the pupil, which is located in front of the lens and controls the intensity of light entering the lens, and changes with the intensity of external light. At night, the cat's pupil becomes larger, trying to receive more light, but because the lens and ciliary body converge, it is a convex lens, and the light is concentrated in a small range. It is precisely because the pupil is enlarged that the photosensitive cells at night are columnar cells, and their sensitivity is enhanced, so they are bright!

There are many special crystal points at the bottom of the wolf's eyes. These crystals have strong reflective ability, which can gather the weak scattered light around them into a beam and reflect it centrally, as if the wolf's eyes are shining.

This is a common physiological phenomenon in wild animals. Many animals have many special crystal dots at the bottom of their eyes. These crystal dots have strong reflective ability, which can gather the weak scattered light around them into a beam and reflect it centrally. Animals wearing these glasses are generally very active at night. They can distinguish objects by weak light. From the outside, it seems that their eyes are shining. Most people who wear these glasses are Nocturnal Animals, including wolves, cats, tigers, leopards and owls.