A cat’s eyes appear to glow in the dark. The cat’s eyes themselves do not emit light, but the retina behind the cat’s eyeballs has a structure similar to a reflector, which can reflect the collected light, so the darkness The cat's eyes appear to be glowing.

The role of cat pupils:

The pupils of cat eyes are particularly large, and they can change the shape and size of the pupils under different intensities of light. Under the stimulation of bright strong light, the pupil shrinks as thin as a line. In darkness and places, the pupil dilates as round and big as a light bulb. The pupils of a cat's eyes adjust very quickly and can change just by turning their head.

Because the pupil of a cat’s eye can become extremely large and can collect very weak light into the pupil, it can see things clearly in a very dark environment. In addition, there is a thin film deep in the pupil of a cat's eye, which reflects the collected light. Cat's eyes appear particularly bright in the dark because the film reflects light.

Characteristics of cat eyes:

A cat’s two eyes are completely located in the front of the head, so that the two eyes have a common field of view and each eye has separate views. The field of view, the field of view or angle of view of each eye is more than 200 degrees. With such a large field of view and the function of natural night vision, dark places become a place for cats to show off their talents. Therefore, people call cats “the masters of the night”, or night owls for short. Research shows that cats’ night vision is 6 times that of humans, and that of dogs is 5 times that of humans. Although it is much stronger than humans, it does not mean that cats can see things in complete darkness without a trace of light. They still have to rely on sounds and smells. and a keen beard to aid navigation.