The pupils in cats’ eyes are the same as those in general mammals. They shrink under strong light to prevent excessive light and heat from damaging the retina; they expand under dim light to collect and receive more light.
However, the shape of cat pupils varies depending on the species. The pupils of large wild cats are mostly oval, such as pumas, which are round, while the pupils of ordinary domestic cats are vertically slit-shaped; vertical slit-shaped pupils It can close more effectively and completely than round pupils. The main function of pupil closure is to protect the extremely sensitive retina.
The rod cells on the retina are mainly sensitive to changes in light intensity, while the cone cells are mainly responsible for analyzing images. Cats have more rod cells and fewer cone cells, so cats have better night vision than humans, but their vision is only one-tenth of humans, so they cannot recognize small things like humans.
Although the cat is severely short-sighted, its dynamic vision is very good. Even if the prey moves 50 meters away, the cat can catch it. Cats can detect prey moving 4 millimeters per second; therefore, fast-moving objects to humans appear to cats to be just moving normally.
Original article author：Shit Shovel Officer，If reprinted, please indicate the source.：https://www.petcatanddog.com/article/10294.html