Fortune Telling Collection - Comprehensive fortune-telling - Why are leopard's eyes green at night?
Why are leopard's eyes green at night?
Leopards are similar to cats, and their eyes have night vision. For example, 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, the cat's eyes will glow. 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, 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 dim 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. In fact, you won't see their green eyes on an opaque night without a light source nearby. Only when you shine a flashlight into their eyes can you see their green eyes. In other words, you can only see them when they are in the dark, when you are in the light, or when you are behind the light source.
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