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Cats' glow-in-the-dark eyes have caused them great harm for centuries. For centuries, black cats have been considered the companions of witches, and the belief that cats' eyes shine by themselves has survived to this day. However, in reality, everything is different. If you put the cat in a room without a window, then its eyes will not shine in complete darkness.
The shine of cat's eyes is explained simply: they reflect light only from an external source. The secret of the "glow" lies in a thin reflective layer consisting of transparent cells. When the light beam reaches the light-sensitive retina through the cornea and lens, it is not completely absorbed.
Part of the light reaches the inner choroid. In animals with glowing eyes, this light is reflected back by the transparent cells, enters the retina, increases the photosensitivity of the eye, and spreads out in a narrow beam, which actually allows the animal to see much better at night. .
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