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The latter, if caused by the chlamydia bacteria, can be contagious to humans. Since cats' eyes are so important to their general welfare, it is crucial that you take your cat to a veterinarian at the first sign of trouble. Many conditions can be treated easily if caught in time but can lead to months of veterinary expense and possibly even blindness, if ignored. Cats' Night Vision Cats' nocturnal vision is far superior to that of humans. While they can't see in total darkness, they can see with only one-sixth of the illumination we need to see. In the feline, the muscles of the iris surrounding the pupils are constructed in a way that allows the eye to narrow to a vertical slit in bright light and to open fully in very dim light to allow maximum illumination. In addition, a reflective layer behind the cat's retina, called the tapetum lucidum, reflects incoming light and bounces it back off the cones, making more use of the existing light. The tapetum is probably responsible for the shiny green orbs you see when a small amount of light hits a cat's eyes at night. These special feline features have probably developed for survival purposes, as wild cats are nocturnal and do much of their hunting at night. The Spruce / Melissa Ling Testing Cats' Eyes to Help Humans In 2000, a team of scientists at the University of California in Berkeley used cats to learn more about human vision. During the controversial experiment, the team, led by Yang Dan, assistant professor of molecular and cell biology, anesthetized the cats and then implanted electrodes into their brains and showed them images.