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One big difference between cats' eyes and our eyes is the number of rods and cones in the retina. Cats have a lot more rods than we do, which means they can see better in the dark than us, but they have fewer cones, giving them poorer color vision. Unlike dogs, cats aren't color blind, however it's thought that they don't perceive color as intensely as we do; they can see blues and yellows fairly well, but like some humans they can't distinguish between red and green. Their balance of rods and cones means they don't see the world in as much detail as we do, either; they're not very good at focusing on anything close, and their distance vision isn't too hot either. However the construction of their eyes means that they're exceptionally good at spotting anything small and squeaky within pouncing distance, making them incredibly effective predators. As well as the upper and lower eyelid, cats also have a third inner eyelid called the nictitating membrane, a protective translucent layer that you might occasionally glimpse when your cat blinks, and also if your cat's unwell as it may partially close over its eyes. And the reason that cats' eyes sometimes glow in the dark? A layer of tissue at the back of the eyes called the tapetum lucidum, which reflects light back. (Image credit: Getty Images)Why are cat eyes slits?The most striking features of cats' eyes are undoubtedly those vertical slits for pupils. They're not unique to cats – you'll also see them on lizards, snakes and crocodiles – and what these creatures all have in common is that they tend to hunt low to the ground. And it's believed that vertical slits as pupils deliver better depth perception and make it easier to focus on prey when you don't have a lot of height to work with. Interestingly big cats such as lions and tigers have round pupils; it's thought that they don't need the vision-enhancing properties of slits because their eyes are further from the ground.