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And if you're only now thinking about how weird they are, we're here to answer all your questions. What's the deal with cats and their strange eyeballs? Why do they have those peculiar vertical slits for pupils? Can cats see in the dark and what do the shapes and colors mean? And why do cats always seem to have crusty blobs of gunk in the corners of their eyes?If such cat eye-related thoughts are keeping you awake at night, fear not. Here's where you can find out everything you need to know about your furpal's eyes: why they look like they do, how they work, what eye health problems you should watch out for and what your cat might be telling you with its eyes. Read on for all the illuminating details, and if you want to know even more about your cat's body, see our guide to cat teeth. Indoor vs outdoor cats: Do cats need to go outside? Best outdoor cat enclosure: Allow your cat to roam safelyWhat is special about cats' eyes?Cats' eyes are very different from human eyes. Obviously there's the issue of those pupils, but we'll come back to those in a minute. Structurally, cats' eyes, like ours, have pupils to lens light into the eyes, retinas at the back of the eye with two types of light receptors – rods for detecting light, and cones for detecting color – and an optic nerve to transmit all that light information to the brain. 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.
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