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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. Another advantage of slits is that they make it a lot easier – and quicker – to switch between a constricted and dilated state, and the change in size is much larger than in human eyes. What this means is that cats can adapt much better to different lighting; at night they'll open their pupils wide to let all the light in, while during the day they'll narrow them down to razor-thin slits. And because of this, cats can hunt at all hours, giving them a huge predatory advantage. (Image credit: Getty Images)Can cats see in the dark?While, yes, cats can indeed see in the dark, there's a little more to it than that. While cats can't actually see in total darkness, they can see very well in extremely low light. As we've mentioned they have a lot more light-gathering rods in their retinas than we do, so in what we may perceive as total darkness, they can still see perfectly well. On top of that they have another visual advantage that makes it easier for them to see in the dark. The tapetum lucidum we mentioned earlier, that makes their eyes appear to glow in the dark? Its actual function is to bounce light back within the eye, effectively enhancing their night vision. What cat eye colors are there?Most cat eye colors can be found on a spectrum between green and copper, with yellow in the middle, but as with most feline-related things it's just a little more complex than that.
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