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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. 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.
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