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When the environment is dark, the pupil enlarges to let in more light; when the environment is bright, the pupil becomes smaller to let in less light. The lens, which sits behind the iris, changes its shape to focus light onto the retina. Small muscles (ciliary muscles) contract to cause the lens to become thicker, which allows the lens to focus on nearby objects. In cats, these lens changes appear limited. The ciliary muscles relax to cause the lens to become thinner when it focuses on distant objects. The retina contains the cells that sense light (photoreceptors). The 2 main types of photoreceptors are cones and rods. Cone cells give cats excellent visual acuity and binocular vision, allowing them to judge speed and distance very well, an ability that helped them survive as hunters. However, although the cone cells are also responsible for color vision, it is uncertain whether cats can see colors. Cats also have many rod cells, which are good at collecting dim light. In fact, cats can see 6 times better in dim light than people, giving rise to the myth that cats can see in the dark.Square Enix (in Japanese). Archived from the original on July 29, 2016. Retrieved May 23, 2016. ^ "月刊 ビッグガンガン 2014年 vol. 11 2014年 11/23号 [雑誌]" [Monthly Big Gangan 2014 vol. 11 2014/11/23 edition [magazine]].
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