Chapter 8 Cat vision

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Cats can see just as well as humans and in dim light they can see better.

Like humans, cats can see in 3D.  Their vision is adapted for detecting motion which is great for hunting and judging distances between object.

Cats appear to be nearsighted, focusing better on objects close to them (prey) rather than long distance.

Unlike the human round eye, the cat has an elliptical pupil which opens and closes quickly and also can open up larger than the human pupil which helps them during the night as more light can enter.

Cats also have a mirror like membrane on the back of their eyes called a Tapetum. It reflects the light passing through the rods... back through the rods a second time, this time in the opposite direction. 

The combination of elliptical pupils and the Tapetum permit cats to see extremely well in near darkness. 

Cats responded to the colours purple, blue, green and yellow range.
Red, orange and brown colours appear to fall outside cats colour range, and are most likely seen as dark to mid shades of gray.
Purple, blue & green appear to be the strongest colours perceived by cats.

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