The pupil responds to light, which is essential for our vision and how we see our surroundings. Three known mechanisms change ...

But, there's another thing that cats are known for that you may not immediately think of when you picture your favorite feline: their slit-shaped pupils. Unlike humans, domesticated cats have slit ...

They also tend to have pupils that open more widely in low light ... (Both are named after their relative shapes.) Cones work in bright light and register detail, while rods work in low light ...

It is a crescent-shaped area of land in Western Asia and ... Their eyesight was key to their survival. The pupils of the sheep in this clip appear as dark, horizontal rectangles.

They conclude that pupil shape and size plays a key role in the grand scheme of evolution. And with all the advantages of goat eyes, you might even start to get jealous. Follow Tech Insider ...