Why we have two eyes?

Having two eyes provides us with binocular vision, which is crucial for depth perception. Each eye sees a slightly different image because they are spaced apart on our face. Our brain then merges these two 2D images into a single 3D picture, allowing us to accurately judge distances. This was a vital evolutionary advantage for our ancestors for tasks like hunting, climbing trees, and avoiding predators. Try closing one eye and trying to pour water into a glass—you'll notice it's trickier because your depth perception is reduced. Two eyes also give us a wider field of view for detecting potential dangers from the sides.

It's all about survival and efficiency! Beyond depth perception, having two eyes provides a built-in backup system. If one eye gets injured, you still have another one to see with, which greatly increases your chances of survival. Furthermore, the overlap in the fields of view from both eyes improves our ability to see in low-light conditions and enhances visual acuity, meaning we can see details more clearly. The slight difference between the images from each eye also helps our brain filter out visual "noise" and focus on what's important. It's a fantastic example of evolutionary design.