Humans have two eyes to see the world in 3D and judge distances accurately.

Having two eyes on the front of the face creates a process called stereopsis. This term was first used by Sir Charles Wheatstone in 1838. Because your eyes are separated by a small distance, each retina captures a unique view of your surroundings.The brain receives two different signals at the same time. The visual cortex calculates the tiny differences between these two images to determine depth. This system works best for objects up to about 6 meters away.Two eyes also give you a wider view of the world. One eye can see about 150 degrees wide. Using both eyes increases your field of vision to about 190 degrees.The area where the views from both eyes overlap is about 120 degrees wide. This overlap is necessary for hand-eye coordination. It helps you perform tasks like catching a ball or pouring water into a glass.Having two eyes also helps you see better in dim light. This is called binocular summation. It makes it easier to spot faint objects or small movements that one eye might miss.