Question

We've all heard that we have two eyes for depth perception, and if you only have one available, you have no depth perception. But this seems to be a false claim, one that can be trivially disproven by experimentation: close one eye and walk around for a bit with just the other eye open.You have no trouble perceiving the depth (distance from you) of objects around you, because the two major cues we use to perceive distance, namely parallax (the phenomenon of objects appearing to move across your field of vision more slowly when they're further away) and perspective (the phenomenon of objects appearing smaller the further away they are), are both perfectly valid with only a single eye. So what is it that's supposed to be missing, and why isn't it noticeable when walking around with one eye closed?

Answer 1

We can perceive depth with one eye using monocular cues such as parallax and perspective.

Step-by-step explanation:

Although we rely on binocular cues to experience depth in our 3-D world, we can also perceive depth in 2-D arrays. When we do this, we are relying on a number of monocular cues, or cues that require only one eye. These cues include parallax and perspective. Parallax is the phenomenon of objects appearing to move across your field of vision more slowly when they're further away. Perspective is the phenomenon of objects appearing smaller the further away they are. Both of these cues help us perceive depth with just one eye.