If depth perception works because the brain checks the difference in the position of the object between the two eyes and concludes how far away it is, how can we still see depth when one eye is closed?

Question

If depth perception works because the brain checks the difference in the position of the object between the two eyes and concludes how far away it is, how can we still see depth when one eye is closed?

In: 3602

Answer 1

You think you can see depth, but in reality it’s your brain giving you a best estimate based on knowledge of sizes, shadows, movement, sound, but in to see true depth with one eye is simply impossible. To proof this you can ask someone to hold a finger in front of you, somewhere between your eyes and almost your maximum reaching length of your arm (this will be somewhere around 0 to 60cm, 0 to 2 feet). Now to touch this finger from the side is easy with two eyes. Touching it with one eye? You’ll miss most of the time.