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

Because of focus. One eye still needs and can focus in and out, but it’s not fast enough for most eye-hand coordinaton activities. Hold a finger near your face, with one eye closed alternate looking at your finger and to whatever is behind it. It’s kind of hard, but you know what’s is far and near.
Basically one eye has depth-perception but doesn’t have the ability to “measure” it, you need two to be able to “triangulate” the focal point and focus fast on the object.