Why do an disappear when one eye is closed?

Answer 1

When one eye is closed, the brain relies on visual input from the open eye to construct a cohesive image of the world. This can lead to the phenomenon known as "monocular vision," where depth perception and some visual details may be lost, causing certain objects or parts of the visual field to seem to disappear or become less distinct. Additionally, the brain may filter out redundant information from the closed eye, contributing to the perception of "disappearance." This effect highlights how our visual system integrates information from both eyes for a complete perception of our surroundings.