This is how your brain judges depth. The target in focus should stay in the same spatial position as you switch between eyes. This is a simple test you can try on yourself. Pick a small target. Close one eye, then switch to the other eye. The target and your focus should stay centered and not jump. If the target shifts side to side or up and down when you switch eyes, your brain has to work harder to merge the images. That struggle affects depth perception and spatial awareness. You can have 20/