Why is everything not just always in focus why do our eyes have to focus on certain things while making the forground and background unfocused?
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As a sidebar – hold your two thumbs together out at arms length. The area of your thumbnails is what is in focus at any one time. This is called the fovea. We “see” everything in focus because the eyes continually move and your brain stitches it all together. You brain stitches what your eyes hve seen.
If you have ever been doing something and put, say a small nail, down next to you without looking and then after a few minutes look for it. It may have “disappeared” because your brain has used its last image of that area.
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