eli5 why distance objects appear smaller, and why not only blurrier while size is the same for the naked eye.
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Grab a sheet of paper. Draw a line. Thats your retina. Now drawn a point somewhere in front of it. Thats the hole the light enters your eye. Now draw an object in different distances like 2 points connected with a line. Then draw a line from the points of the object through the point in front of your retina and mark where the line intersects the retina. Drawing the object at different distances will make it appear smaller or larger on the retina. Go see for yourself. In a nutshell this is how our eyes work.
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