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If you had two objects with words on them, one very large font and one very small font.

The large font object is further away from you than the small font object, but you could see the detail on them equally the same as they appear identical in size to you due to the scale of the objects.

How then does the brain know the difference? How do the eyes know a difference?

They say to look at distant objects to rest your eyes from the computer, but couldn't you just look at smaller font and trick the brain into thinking its looking at a large object far away?

Since we don't consciously control this aspect, how does the brain figure it out?

WDUK
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    It's because you have 2 eyes; same principle that makes 3d movies work even though objects are projected on to a screen the same distance from you, they appear to be different distances. – Arnon Weinberg Sep 18 '21 at 05:55
  • @ArnonWeinberg but wouldn't that only work if there is movement ? – WDUK Sep 18 '21 at 06:26
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    Does not require movement, no. You are thinking of parallax, different thing, doesn't require 2 eyes. – Arnon Weinberg Sep 18 '21 at 06:48
  • Hmm i see, i was trying to find optical illusions based on shadows to trick the eyes on what was 3D or 2D which led me to wonder then if we could trick the brain on how far something was with optical illusions and see how the eyes would respond. – WDUK Sep 18 '21 at 06:58
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    The brain can definitely be tricked, which is how optical illusions work. Depth perception, parallax, shadows, prior knowledge/expectations and focus are all thing which lead things to be perceived one way or another. – Steven Jeuris Sep 18 '21 at 14:37

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