How can our eyes tell the difference between a close object and a far object
In: Biology
Two ways. One is just the size of what we see compared to how big we know that object to be. The second is based on the angle of your eyes. Use your left and right hands to point at your computer screen. Now instead point at something very far away. See how the angle between your fingers changes as you point to things further away? Your brain can tell how far something is by how it has to aim your eyes in order to focus on it.
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