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First off your premise makes no sense. There's no reason to believe that something that exists in 3 dimensions necessarily needs to perceive in 3 dimensions (although one would certainly expect that to offer an evolutionary advantage). So in that sense your question doesn't make sense. However, I'll attempt to answer the question of why is it that we sort ...


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It's because our eyes have a 2D array of photo-sensitive receptors. Using two eyes you can 'detect' the third (depth) component. If you consider each eye to be a single point (for simplicity), the distance between the eyes themselves is a given 'constant'. A distant object in your vision, seen by both eyes, will be in a different position for each eye. You ...


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If you combine the two statements In the paraxial approximation for a monochromatic light field, the complex light field in the back focal plane of a lens is the Fourier transform of the complex light field in its front focal plane. The lens in the human eye is a lens that can accomodate its focal length so that the retina lies in the focal plane of the ...



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