3 The eye and perception
The human eye is often likened to a camera. It does have broad similarities, but the parallel can be very misleading. As in the camera, the amount of light admitted to the eye is controlled by an iris. The image of the scene is focused by a lens onto a light-sensitive surface. But there the similarity ends, for eye and brain are, in fact, remarkably deceptive.
The eye and the camera
The eye itself has various optical shortcomings that we could not tolerate in a camera, and yet, thanks to instinctive readjustments and the brain’s ability to interpret, we are left with an impression of perfect vision and overall clarity. Apart from a few puzzling optical illusions, we accept what we see as a natural and accurate representation ...
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