CAS PS 222 Study Guide - Midterm Guide: Ames Room, Ciliary Muscle, Weighted Arithmetic Mean

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The fundamental goal of depth perception is to let us accurately perceive a 3d work on the basis of 2d retinal images, one in each eye. The representation of 3d space in the 2d retinal image is many-to-one: many different 3d scenes can produce one and the same retinal image. Objects of different shapes and sizes at different distances can produce the same retinal image because of the way the objects are oriented. Our visual system has evolved in a way that allows us to perceive the three dimensions of the real world. Depth perception is accomplished by using various proprieties of the retinal image as reliable cues to depth. Any given scene typically contains many cues in order to produce an unambiguous experience of depth. When you look at an objet that is anywhere from right in front of your eyes to about 2 meters away, you can feel your eyes adjust to focus on it.

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