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When looking with the unaided eye, light from a single point object reaches all parts of the lens and is focused back onto a single point on the retina. Light from all points on the lens reaches all point on the retina. Point defects on the lens affect the quality of the entire image rather than specific parts of it. Occlusions on or near the lens are ...


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My intuition is that normally your eye collects light from a large area to form an image, so small-ish obstructions like cataracts get "blurred over" whereas when looking through a microscope the image is coming from a very small area and the light acts as the bulb in a projector, with your cataracts as the projected "slides" and your retinas the "screen."


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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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