Sense of Sight
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In animals there are different types of sight. Some have what we call simple eyes. The simplest eyes are not capable of forming an image or picture of external objects. They only make the animal able to distinguish between light and darkness or shadow. This diagram shows the simple eye or a jellyfish.
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JellyfishSource
Winchell, Alexander Sketches of Creation (New York, NY: Harper & Brothers, 1870)
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