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Sight
Sight (also called eyesight or vision) is one of the senses. Having sight means to be able to see. Seeing gives animals knowledge of the world. Some simple animals can only tell light from dark, but with vertebrates, the visual system is able to form images.
The ability to interpret visible light information reaching the eyes is called visual perception. Sight is the resulting perception. The components that are necessary for vision are known as the visual system.
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