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Define the term compound eyes

Define the term compound eyes?

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Arthropods contain compound eyes made up of several visual units termed as ommatidia. Each and every ommatidium transmits visual information via the optic nerve to the brain that interprets the image. Since they are round and numerous, such ommatidia, whose external surfaces point in various directions making independent images, cause arthropod eyes encompass a big visual field, bigger than the visual field of vertebrates. Various insects contain one or more simple eye besides their pair of the compound eyes.

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