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What part of the body fits the following description?
A thin, circular structure in the eye, responsible for controlling the diameter and size of its central opening and thus the amount of light reaching its light-sensitive inner layer.
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| iris |
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| retina |
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| pupil |
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| fovea |
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Eye color is defined by that of the iris. In optical terms, the pupil is the eye's aperture, while the iris is the diaphragm.
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