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The human eye is an organ which reacts to light for several purposes. As a conscious sense organ, the mammalian eye allows vision.In common with the eyes of other mammals, the human eye's non-image-forming photosensitive ganglion cells in the retina receive the light signals which affect adjustment of the size of the pupil, regulation and suppression of the hormone melatonin and entrainment of the body clock.
What is the diameter of human eye?
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