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516 kilograms is about 75,000 times as heavy as an Eye (Human)
In other words, the weight of an Eye (Human) is 0.0000140 times that amount.
(adult)
A fully developed eye (in a person over the age of thirteen), weighs about 0.0071 kilograms. The pupil of the eye varies depending on the amount of light it is exposed to, but typically measures about 4 mm across.
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