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31,000,000 grains is about 300,000 times as heavy as an Eye (Human)
In other words, it's 280,000 times the weight of an Eye (Human), and the weight of an Eye (Human) is 0.00000360 times that amount.
(adult)
A fully developed eye (in a person over the age of thirteen), weighs about 110 grains. 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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