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The smallest particle visible to the naked eye is 40 microns. To give you some perspective, a piece of hair's width can range from 40 to 120 microns.
How much does a human eyeball weigh? According to some sources, the average human eyeball weighs approximately one ounce. Other sources quote a figure of only 7.5 to 8 grams (0.3 ounce). Based on a total volume oâ¦f 6.5 milliliters, the lower figure seems more accurate.