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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.
Human eyes have a visual threshold that can only detect light to a depth of around 500-600 metres. The colossal squid not only has large eyes and lenses â its are also large, around 80-90 mm across. A large pupil allows the eye to collect every last photon of light in the incredibly deep and dark waters where it lives.