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There's good evidence that human color vision shows enormous individual physical variability in certain aspects. The ratio of long- to medium-wavelength cone cells as measured in one study varied by over an order of magnitude across color-normal males. A non-trivial lucky fraction of women are believed to be tetrachromatic like birds and reptiles. Some aphakic people (with missing or damaged lenses) who can see UV light have reported that it appears to be bluish-white.