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https://en.wikipedia.org/wiki/Color_blindness#Red.E2.80.93green_color_blindness

Protanopia (1% of males): Lacking the long-wavelength sensitive retinal cones,

 

Deuteranopia (1% of males): Lacking the medium-wavelength cones,

 

Do they lack all those cones, or are they just (severely) short?

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