Green is the least common eye colour… but it’s actually an illusion, as there i

Green is the least common eye colour… but it’s actually an illusion, as there is no green [or blue] pigment at all. The appearance is created by the way light scatters within the structure of the eye [an effect called Raleigh Scattering]. Only the amount of pigment varies - not the colour. Intrinsically, everyone’s eyes are differing shades of brown…

Except for albinos, of course, who have no pigmentation.

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“Green eye color is the rarest color found around the world, and it is estimated that only around 2% of the world’s population has green colored eyes. Green eye color is a result of a mild amount of pigmentation in the eye with a golden tint. When combined with the natural blue scattering of the eye, the colors mix to give a green appearance.”