I’m told that blue-eyed people find coping with dazzling sun more difficult than brown-eyed people do. Why? Or if it’s untrue, what difference, if any, does eye colour make?
• The colour of our eyes is determined by the amount of melanin in the iris – the coloured structure visible through the transparent front of the eye. The function of the melanin is to make the iris opaque and prevent light entering it anywhere except through the pupil. The back surface of the iris contains the most melanin, although this pigment is also found just below its anterior surface and…
