Monthly Archives: May 2016

Melanin determines the eye color

Variations in the human’s eye color, which has an incredibly wide range amongst animals, is essentially due to the nature and the quantity of melanin contained in the iris. Thanks to this anti-UV, this circular membrane can play the same role as a camera’s diaphragm: by contracting more or less, the iris changes the diameter of its central opening, the pupil, and regulates the light flow hitting the retina. Different nuances of the iris, from blue to brown, grey to purple, are due to the melanin concentration in its two forms which is produced by cells called melanocytes. Read more…