Summary of “This Is The Fascinating Way Blue Eyes Get Their Colour”

Your eyes aren’t blue because they contain pigmented cells.
Fascinatingly, it’s these two factors that control your eye colour.
Brown eyes, for example, contain a high concentration of melanin in their stroma, which absorbs most of the light entering the eye regardless of collagen deposits, giving them their dark colour.
Green eyes don’t have much melanin in them, but they also have no collagen deposits.
Blue eyes are potentially the most fascinating, as their colour is entirely structural.
People with blue eyes have a completely colourless stroma with no pigment at all, and it also contains no excess collagen deposits.
Interestingly, this means that blue eyes don’t actually have a set colour – it all depends on the amount of light available when you look at them.
Check out Van Slembrouck’s great story to find out how hazel and grey eyes get their colour, and also to check out his beautiful diagrams that explain structural colouring.

The orginal article.