What makes blue eyes blue?

Blue eyes are blue for the same reason the sky is blue - scattered light. Advertisement Irises are made up of three layers, a thin top and back layer, with a spongy layer in between called the stroma. read more

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. read more

Mendelian genetics are taught using the gene for brown eyes as a dominant and blue as recessive. Other colors are usually waived away. In fact there are multiple genes that determine eye color, although blue eyes are thought to be traceable to a single ancestor. read more