Did you know that all humans had brown eyes up until between 6,000 and 10,000 years ago, when a genetic mutation occurred that reduced the production of brown pigment in the iris and blue eyes appeared? It is also interesting to note that some characteristics and preferences have been associated with eye color. For instance, studies have shown that blue-eyed boys of pre-school age display greater shyness than their counterparts with brown eyes. Another study revealed that men with brown eyes are perceived to be more dominant than blue-eyed men. However, this perceived tougher image may have more to do with the fact that brown-eyed men have broader chins, bigger noses, more closely spaced eyes, and larger eyebrows than blue-eyed men. Studies about the link between eye color and personality are inconclusive. Thanks to the variety of eyewear available, you have an opportunity to express your personality, accessorize, and even change your eye color. Try a new look in 2012. Researchers are currently at a loss to explain why eye color is so closely associated with facial type. One possibility is that the half-dozen or so genes that govern eye color have other effects on the body or are in close proximity to other genes that do.