10/30/2023 0 Comments Green eyeballsIn fact, nearly all eye colors are determined by how much brown-colored pigment called melanin is contained in cells in the iris. In addition to controlling the size of the pupil and therefore the amount of light that enters the eye, the iris contains pigmented cells that determine eye color.īut here's where it gets interesting: Though there are many different eye colors, there are surprisingly few types of eye pigments. The structure within the eye that is responsible for eye color is called the iris - the thin, circular structure that surrounds the pupil. This is because many different genes are involved in the inheritance of eye color, and different interactions and levels of expression of these genes can alter eye color outcomes in children. But it's nearly impossible to predict with 100% certainty the eye color of a child simply by knowing the color of his or her parents' eyes.Ĭlick to read the article and view the infographic Genetics play a role in determining eye color. In Iceland, a survey of the population revealed 89% of women and 87% of men have blue or green eye color. On the other hand, a multi-year survey of students at Iowa State University found the prevalence of green eyes to be 15.2%.Īlso, the prevalence of green eyes varies significantly by geographical region and country, with the greatest concentration in Northern and Central Europe.įor example, in Edinburgh, Scotland, it's estimated that 29% of residents have green eyes (57% have blue eyes and only 14% have brown eyes). Reliable statistics of the distribution of eye colors are difficult to find, but some sources put the worldwide prevalence of green eyes at only 2%. Part of the appeal of green eyes may be their rarity.
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