Brown Eyes - 70 to 80% 70 to 80% of the world’s population have brown eyes.Ī whopping 70 to 80% of the world’s population have brown or darkly pigmented irises, making brown the most common eye color worldwide. In addition, OCA2 and HERC2 are the two major genes associated with the variation in eye colors. As of 2010, researchers believe that as many as 16 different genes influence eye color in humans, and most of these genes play a crucial role in the production, transportation, and storage of melanin pigment. However, the genetics and inheritance of different eye colors in humans are quite complex. Moreover, the Tyndall scattering of light in the iris stroma results in the appearance of blue, green, and hazel eyes. Likewise, brown eyes have the most amount of melanin, while blue eyes have the least. The more melanin concentration one has, the darker one’s eyes will be. In humans, this pigmentation of the iris depends on the melanin concentration in the iris pigment epithelium, it's content within the iris stroma, as well as the cellular density of the stroma. Two factors affect the color of one’s eyes: the pigmentation of the eye’s iris and the frequency of light scattering by the murky medium in the iris stroma. How Is Eye Color Determined? As many as 16 different genes influence eye color in humans. Eye color not only affects one’s personality but also reflects one’s ancestry, the melanin concentration in irises, and even one’s current health condition. It is, therefore, interesting to note how eye colors vary worldwide and the different percentages of people in the world that have brown, blue, hazel, amber, green, and gray eyes. The color of one’s eye is perhaps one of the first things people observe when they see each other. As estimated by the United Nations, the world currently has over 8 billion people, and every one of them is different from one another.
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