The human eye is both beautiful, fascinating and unique. Much similar to a fingerprint, each individual’s eye color is specific only to themselves, with no others sharing the same shape, color and appearance. Eye ball colors depend on the amount of pigment found in the iris and its distribution. Light gray-blue eyes contain much less pigment than extremely dark brown eyes and therefore, there are many shades of eye color in between.
Black eyes form when there is a large concentration of melanin with in the iris. People who have true proper black eyes are very rare. As it is believed that people with very dark brown eyes are considered to have black eyes. In addition to it studies point that the darker one’s eyes it the more melanin is there in the system.
Brown eyes are in the majority—an estimated 70 to 90 percent of the world’s population have brown eyes. People with brown eyes have the most of melanin within the irises, meaning their eyes are naturally more protected from the sun. Brown eyed people may be less vulnerable to certain diseases. For instance, people with brown eyes appear less likely to develop age-related macular degeneration than people with light-colored eyes.
Hazel-eyed people are second in line for the most melanin, but their pigment is concentrated around the edges of the iris, and flickering flecks of gold, brown or green fill the centre. These eyes are less common than brown eyes.
Only 8 percent of the world have blue eyes. Research shows that blue-eyed folks share a single and common ancestor. Scientists tracked a genetic mutation that took place thousands of years ago (think Ice Age) which is the cause of all blue-eyed people around today. Not only are these eyes swoon-worthy, but they also have better night vision.
Green eyes have low to moderate amounts of melanin and they are super rare. Only an estimated 2 percent of the population have them. According to a research, it is interesting to know that green eyes have been traced around since the bronze age.
Only about 3 percent of the world’s population is thought to have this rare eye color. Not much is known about gray eyes, but it’s suspected that gray-eyed people have an even smaller amount of melanin in their eyes than blue-eyed people, and they have a different composition of the stroma that causes the light to scatter differently to produce the mysterious silvery hue.
Also known as the cat-eye shade. This shimmering eye color is more common in felines, but humans also possess the ultra-rare yellowish, golden, or copper-colored eyes. Unlike hazel eyes, amber eyes are a solid color and do not contain brown, green, or orange flecks. It is likely to be seen in individuals of Spanish, Asian, South American or South African descent.