5/15/2023 0 Comments Yellow irisThis means eye color is usually determined by age 1 year. Melanocytes, which are specialized cells that secrete melanin, are most active in the first year of life. However, once your eye color is set in childhood, your eyes can’t naturally change to a completely different color.īabies are the exception. It’s also possible for you to have brown eyes even if both of your parents have blue eyes.īecause reflected light determines eye color, blue, green, and hazel eyes can look slightly different under different lighting conditions. Blue eyes have the least amount of melanin and reflect the most light.īecause you inherit genes from your parents, your eyes will likely be similar in color to their eye colors. Hazel eyes have less melanin than brown eyes but more than green eyes. Light reflected from your eye comes from the blue part of the color spectrum.īrown eyes have a lot of melanin, so they absorb light, which makes them dark. When it doesn’t absorb light, the light is reflected, and the object is the color of the light it reflects. When an object absorbs light, it looks dark. According to an older 2010 study, your eye color is determined by up to 16 genes that control melanin production in your iris. We now know that it’s much more complicated than that. Since the gene for brown is dominant over blue, the belief was a blue-eyed person would have two genes for blue eyes, and two blue-eyed parents couldn’t have a brown-eyed child. Scientists used to think your eye color was determined by two eye color genes, one from each parent. Here are statistics for a few of those countries: The review used the broad categories of “brown,” “intermediate,” and “blue.” In Europe and Central AsiaĪ 2019 literature review on eye and hair colors included data on eye colors for countries across Europe and Central Asia. Other research has also concluded that most Asian people have brown eyes. Few East Asian participants had green eyes, while none had blue eyes. There was slightly more eye color variation among South Asian participants than East Asian participants. East Asian participants had grandparents with Chinese, Japanese, Korean, or Taiwanese ancestry. Participants were categorized as South Asian if all of their grandparents had Bangladeshi, Indian, Pakistani, or Sri Lankan ancestry. The 2015 study mentioned earlier found that almost all study participants representing South Asia and East Asia had brown eyes. Most people of African descent have brown eyes, according to a 2021 literature review. Here’s the breakdown of eye color prevalence in the United States: According to the AAO, the survey data can be used to determine eye color prevalence across the country at large.īrown is the most common eye color in the United States, just as it is globally. One 2014 survey asked over 2,000 people in the United States about their eye color. Just around 2% of people worldwide have green eyes. Over 50% of the world’s population has brown eyes, according to the AAO. “Brown” eyes can range from a light reddish-yellow to a dark brownish-black. The authors also stated that although brown eyes are dominant outside of Europe, there’s extensive variation within that brown color. Some have included gray, blue, brown, and black, while others have also used categories like pale yellow and deep yellow.Ī 2015 Canadian study on eye color in young adults noted that there has been little research on the genetic basis of eye color in people of non-European ancestry. To start, researchers have changed the color categories over time. It’s challenging to determine the number of people with a certain eye color. What are eye color percentages around the world?
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