Photo: Erik Mclean

Which country has most hazel eyes?

Hazel eyes: Hazel eyes are most common in North Africa, the Middle East, Brazil, and Spain.

worldpopulationreview.com - Eye Color Percentage by Country 2022 - World Population Review

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The iris is the colored part of the eye. This part surrounds the pupil -- the small black hole in the eye's middle that regulates the light. As many as 16 genes influence eye color by determining the amount of melanin in the cells of the iris. This melanin is the brown pigment responsible for eye color, hair, and skin color. Eye color is one of the first things people notice about one another. The majority of the world’s population has brown eyes, about 70-80%. Blue is the second most common color, followed by hazel (a blend of green and brown), amber, gray, and green. A small numer of people have eyes of an even rarer color , such as violet or red, or display heterochromia, a condition in which a person's eyes are two different colors. Non-brown eyes have no different color pigments. Instead, they have less melanin, absorb less light, scatter more light and reflect it along the spectrum of light color. An iris with little melanin appears blue, while those with more little melanin appear green or hazel. Eye color may not remain constant throughout your life. Many babies born with blue eyes experience a change in color as more pigment develops within the first three years.

Eye Color Percentage Around the World

Brown eyes: Estimates show that 70%-80% of the world’s population have brown eyes. In fact, the American Academy of Ophthalmology (AAO) claims that everyone on the planet had brown eyes around 10,000 years ago. About half of people living in the U.S. and a higher population in Africa, and Asia are brown-eyed.

Blue eyes:

Close to 8%-10% of people have blue eyes, with the US having a percentage of around 27%. Scientists believe that all blue-eyed people can be traced back to a common ancestor, who probably had a genetic mutation that reduced their melanin in the iris.

Hazel eyes:

About 5% of the world’s population and 18% of Americans have hazel eyes -- a mixture of green, gold, and orange. Hazel eyes are most common in North Africa, the Middle East, Brazil, and Spain.

Amber eyes:

Amber eyes have a little more melanin than hazel eyes, and still account for approximately 5% of the population. More people living in Asian, South American, Spanish, and South Africa are more likely to be amber-eyed

Gray eyes:

Close to 3% of people in the world have gray eyes. The gray-eyed have little or no melanin in their iris but have more collagen in the stroma part of the eye. The collagen is scatted by light to make the eyes look gray.

Green eyes:

Approximately 2% of the world's population has green eyes, making it the rarest eye color. Nevertheless, green eyes are common in a few parts of the world, like Ireland and Scotland. These people make up about 9% of the U.S. population.

Other Eye Colors:

Persons with albinism have very little or no melanin in the iris. The lack of pigment leads to red or violet eyes and often problems with their eyesight. A person may also have more than one eye color, a condition called Heretochromia, which affects less than 1% of people. The AAO states that those with central heterochromia have iris with two differently colored rings, while those with complete heterochromia have one iris with a different color.

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Do most siblings have the same eye color?

morgridge.org - Blue Sky Science: Why can eye color vary between siblings?

Eye color is determined by genetics and genes can vary between siblings. We all have genes in our body, and our genes carry DNA. Our DNA controls the way that we express different characteristics in our body, everything from hair color to eye color to skin color. It was thought that there were only a few genes that determined eye color. In more recent years, scientists have realized there are many different genes and factors that affect eye color. In fact, they’ve found up to a dozen or more genes that could play a role in determining eye color. Two genes that are most important are involved in the production of melanin. Melanin is a pigment, a type of pigment that has a very dark brown or black color. The amount of melanin expressed in the body, specifically in the eye, determines how dark our eyes are. It can vary from being very light blue to dark brown depending on how much melanin is in the eye. The specific part of the eye that determines color is called the iris. It’s colored ring that surrounds the pupil, which is the black center of the eye that you look through. Siblings can inherit various genes from their parents and they don’t always get the same ones. Depending on what genes they get and the way that these genes are turned on or off and expressed, can play a role in eye color. That’s how you’re able to get one sibling with light blue eyes versus another sibling that has dark brown-colored eyes.

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