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A surprise at birth? -

Many babies start out with lighter eye colors that can change after a while, as you'll see explained later, but it could also be in their genes...

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A brief explanation -

Even if you have brown eyes, you could be carrying a recessive gene like blue or green eyes behind it. In Drake's case, his mother's light-eye gene may have just been waiting for the right match to appear, along with her blonde-hair gene. 

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Brad Pitt - Many celebrities seem to have these beautiful light eyes, which actually gives a false impression of how common the trait is.

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It's in the eyes - Jennifer Aniston also shares this trait, which, even though regarded as beautiful, is actually a genetic mutation.

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Unusual - People with green or blue eyes actually comprise a fairly small percentage of the world's population.

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Statistics - It is estimated that only around 2% of the world population has green eyes.

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Locations - Most of the population with light-colored eyes have European roots.

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Countries - The UK and Ireland are examples of where most of green-eyed people are concentrated.

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Question - But why are some people born with blue or green eyes?

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Genetics - Chromosomes 1, 15, and 19 are responsible for transmitting the mother and father's genes to the baby.

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Genetics - If there is a brown-eye gene in that mix, the baby will be born with brown eyes because that is the dominant gene—this is what happens to most of the population in the world.

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Genetics - But if both genes that are passed on to the baby are recessive, then it will be born with blue or green eyes.

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Melanin - The amount of melanin is what defines the eyes' exact color.

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Blue eyes - The blue represents a total absence of melanin.

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Green eyes - As for green eyes, a certain amount of melanin can be found.

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Function -

Melanin has a very important function: to protect eyes from sunlight.

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Sensitivity - That's why light-colored eyes are more sensitive to solar rays.

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Double care -

People with green or blue eyes need to be doubly careful when it comes to preventing certain eye problems such as cataracts.

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Research - In 2008, a study revealed surprising information about blue eyes.

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Theory - Danish researcher Hans Eiberg said that everyone who has blue eyes is somehow related.

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Explanation - According to the research, blue eyes appeared around 7,000 years ago thanks to a genetic mutation.

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Location - According to the study, which happened near the Dead Sea region, the mutation has since then been passed on through generations.

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New studies - But according to a 2017 CNN article, all human eyes are brown!

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New theory - According to the study, some people just appear to have light-colored eyes because of their low melanin content.

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Phenomenon - Have you noticed what happens to babies sometimes?

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Mutation - Some babies are born with blue eyes but the color ends up changing to brown with time.

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Explanation -

The explanation for this phenomenon may be contained in a study published by Live Science in 2011.

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Main cause - According to researchers, the child's development includes a rise in melanin levels, which ends up changing their eye color.

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Keep an eye out! -

You'll never look at someone with blue or green eyes the same way!

See also: What do your eyes say? Celebrities with different-colored eyes.

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