All blue-eyed people have one thing in common – aside from having blue eyes.
Blue eyes have long captured human imagination, from being the subject of myths and legends to featuring prominently in literature and film.
While some see them as strikingly beautiful, others might be curious about whether this rare eye color carries any scientific secrets.
It turns out, the story behind blue eyes is more than skin-deep.
For example, people with blue eyes are more sensitive to light – if you have more melanin in the iris, you have more protection in the back of the eye from UV radiation and blue light damage.
Why blue eyes are more sensitive to light
People with darker eyes have more melanin, which means they are naturally better shielded from bright sunlight and the harmful effects of blue light emitted by screens.
Blue-eyed individuals, with less melanin, may squint more in daylight or require sunglasses to avoid discomfort, making photophobia surprisingly common among them.
While this may sound negative, there are many positives to this eyeshade.
Brains behind blue eyes
A study by Louisville University professor Joanna Rowe found that people with this eye color are more likely to be better strategic thinkers, as reported by the Daily Mail.
The professor clarifies: “It is just observed rather than explained. There’s no scientific answer yet.”
Many celebrities with blue eyes have bright minds, including Stephen Hawking, Alexander Fleming, and Marie Curie.
Beyond science, blue-eyed celebrities like Leonardo DiCaprio, Taylor Swift, and Chris Evans are often described as charismatic and strategic in their careers.
While their eye color isn’t the reason for their success, it is intriguing to see such prominent figures share the same iris shade.
All blue-eyed people have one thing in common
But most interestingly, all blue-eyed people have one particular thing in common.
One person writes: “I had no idea! Fascinating…”
Another jokes: “Spoiler alert: all their eyes are blue.”
But it turns out, it’s a lot more interesting than that (rather obvious) answer.
The genetics of blue eyes
Blue eyes are the second most popular eye color in the world, and the shade is believed to have originated around 6,000 to 10,000 years ago.
The widespread iris coloration apparently started due to a genetic mutation as, originally, all humans had brown eyes – in different shades.
A gene was recently identified that causes blue eyes, and it’s called HERC2.
This gene switches off OCA2, which results in different shades of brown eyes, and determines the amount of brown pigment melanin we make.
Professor Hans Eiberg, from the University of Copenhagen’s Department of Cellular and Molecular Medicine, explained: “Originally, we all had brown eyes. But a genetic mutation affecting the OCA2 gene in our chromosomes resulted in the creation of a ‘switch,’ which literally ‘turned off’ the ability to produce brown eyes.”
It is believed to have originally begun when humans first migrated from Africa to Europe, The Independent details.
All blue-eyed people share one ancestor
The University of Copenhagen study suggests that all blue-eyed people are descendants of one person.
Although it remains a mystery who first started this initial mutant gene, the fact every blue-eyed person has this mutation is pretty compelling evidence.
In the report, Professor Eiberg says that the research into the genetic mutation of people with blue eyes ‘simply shows that nature is constantly shuffling the human genome, creating a genetic cocktail of human chromosomes and trying out different changes as it does so.’
Throughout history, blue eyes have often been associated with mystery and allure.
In folklore, they were considered a sign of clarity, intelligence, or even supernatural powers.
Today, these associations remain, adding another layer of fascination to this genetic trait.
Whether it’s the link to strategic thinking, historical rarity, or cultural fascination, blue eyes continue to intrigue scientists, historians, and the public alike.
