Have you ever thought about what links all blue-eyed people, apart from their beautiful eyes? As it turns out, the unique combination of genes found in these eyes can end up creating amazing abilities. While the majority have brown eyes, blue eyes have impressed us for ages with their unusual, almost otherworldly charm. Still, the real explanation makes this trait even more intriguing than its color.
It is believed by scientists that every current owner of blue eyes shares the same ancestor, who lived in Europe thousands of years ago. According to studies, all blue-eyed people have a particular mutation in the OCA2 gene which controls melanin production in the eyes.
Essentially, a mutation happened that turned down the gene’s task of making large amounts of melanin in the iris which affects the blue appearance seen in humans. Before the genetic change, most people likely all had brown eyes.
This fact makes it even more fascinating, because the mutation affects eye color and a few extra characteristics. Blue-eyed people tend to be more sensitive to bright light. Their irises do not have enough melanin to screen out dangerous UV rays from the sun. This can make it harder for them to adjust to bright places and boost their chances of developing problems such as macular degeneration as they age.
Even so, there are upsides as well. Some studies believe that people with blue eyes may have some unique thinking and health features. In one case, studies have shown that people with lighter eyes may do better in activities that depend on strategy or are completed at their own pace.
Some researchers have discussed the idea that blue-eyed people may be able to handle pain better and have different sleeping habits than others, but evidence in these subjects is unclear.
Throughout history, blue eyes have usually been linked to beauty, mystery and a sense of the mystical. Blue-eyed people often appear as mysterious or independent in literature, movies and traditional stories. It’s likely this attitude comes from their uncommonness and the way they catch light which gives them a shining look under some circumstances.
You could say that blue eyes are a unique example of how one gene can make differences in many people across generations. From one ancestor long ago, millions now display this characteristic which is important in their past and still of great interest to scientists.
