Interestingly enough, dark brown eyes are most common in Southeast Asia, East Asia and Africa. Light brown shades are most often seen in West Asia, Europe and the Americas.
In fact, the American Academy of Ophthalmology (AAO) state that everyone on Earth had brown eyes around 10,000 years ago. Nowadays, the AAO note that about half of those living in the United States, and a higher proportion of people in Africa and Asia, have brown eyes.
To date, eight genes have been identified which impact eye color. The OCA2 gene, located on chromosome 15, appears to play a major role in controlling the brown/blue color spectrum. OCA2 produces a protein called P-protein that is involved in the formation and processing of melanin.
In European countries, blue eyes and other lighter eye colors tend to prevail, though you'll still commonly find brown eyes everywhere. Brown eyes in an otherwise mostly light-eyed region may point to a genetic leftover and a time in history during which everyone in the world had brown eyes.
While blue eyes used to be the least common colour and were seen as a rarity, 48% of the British population now have blue eyes. This is followed by green eyes at 30%, with a mere 22% of the British population having brown eyes.
When broken down by gender, men ranked gray, blue, and green eyes as the most attractive, while women said they were most attracted to green, hazel, and gray eyes. Despite brown eyes ranking at the bottom of our perceived attraction scale, approximately 79% of the world's population sports melanin-rich brown eyes.
Brown eyes are more resistant to problems because they have more melanin. It also helps to repair DNA damage and to keep the eyes moist. People with brown eyes are also less likely to develop certain types of eye diseases, such as age-related macular degeneration.
This is because excess melanin (which causes the brown colors of the iris) protects the eyes from sunlight. Since warmer climates tend to have more sunlight, this means that brown eyes are more common in cultures near the equator. On the other hand, blue, green, and hazel eyes happen when the iris has less melanin.
Put these together and it's really unlikely that a trait would appear to skip a generation because of a new genetic change in a child. So most of the time, dominant traits like dark hair and dark eyes don't skip a generation.
The bey2 gene has one allele for brown eyes and one for blue eyes. The allele for brown eyes is the most dominant allele and is always dominant over the other two alleles and the allele for green eyes is always dominant over the allele for blue eyes, which is always recessive.
Kleisner and his colleagues asked more than 200 students to rate how much they could trust a series of 80 male and female faces with either brown or blue eyes. Subjects rated the brown-eyed faces as being more trustworthy, but that wasn't the end of the story.
If you have brown eyes, you'll be happy to know they have been associated with some health benefits. People with brown eyes may be less vulnerable to certain diseases. For example, people with brown eyes appear less likely to develop age-related macular degeneration than people with light-colored eyes.
Brown hair, mostly medium to light brown shades, are also dominant in Australia, Canada, South Africa among White South Africans and the United States among European Americans from the Northern, Central and Eastern European (British, Scandinavian, Baltic, Dutch/Flemish, German (including Swiss-German and Austrian), ...
Many babies are born with blue or brown eyes. But newborns can have any eye color. As a baby grows, melanin continues to develop. If a blue-eyed newborn develops more melanin in their irises, their eyes might darken or turn brown or hazel.
Those with darker colored eyes experience less visual discomfort in bright, sunny conditions. Also, darker irises reflect less light within the eye, reducing susceptibility to glare and improving contrast discernment—so people with darker eyes may have better vision in high-glare situations, such as driving at night.
Other rare eye colours include grey eyes which sometimes have streaks of gold, amber and brown, red/pink eyes which can sometimes appear violet and heterochromia. Amber eyes are also incredibly rare and are a yellowish brown colour.
According to the study, "We concluded that although the brown-eyed faces were perceived as more trustworthy than the blue-eyed ones, it was not brown eye color per se that caused the stronger perception of trustworthiness but rather the facial features associated with brown eyes."
Ultimately, from these studies you can conclude that there is no significant difference between the eye's ability to see or affect reaction time. The only conclusive difference between blue eyes and brown eyes is that blue eyes are more sensitive to light since their isn't much pigment to absorb the light rays.
Brown eyes are the most common: Over half the people in the world have them, according to the AAO. In fact, about 10,000 years ago, all humans had brown eyes.
Sweden. The stunning Scandinavian nation of Sweden is known for surreal forests, coastal islands, glittering lakes and glacial mountains. It is also known for being home to the most beautiful women in the world. With complete elegance, sporty charm and passionately deep eyes, women of Sweden are perfect beauties.
Brown eyes, on the other hand, are the most common eye color, yet respondents to the study found them to be the least attractive. The possibility of altering the color of one's eyes from brown to hazel with the use of safe laser eye color alteration surgery is no longer a pipe dream.