Blue eyes are the result of a genetic mutation that causes less melanin because it causes more light to reflect out of the eye, forming blue eyes. 8%-10% of the world's population has blue eyes. Most of them are in Europe. There are theories that the melanin in brown eyes helps prevent strong sun exposure, but for areas with little light all year round, such as Europe, the North and South Poles, dark eyes are not necessary, which is why the proportion of blue eyes in Europe is much higher than that of other continents.
It is estimated that 89% of Estonians have blue eyes. This small European country is also the birthplace of many people with charming blue eyes and fair complexions. However, some studies suggest that Estonians may have a more blue-gray color in eye color.
Finland is a country with a long history and unique culture, and like Estonia, Finland has a whopping 89% of the blue-eyed population.
There are pros and cons to everything. Although having a pair of beautiful blue eyes can add a lot of charm. But one study showed that people with lighter irises had more exposure to sunlight damage. Therefore, blue-eyed people wear sunglasses and anti-blue light glasses are very necessary.
In addition, human eye color is not static, and most newborn babies have light eyes. As the child grows, melanocytes slowly begin to produce melanin. Since melanocytes constantly produce pigment, the color of the eyes can theoretically be changed. Adult eye color usually develops at 3 to 6 months of age, but it can be later.
Changes in eye color (brightening or darkening) during early childhood, adolescence, pregnancy, and sometimes after severe trauma such as heterochromia indicate that the eyes sometimes change color in some cases due to chemical reactions or hormonal changes in the body.