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Scientists believe that every person with blue eyes shares a common ancestor.This eye color first originated somewhere between 6-10 thousand years ago as a result of a genetic mutation.The mutated gene interferes with the body's ability to produce melanin in the iris of the eye.Melanin is a pigment that provides color to the eye, skin and hair.
The appearance of the eyes can vary from moment to moment. : Blue eyes can be found in many countries throughout the world, but are more common in Northern Europe and near the Baltic Sea in countries like Denmark, Sweden and Norway.In areas where blue eyes are predominant, 80% of the population or more may carry this eye color.Blue eyes can also be found in Western Asia and in the Jewish population in Israel.In the United States blue eyes are becoming increasingly rare.
A hundred years ago about 50% of those born had blue eyes.Seventy years ago about 30% of those born had this trait. This change is believed to have many factors including immigration patterns, genetics and increasing intermarriage rates.Interestingly if the melanin is removed from the eye, all eyes would appear blue in color.This is one reason why most babies are born with blue eyes.