Blue eyes are mostly common throughout northern and Eastern Europe, especially in Sweden, Iceland, Norway, Denmark, Germany, Russia and Poland (blue or green eyes are charactered for slavonic ethnic groups). One survey estimated that nearly 90% of Icelanders have blue or green eyes,[41] while another reported 50-80%, in contrast to 20%-49% of Spaniards and Italians of the north.[42] A 2002 study found the prevalence of blue eye color among whites in the United States to be 33.8% for those born between 1936 and 1951 compared to 57.4% for those born between 1899 and 1905.[7]
As melanin production generally increases during the first few years of life (especially if exposed to the sun), the blue eyes of some babies may darken as they get older.[citation needed]
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