Blue eyes appears to have originated some where between 6,000 to 10,000 years ago and where highly selected for. Scientists aren't sure what the advantages of blue eyes are but there are two leading theories as to why they where passed on: blue eyed people are highly desirable sexually or maybe they hitchhiked with a more advantageous gene, light skin.
Cite:
http://genetics.thetech.org/ask-a-geneticist/origin-blue-eyes
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