While the best hair colors for blue eyes include any shade of blond and brown hair, the list of best hair colors for brown eyes is limitless. Green eyes, on the other hand, look best when paired ...

Across the world, 8% to 10% of people have blue eyes, which is still second place to brown eyes, which 70% to 80% of all individuals have. The rarest eye colors are green and gray.

In effect, the turned-down switch diluted brown eyes to blue. If the OCA2 gene had been completely shut down, our hair, eyes and skin would be melanin-less, a condition known as albinism.

In 2008, a study led by Hans Eiberg from the University of Copenhagen claimed that all blue eyes link back to a single ancestor who lived between 6,000 and 10,000 years ago.

Green irises (the rarest eye color) have less melanin than brown eyes but more than blue eyes, for instance. “Brown is on one end, blue on the other, and hazel and green are in between,” Dr ...