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Here are a few facts about blue eye color you might not know: It appears that a genetic mutation in a single individual in Europe 6,000 to 10,000 years ago led to the development of blue eyes, according to researchers at the University of Copenhagen.

"Originally, we all had brown eyes," said Hans Eiberg, associate professor in the Department of Cellular and Molecular Medicine at the university and lead author of the study.

And because eye damage from UV and blue light appears to be related to your lifetime exposure to these rays, wearing sunglasses that block 100 percent UV and most blue light should begin as soon as possible in childhood.

Photochromic lenses are another great way to protect blue eyes from UV radiation.

A final note about blue eyes that you might find interesting: Research suggests that having blue eyes may increase your risk of alcohol dependency if you are a drinker.

A study published in American Journal of Medical Genetics, Part B: Neuropsychiatric Genetics found that European Americans with blue eyes had up to 83 percent higher odds of becoming dependent on alcohol, compared with matched controls who had darker eye colors. Three genome-wide association studies and a linkage analysis identify HERC2 as a human iris color gene.

"But a genetic mutation affecting the OCA2 gene in our chromosomes resulted in the creation of a 'switch,' which literally turned off the ability to produce brown eyes." Eye color depends on the amount of a single type of pigment (called melanin) in the iris of the eye.

This genetic switch, located in the gene next to the OCA2 gene, limits the production of melanin in the iris — effectively "diluting" brown eyes to blue.

For these reasons, people with blue eyes should be extra cautious regarding their exposure to sunlight.

Even if you and your mate both have blue eyes, that's no guarantee your child's eyes will also be blue.

(Here's a royal example of the unpredictability of eye color: Princess Charlotte, the young daughter of blue-eyed Prince William and green-eyed Kate Middleton, has blue eyes.

It may take many years before we know the risks associated with cumulative exposure to blue light from computers and smart phones. His special interests include contact lenses, nutrition and preventive vision care.

But many eye care professionals believe it's prudent to use caution when it comes to protecting your eyes from these devices — especially if you have blue eyes.




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