In effect, the turned-down switch diluted brown eyes to blue. If the OCA2 gene had been ... gene and the genetic mutation associated with turning down melanin production. Over the course of ...

turn off the gene entirely, but rather limits its action to reducing the production of melanin in the iris -- effectively "diluting" brown eyes to blue. The switch's effect on OCA2 is very ...

The more melanin inside the iris, the more light is absorbed, meaning less light is reflected out, leaving the iris appearing brown. But when someone has blue eyes, they have less melanin in their ...

eyes are golden in the summer, but turn a deep blue in the winter to capture more light," reads the caption of a Dec. 3 Facebook post. The post features side-by-side close-up images of a brown ...

A rare genetic disorder called Waardenburg Syndrome gives Indonesia’s Buton tribe their striking blue eyes, often linked with ...

Ulku Dogan had surgery to make her eyes blue after wearing colored contact lenses for years. Keratopigmentation involves making a channel in the cornea and placing colored dye inside. The ...

Eyes come in many shades, ranging from dark to light brown, and from green, hazel, and gray, to blue. But despite the many variations that we perceive, there are actually only two different ...

Eyes that are not brown do not have different color pigments. Instead, they have less melanin. An iris with the least melanin will appear blue, while those with a little more melanin may appear ...

Reindeer may be best known for fictional Rudolph's glowing red nose, but now scientists find the animals can alter color elsewhere as well — the backs of their eyeballs change from gold in the ...

Last year, teens were warned of the risk of blindness after a trend had them staring straight into the flashlight of their phones in the misguided hopes of watching their brown eyes turn blue.

For example, two brown-haired, brown-eyed parents can have a child with blonde hair and blue eyes. Both parents can display recessive gene characteristics, and they can pass those to their ...