Before the appearance of the mutation, the authors state, all humans shared brown eyes, which is the natural color of melanin ...

Medically reviewed by Christine L. Larsen, MD Photophobia is an abnormal sensitivity to light. It is associated with dry eye ...

Blue eyes are caused by a gene mutation. For years, researchers had searched for it on the OCA2 gene. The OCA2 gene determines how much brown pigment is in our eyes. But what they were looking for ...

Hazel eyes are a mix of brown, gold, green ... hazel eyes are also not the most common eye color around. Blue-eyed folks may be rarer, but their eye color has a fascinating history.