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

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 ...

The team, who experimented on themselves and others, hope their findings could one day help improve tools for studying color ...