Like most human traits, blue eyes are determined by genes, and no two people have exactly the same hue. It works a lot like ...

It seems a little unfair. The ladies love blue eyes, and babies already have a cuteness advantage. The iris is the muscular ring around the pupil. And its color depends on a protein called melanin ...

Lighter eyes are idealised across societies, which often posit brown eyes on the most ‘boring’ end of ... when those windows are a shade of ocean blue, looking out into cloudless skies.