Genetics are a big part of it, like you would expect, but its a bit more nuanced than what we learned in high school biology.

Studies have suggested that the contrast between the white of human eyes - known as the sclerae - and the colourful irises allows others to detect the direction of our gaze. The ability to detect gaze ...

Heterochromia is the term used to describe a difference in a person’s eye color. Heterochromia of the eye is caused by variations in the concentration and distribution of melanin, the pigment that ...

Most of us have seen a mood ring in our lifetimes. Depending on your body temperature, the ring would change colors. It seemed like magic back then, but as an adult you may have learned that there are ...