The eye is essentially a biological camera. It uses the light around us to create spectacular images that help us navigate ...

A new optical illusion excellently illustrates just how finicky our eyes are when it comes to perceiving colors.

Physicists and vision scientists are lining up behind a provocative claim: the rich color we call purple is not a property of light at all, but a story the brain tells itself. Light in the real world ...

Here’s what it signals—and why it makes a ton of sense.

You're introduced to someone and your attention catches on their eyes. They might be a rich, earthy brown, a pale blue, or the rare green that shifts with every flicker of light. Eyes have a way of ...

Pupil size in people with synesthesia changed depending on how bright or dark the perceived colors were.

Butterfly wings get their color in ways that almost feel impossible. Up close, each wing is made of countless tiny scales that either hold pigment or manipulate light. The oranges, reds, and browns ...