Researchers behind a recent study claim to have discovered a new color that the natural, naked eye cannot perceive — 'olo,' a ...

The human eye can see millions of colors — but no eyes have ever before beheld "Olo." Only five people on the planet — all ...

In a study published in Science Advances on April 18, a group of five researchers stimulated retina cells in participants' eyes, who, afterwards, claimed to have seen a color no human has seen before.