We can see about a million different colours Most humans are trichromats, which means our eyes have three different types of cone cells: red, green or blue, able to detect about 100 shades each.

A new surgical procedure to permanently change eye color is gaining traction in the U.S. But many ophthalmologists fear ...

Iris tattooing and implants can give you a whole new look, but experts urge caution due to complication risks.

Green light is in the middle. Our eyes only detect three colours: red, green and blue. By combining these we can perceive many different colours Our eyes only detect three colours: red ...

The animal's eyes change from a golden colour to a deep blue as summer fades to winter, helping it to see in dramatically different light levels. The part that changes colour is called the tapetum ...

Although the eyes of garden snails can't focus or see colour, they would just about be able to make out this other snail moving past, or a predator approaching. The snail's ability to discern ...