we can model what the world would look like through their eyes. The images below each show a scene as viewed by a human. Drag the slider to the left to see how an animal would see the same scene.

Non-human primates that have trichromatic colour vision ... that more complex eyes and cone cells slowly developed from these early versions, letting us see the world in vibrant Technicolor.

"To put it into perspective axons and dendrites are only about a micrometer thick, that's 100 times thinner than a standard strand of human hair ... red sensors in our eyes.

In this film, Dr Ben Price explains the intricate workings of human eyes. By comparing our eyes ... using information from the surrounding picture or other eye. Discover one of the more unusual ...