First-ever images of living human retinas have yielded a surprise about how we perceive our world:

Colour perception is not in the eye of the beholder: it’s in the brain

Images of living human retinas showing wide diversity
of number of cones sensitive to different colours.
(Photo credit: University of Rochester)

Researchers at the University of Rochester have found that the number of colour-sensitive cones in the human retina differs dramatically among people — by up to 40 times — yet people appear to perceive colours the same way.

The findings strongly suggest that our perception of colour is controlled much more by our brains than by our eyes.

    “These experiments show that colour is defined by our experience in the world, and since we all share the same world, we arrive at the same definition of colours.”