JiveSync

At the back of your eyes, on the retina, are light sensitive cells called rods and cones. These start to develop in the womb and by the time a foetus is 28 weeks, he or she can normally see, even in the darkness of the womb. Initially it will be only in black and white, but soon the cones become wired up, getting ready to colour our world. Light-sensitive proteins convert red, green and blue, the separate components of the light entering our eyes, into nerve impulses. These are sent to the brain and interpreted as a colour image. But if these vital proteins don't function properly you will live in a black and white world for the rest of your life.

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