Paul Martin

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  • Professor of Clinical Ophthalmology & Eye Health, Central Clinical School, Save Sight Institute, University of Sydney
Colour blind people are really good at spotting things that are far away, and they are better than most people at telling things apart by their shape. Shutterstock

Curious Kids: why are people colour blind?

Paul Martin, University of Sydney

Some colour blind people only have two kinds of cone cell in their eye. Others have three kinds, but the cones do not pick up the same light waves as the cone cells in most people’s eyes do.
This is how a person without colour blindness would see these coloured test tubes. Bigstockphoto / Craig Colvin

Explainer: what is colour blindness?

Paul Martin, University of Sydney

Here are six test tubes filled with coloured dyes. How many different colours do you see? Most people say six, but some people would say only two or three. There are even some (very rare) people who see…

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