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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?

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.
Glasses help people to see by focusing light onto the retina. Marcella Cheng/The Conversation

Curious Kids: How do glasses help you see?

Many people, from children to the elderly, wear glasses. Andy, age 5, wants to know how they work.

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