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What is Synesthesia?

Are your senses intertwined? Do letters and numbers have colours? You might be a synesthete. Our handy guide looks at the fascinating science behind synesthesia.

Hello Heterochromia!

Heterochromia iridis is a condition that results in changes to the coloured part of the eye. The affects can change from a subtle difference, to a striking contrast.

What is hypermetropia?

Hypermetropia or long-sightedness is a common eye condition where nearby objects appear blurred, but your vision is clearer when looking further away.

Are you a Tetrachromat?

Tetrachromats are able to see up to 9 million more colours than most people who can only see around 1 million. Curious? Read our guide to tetrachromacy.