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Imitated focus


Some glasses automatically adjust focus between near and distant objects. Many birds can see for miles while still recognising their immediate environment.

Their retinas have a deep hollow, meaning they are more sensitive to light. With an additional fourth photoreceptor, they can also perceive blue, red, green and UV light.

Inspired by this phenomenon, a Korean research team has developed a camera that simulates the structure of avian eyes.

They also used the titanium-based material perovskite to create an image sensor with four vertically-stacked layers, each one corresponding to a different colour range.

Compared with conventional cameras, in simulations the team’s camera magnified distant objects by twice the size without compromising near focus.

Also intriguing: how animals perceive colour.

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