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Human eye spots single photons

Ability to detect smallest unit of light focuses debate on vision sensitivity

eye detecting a photon

FLASH OF LIGHT  People were able to detect single photons in a recent study, indicating that human eyes are sensitive to individual particles of light.

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By Emily Conover

- More than 2 years ago

Human eyes are capable of detecting a single photon — the tiniest possible speck of light — new research suggests.