Comment on Infrared contact lenses let you see in the dark

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Bubs@lemm.ee ⁨5⁩ ⁨weeks⁩ ago

TL;DR from Wikipedia: In photon upconversion, two or more incident photons of relatively low energy are absorbed and converted into one emitted photon with higher energy.

Basically photons are combined into a photon that is nearer in wavelength to visible light.

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