Researchers, primarily led by teams at the University of Science and Technology of China (USTC) and international collaborators, have developed revolutionary contact lenses that enable humans to perceive near-infrared light. These lenses utilize upconversion nanoparticles (UCNPs) that absorb multiple low-energy infrared photons and re-emit them as higher-energy visible light directly onto the wearer's cornea. Unlike traditional night-vision goggles that require batteries and bulky electronic amp
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