Infrared contact lenses using nanoparticles convert near-infrared (800–1600 nm) into visible light, enabling users to perceive infrared wavelengths without external power.

Near-infrared light sits just outside the range of wavelengths that humans can normally detect. Some animals can sense infrared light, although probably not well enough to form images.

Infrared contact lenses let you see in the dark Mice and humans were able to detect infrared light, even with their eyes closed, with limited resolution.