Special contact lenses let you see infrared light – even in the dark
Nanoparticle-infused contact lenses can transform infrared radiation into different colours of visible light, potentially enabling a new form of night vision – no batteries required
By Jeremy Hsu
22 May 2025
New contact lenses can provide infrared vision
olga Yastremska/Alamy
Contact lenses have enabled people to see beyond the visible light range, picking up flickers of infrared light even in the dark – or with their eyes closed.
The lenses contain engineered nanoparticles that absorb and convert infrared radiation – specifically, a near-infrared wavelength range of 800 to 1600 nanometres – into blue, green and red light visible to the human eye. That is the same trick night-vision devices use to help people see in the dark, but the contact lenses weigh much less and require no additional power.
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“The contact lenses would provide military personnel with discreet, hands-free night-vision capabilities that overcome the limitations of bulky night-vision [goggles or scopes],” says Peter Rentzepis at Texas A&M University, who has done related research applying the same nanoparticles – sodium gadolinium fluoride, ytterbium and erbium – to eyeglass lenses.
The new wearables, developed by Yuqian Ma at the University of Science and Technology of China and his colleagues, don’t provide detailed night vision yet. That is because they can pick up only “high-intensity, narrowband LED” light sources, says Rentzepis, rather than lower levels of infrared light from ambient sources.
“It’s an audacious paper but, using just the contact lens, you wouldn’t be able to read a book in the infrared, or navigate down a dark road,” says Mikhail Kats at the University of Wisconsin-Madison, who was not involved in the research.
