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American Focus > Blog > Tech and Science > Special contact lenses let you see infrared light – even in the dark
Tech and Science

Special contact lenses let you see infrared light – even in the dark

Last updated: May 22, 2025 11:05 am
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Special contact lenses let you see infrared light – even in the dark
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Contact lenses have taken a revolutionary step forward in enabling people to see beyond the visible light range. These new contact lenses have the capability to pick up flickers of infrared light, even in the dark or with eyes closed. The technology behind these lenses involves engineered nanoparticles that can absorb and convert infrared radiation, particularly in the near-infrared wavelength range of 800 to 1600 nanometres, into visible blue, green, and red light that can be perceived by the human eye. This is akin to the technology used in night-vision devices, but with the added benefit of being lightweight and requiring no additional power source.

Researchers, led by Yuqian Ma at the University of Science and Technology of China, have developed these innovative contact lenses. By incorporating nanoparticles such as sodium gadolinium fluoride, ytterbium, and erbium into the lenses, they have opened up new possibilities for military personnel. The lenses offer discreet, hands-free night-vision capabilities that surpass the limitations of bulky night-vision goggles or scopes. Peter Rentzepis, a researcher at Texas A&M University who has also worked on similar nanoparticle applications in eyeglass lenses, sees immense potential in this technology.

Although these contact lenses do not yet provide detailed night vision, they have shown promising results in tests on humans and mice. The lenses can currently detect high-intensity, narrowband LED light sources rather than lower levels of ambient infrared light. While researchers like Mikhail Kats from the University of Wisconsin-Madison acknowledge the audacious nature of this research, they also point out that the lenses may not yet enable tasks like reading in the infrared or navigating dark environments.

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One fascinating application of these new contact lenses is their ability to convert invisible infrared flashes into visible light. By varying the frequency, number, and color of different light flashes, researchers have successfully encoded and transmitted letters of the alphabet using these lenses. This innovative approach builds upon previous studies where nanoparticles were injected directly into the eyes of mice to provide infrared vision. The wearable contact lenses offer a safer and more practical alternative for human use, although potential health and safety risks, such as heat exposure and nanoparticle leakage into eye tissue, still need to be addressed.

In conclusion, the development of contact lenses that can provide infrared vision opens up a world of possibilities for enhanced human perception. While the technology is still in its early stages, the potential applications in fields such as defense, communication, and healthcare are vast. With further research and refinement, these contact lenses could become a game-changing innovation in the realm of wearable technology.

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