Scientists have developed innovative contact lenses that grant humans the ability to see infrared light without the need for external power sources or invasive procedures. These lenses, described in the journal Cell on May 22, 2025, convert infrared radiation into visible colors, effectively expanding the spectrum of light perceptible to the human eye.
The technology relies on nanoparticles embedded within a transparent, flexible polymer. These nanoparticles absorb infrared light, specifically near-infrared light in the 800-1600 nm range, and convert it into wavelengths visible to humans (400-700 nm). In tests, users could identify flashing signals from infrared LEDs and tell which direction the light was coming from. Interestingly, the lenses seemed to function even better when the wearer's eyes were closed, as infrared light penetrates the eyelids more effectively than visible light, reducing interference.
While current versions require strong LED sources, future research aims to enhance the lenses' sensitivity for broader applications. Potential uses include assisting individuals with low vision, aiding professionals in dark environments (security, rescue), and even incorporating the technology into advanced glasses or wearables. The researchers also suggest potential applications in transmitting information through flickering infrared light for security, encryption, or anti-counterfeiting purposes.