A new perspective
Credit:
Sheng Wang/CC BY-SA
The team tested their lenses on humans by asking subjects to detect flashing signals, akin to Morse code, in the infrared, and to identify the direction of incoming infrared light. The subjects could only perform those tasks while wearing the special contact lenses.
The authors were intrigued to find that both mice and humans were better able to discriminate infrared light compared to visible light when their eyes were closed, which they attribute to the fact that infrared light can penetrate the eyelid more effectively than visible light. They also tweaked the nanoparticles so that they could color-code different infrared wavelengths, thereby enabling wearers to perceive more details in the infrared, an adaptation that could help color-blind people perceive more wavelengths.
There are some limitations. The contact lenses are so close to the retina that they can’t really capture fine details very well, because the converted light particles tend to scatter. The team made a wearable glass version of their nanoparticle technology so wearers could get higher resolution in the infrared. And right now the lenses can only detect infrared light projected from an LED; increasing the sensitivity of the nanoparticles to pick up lower levels of infrared would address this issue.
Still, it’s a significant step. “Our research opens up the potential for non-invasive wearable devices to give people super-vision,” said co-author Tian Xue, a neuroscientist at the University of Science and Technology of China. “There are many potential applications right away for this material. For example, flickering infrared light could be used to transmit information in security, rescue, encryption or anti-counterfeiting settings. In the future, by working together with materials scientists and optical experts, we hope to make a contact lens with more precise spatial resolution and higher sensitivity.”
DOI: Cell, 2025. 10.1016/j.cell.2025.04.019 (About DOIs).
