A groundbreaking innovation by Chinese scientists is redefining the boundaries of human vision. Researchers from the University of Science and Technology of China have developed contact lenses with embedded nanoparticlesthat allow users to see light in the infrared spectrum – wavelengths that are normally invisible to the human eye.
How the technology works
The lenses utilize special nanoparticles that convert infrared light into visible light. The human eye is programmed to perceive only a small range of colors — specifically, light with wavelengths from about 400 to 700 nanometers. We call this the “visible” part of the spectrum, even though other animals can see beyond that.
A recent scientific study, however, takes things one step closer to the… supernatural. With revolutionary contact lenses, researchers have managed to extend the range of human vision into the infrared, that is, to wavelengths from 800 to 1,600 nanometers — a range that is normally invisible to humans. The contact lenses are equipped with special nanoparticles, which transform infrared light into wavelengths that we can see.
See also: New cells discovered in the eye restore vision
The special lenses don't disrupt the wearer's ability to see visible light, they simply add infrared sources. In tests, wearers were able to identify signals from infrared LEDs and tell which direction the light was coming from.
The most unexpected finding? The lenses work even better with eyes closed. That's because infrared light penetrates deeper into the skin than visible light, so the eyelids essentially filter out the most intense glare.
Expanding perception – but not new colors
It's worth noting that users don't see "new" colors. The contact lens nanoparticles simply convert infrared wavelengths into familiar colors that the retina can process.
Taking it a step further, the researchers showed that a more detailed version of the contact lenses could allow wearers to recognize different parts of the infrared spectrum. The nanoparticles encoded infrared wavelengths color-coded: light at 808 nanometers appeared green, 980 nanometers was blue, and 1,532 nanometers looked like red.
The research team believes that this technology could in the future be adapted to help people with color blindness. While it won't "restore" the colors they can't see, the lenses could transform wavelengths that are invisible to them into shades that their eyes can perceive — essentially opening a new window into the color spectrum.
See also: Neuralink Blindsight: FDA approval for vision restoration implant
From contact lenses to smart glasses
The lenses have one drawback: because they are located so close to the retina, the image of the transformed light is slightly blurry. For better clarity, researchers have developed special glasses with the same technology, offering clearer vision in the infrared.
In experiments, the team demonstrated that with these glasses, objects that appeared colorless to the naked eye took on vivid colors – depending on how they reflected infrared light. This opens up applications in security, thermal signature detection or encrypted visual messages.
" Our research opens up the possibility for non-invasive wearable devices to provide people with hypervision. There are many potential applications. For example, flickering infrared light could be used to transmit information in security, rescue, encryption or anti-counterfeiting," says Tian Xue, a neuroscientist at the University of Science and Technology of China, who led the research team.
What's next?
The team admits that for now, the lenses only work with strong infrared light sources, such as LEDs. However, they are optimistic that future improvements will make them more sensitive to less intense light, bringing us one step closer to the idea of... supervision.
The study was published in the scientific journal Cell, highlighting how the convergence of nanotechnology and biooptics may be the key to expanding human senses in the 21st century.
See also: China: Robot dog-guide helps visually impaired people
This innovation is impressive from both a technological and scientific perspective. Contact lenses with nanoparticles that enable vision in the infrared spectrum are a major step towards “augmented” human vision — not through screens or devices, but directly with our eyes.
Although it is still in its early stages — and works mainly with powerful infrared sources — the technology could have many applications if and when it improves!
Source: www.sciencealert.com
