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New discovery in China/ Contact lenses that work in the dark are being created

2025-05-23 22:46:00, Kuriozitete CNA

New discovery in China/ Contact lenses that work in the dark are being created

Scientists in China have developed contact lenses that allow users to see light that is normally invisible to the human eye. Even more interestingly, the lenses work best with closed eyelids, and other versions could help correct color blindness.

The human eye can see a relatively limited range of colors, light with wavelengths between about 400 and 700 nanometers. In the typical human-centric way, we call it the 'visible' part of the spectrum, even though other animals can see beyond it.

In a new study, scientists have helped people catch a glimpse of light between 800 and 1,600 nanometers long, a range we can't normally see, known as infrared. The trick is to wear a pair of contact lenses embedded with nanoparticles that convert infrared wavelengths into visible ones.

The special lenses don't block the user's ability to see visible light, they simply add infrared sources to the mix. In tests, users could identify flashing signals from infrared LEDs and tell which direction the light was coming from.

Perhaps the most intriguing finding is that those who wore them could still see infrared light with their eyes closed, in fact, their special lenses seemed to work better than if they had them open. This is because infrared light penetrates deeper into the skin than visible light, so the eyelids filter out the most intense glow. /CNA





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