Contact lenses of the future will be controlled by computers

pte20240514023 Research/Development, Technology/Digitalization

Nanjing University’s smart hi-tech system records eye movements in high resolution

Eye: New high-tech contact lens could control computers in the future (Photo: Helmut Strassle,

Eye: New high-tech contact lens could control computers in the future (Photo: Helmut Strassle,

Nanjing (pte023/14.05.2024/12:30)

New intelligent contact lenses by a team led by Fei Xu from the College of Engineering and Applied Sciences Nanjing University Can be used to run computers. They are ideal for people who are unable to move their hands or can only move them to a limited extent. It is also conceivable that it could be used in healthcare and augmented reality (AR) applications, according to experts.

RFID captures line of sight

Like conventional visual aids, the lenses are made of flexible silicone. It is biocompatible and therefore well tolerated. While making the lenses, the researchers attached four small RFIDs that record data on the direction of vision. This happens without a battery. The required current is supplied by a reading device that creates an electromagnetic field. It is captured by RFID and converted into electricity. It is used to transmit data to the reader wirelessly.

“Miniature contact lenses that seamlessly connect the virtual and real worlds will be the ultimate form of AR technology. Human-machine interaction technology based on eye recognition is one of the most important components,” says developer Xu.

Major frequency changes

Each RFID transmits its own frequency signals. As the eye moves, the relative positions of the tags change, which also changes the frequency of the transmitted signal. By detecting and analyzing these frequency changes, the computer can determine the direction and magnitude of eye movements in real time.

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“This technique eliminates the possibility of leakage of iris and other biometric information. Contact lenses are very precise, with an angular accuracy of less than 0.5 degrees of eye movement, which is even smaller than the angle of view provided by the fovea. The fovea is a dense area of ​​cones on the retina that provides high-resolution images and focuses.” Sue concludes.


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