A team of researchers at Princeton University, led by Michael McElpine, as part of an ambitious project by the US military, has developed a unique technology for creating 5-layer contact lenses using 3D printing. Each of the layers of such lenses can perform different functions, for example, one of them will emit light directly onto the retina of the eye.
Made from a transparent polymer material, lenses can be "equipped" with miniature components - light-emitting diodes, wires made of silver nanoparticles and organic polymers, which will function as electronic circuits.
When creating contact video lenses M. McElpile and his colleagues faced a number of problems. In particular, for a long time it was not possible to find a substance that would glue all the layers together. The second problem was associated with the individual shape of the eyeballs, therefore, in the manufacture of each product, 2 video cameras had to be used.
The interest of the US Air Force command in this project is easy to explain, since its goal is to create a system for transmitting information about the air situation directly to the pilot's eye. In addition, it is planned to install sensors that will record the degree of eye fatigue.