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Contact lenses that monitor health

South Korean researchers have taken an important step towards creating a contact lens capable of measuring certain health parameters, such as blood sugar level. Using a mixture of carbon molecules, polymers, and solvent, a team led by Jang-Ung Park, from the Institute of Nanoscience and Technology and the Center for Nanomedicine, both in Seoul, produced a special ink that can be used to print micro electronic circuits at the edges of contact lenses, where they do not block the user’s vision. On these circuits, they installed a set of silver nanofibers, 400 nanometers in diameter (Science Advances, December 6, 2019). The nanofibers functioned as antennas, allowing the lens to be wirelessly charged. The new lens was tested on animals and a human volunteer.