An anonymous reader quotes a report from The Guardian: Researchers in China revealed they have developed a contact Lens that can sense an increase in Pressure within the eye and release an anti-glaucoma drug should the pressure exceed a certain level. Writing in the journal Nature Communications, the team describe how they created the device using an upper and lower lens, with a snowflake-shaped pressure sensor and wireless power transfer device sandwiched between them around the rim of the Lenses. The arrangement appears to give the effect of the wearer having golden irises. However, the team say the design allows the necessary components to be included in the device without blocking the wearer's view or irritating the eye. When the pressure inside the eye increases, the gap between the upper and lower lenses decreases. This is detected by the pressure sensor by means of a cantilever. The sensor then sends a signal to the wireless system which subsequently triggers the release of an anti-glaucoma drug, from a hydrogel attached to an electrode, and enables it to cross the cornea of the eye. The drug, brimonidine, acts to reduce the pressure within the eye. The study reveals that the contact lenses have so far been tested on pigs' eyes and on the eyes of living rabbits -- albeit with smaller-sized lenses -- although trials have yet to be carried out in humans. The researchers note the lenses are not only soft and minimally invasive but are also battery-free, adding that the approach could be expanded to help tackle other eye diseases. "We can now imagine that a glaucoma sufferer wearing these contact lenses will not only receive real-time information about the pressures within the eye, since the contact lens has built-in wireless capacity and can easily communicate with an app on your smartphone, but also receive, for example, pressure-relieving drugs when needed," said Prof Zubair Ahmed from the Institute of Inflammation and Aging at the University of Birmingham. "The materials required to create such contact lenses are inexpensive and soon could be mass-produced," he added.

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