LED mounted in a contact lens for possible virtual, augmented reality displays
Every so often, internet news aggregator sites run a story about a research group that put an LED into a contact lens, then inserted it into a rabbit s eye. I figured that I would try the same thing, but put the lens into my own eye. I accomplished this by laminating a coil of wire and an 0402 surfacemount LED between two ordinary soft contact lenses. I was hoping the lenses would stick to each other, but they did not, so I ended up fixing the edges together by pinching the plastic together with hot tweezers. This held well enough to capture a minute of video with the LED illuminated in my eye. For video purposes, I mounted the LED facing outward. An actual VR, AR display would have the LED facing inward. I powered the LED by using a very primitive sparkgap transmitter built from a mechanical relay to send RF energy into a larger coil held near my eye. The large coil coupled the energy into the contact lens coil and pulsed the LED.
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