A new technology to address these problems is in urgent need, and it gives me a strong motivation to start this unconventional project," said Prof. However, regardless of image resolution, angle of views or user-friendliness, the current bionic eyes are still of no match to their natural human counterpart. "I have always been a big fan of science fiction, and I believe many technologies featured in stories such as those of intergalactic travel, will one day become reality. With different materials used to boost the sensors' sensitivity and spectral range, the artificial eye may also achieve other functions such as night vision. Unlike in a human eye where bundles of optic nerve fibers (for signal transmission) need to route through the retina via a pore - from the front side of the retina to the backside (thus creating a blind spot in human vision) before reaching the brain the light sensors that now scatters across the entire human-made retina could each feed signals through its own liquid-metal wire at the back, thereby eliminating the blind spot issue as they do not have to route through a single spot.Īpart from that, as nanowires have even higher density than photoreceptors in human retina, the artificial retina can thus receive more light signals and potentially attain a higher image resolution than human retina - if the back contacts to individual nanowires are made in the future. In the future, those nanowire light sensors could be directly connected to the nerves of the visually impaired patients. GU Leilei from the Department of Electronic and Computer Engineering at HKUST, the team connected the nanowire light sensors to a bundle of liquid-metal wires serving as nerves behind the human-made hemispherical retina during the experiment, and successfully replicated the visual signal transmission to reflect what the eye sees onto the computer screen. The key feature allowing such breakthroughs is a 3D artificial retina - made of an array of nanowire light sensors which mimic the photoreceptors in human retinas. The Electrochemical Eye (EC-Eye) developed at HKUST, however, not only replicates the structure of a natural eye for the first time, but may actually offer sharper vision than a human eye in the future, with extra functions such as the ability to detect infrared radiation in darkness. Scientists have spent decades trying to replicate the structure and clarity of a biological eye, but vision provided by existing prosthetic eyes - largely in the form of spectacles attached with external cables, are still in poor resolution with 2D flat image sensors.
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