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Earlens uses a device behind the ear that closely resembles a normal hearing aid. The only difference is that the device converts sound into a light wave and then transmits it to the second part of the system which is a unit implanted on the eardrum that receives the light wave and converts it into sound waves again directly against the eardrum. Obviously this is a more complicated system with more potential for something to go wrong. The manufacturer's website claims that you get a much broader frequency response range. The graph on the site... Read more