Both outfits make coronary stents, wire-mesh devices used to keep arteries open, and other medical devices.

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In 1991, when Second Sight's Dr. Greenberg was still in medical training at Johns Hopkins University, he watched a retinal surgeon perform a procedure where he placed a wire in a patient's eye and ran a bit of electrical current through it, and the patient saw a spot of light.

WSJ: FDA Approves Bionic Eye