article_snippet.sent: A surgeon first implants a small silicon chip with 150 electrodes on the retina.
article_snippet.sent: To use the gadget a surgeon must first implant a small silicon chip with 150 electrodes on the retina.
article_snippet.sent: A surgeon first implants a small silicon chip with 150 electrodes on the retina.
highlights_snippet.sent: A surgeon implants a small silicon chip with 150 electrodes on the retina .
  