For years, they had been losing their central vision--what allows people to see letters, faces, and details clearly. The light-receiving cells in their eyes were deteriorating, gradually blurring their sight. But after receiving an experimental eye implant as part of a clinical trial, some study participants can now see well enough to read from a book, play cards, and fill in a crossword puzzle despite being legally blind. Science Corporation, the California-based brain-computer interface company developing the implant, announced the preliminary results this week. When Max Hodak, Science's CEO and former president of Neuralink, first saw a video of a blind patient reading while using the implant, he was stunned.