A blind man was able to read large letters and navigate around big objects by using a tiny camera wired directly to his brain, the first artificial eye to provide useful vision. The 62-year-old man does not see an image. He perceives up to 100 specks of light that appear and disappear, like stars that come and go behind passing clouds, as his field of vision shifts. He can recognize a 2-inch tall letter from five feet away and hang a hat on a mannequin. It is very different from the visual experience that normal people enjoy, and it is the thing that Health mysteries are made of.
