Isabella Beukes, of Santa Rosa, Calif., has been legally blind for more than 40 years. An experimental treatment derived from embryonic stem cells seems to have enabled her now to see not just color but also some shapes.
Tim Hussin for NPR
How much oxygen should severely premature infants receive? A study that sought to answer the question has been criticized for not fully informing parents about the risks to their children.
Sue Freeman, 78, checks her email at her home in Laguna Beach, Calif., on Saturday. She says her eyesight improved markedly since she received an experimental stem-cell procedure last July.
Melissa Forsyth for NPR