That is the question being asked today after it was discovered scientists may have developed a technique to recreate human corneas involving the use of limbal stem cells. These stem cells are necessary for good eyesight. This new process could help numerous people who have lost their sight. It has been tested on mice, and scientists hope to be able to use this acquired knowledge in a clinical setting.
The full story here: http://www.bbc.co.uk/news/health-28106253