A followup interview a year later on the status of research into the use of gene therapy to treat a type of congenital blindness. Researchers found that younger subjects have improved the most. Includes a link to a video from the...

A look at research into the use of gene therapy to treat a type of congenital blindness. Aired May 2, 2008 [23:33]

The story of a woman who lost her vision after a stroke. Her primary visual cortex was severely damaged. But then she began to see rain and other moving water. [3:34]

Very basic overview and what occurs for people with color blindness. Contains many links to related articles.