Cancer Survivor Aids NASA Astronauts Losing Vision

A former cancer patient who has a chemotherapy port still in his skull is working with NASA to help scientists determine why some astronauts on long missions lose their vision.

A former cancer patient who has a chemotherapy port still in his skull is working with NASA to help scientists determine why some astronauts on long missions lose their vision. Researchers think that blood pools in the brain in zero gravity, causing pressure on the eyes. (WFAA-TV)