From the new York Times http://www.nytimes.com/2008/12/23/health/23blin.html?_r=1
William Duke
BLINDSIGHT A patient whose visual lobes in the brain were destroyed was able to navigate an obstacle course and recognize fearful faces subconsciously.
Blind, Yet Seeing: The Brain’s Subconscious Visual Sense
By BENEDICT CAREY
Published: December 22, 2008
The man, a doctor left blind by two successive strokes, refused to take part in the experiment. He could not see anything, he said, and had no interest in navigating an obstacle course — a cluttered hallway — for the benefit of science. Why bother?
When he finally tried it, though, something remarkable happened. He zigzagged down the hall, sidestepping a garbage can, a tripod, a stack of paper and several boxes as if he could see everything clearly. A researcher shadowed him in case he stumbled.