The blind rock climber who sees with his tongue


Erik Weihenmayer went blind when he was 13 years old, but new technology enables him to see with his tongue.

The BrainPort device gives him a sense of space and, together with a friend nearby, helps him scale Utah's formidable Castleton Tower.

Inside the Human Body - Building Your Brain is presented by Michael Mosley and can be seen on BBC One at 9pm on Thursday 19 May 2011 and after on BBC iPlayer