“Climbing teaches you a lot about who you are,” says 40-year-old rock climber Jesse Dufton, who has conquered thousands of peaks without the benefit of vision. Dufton, who was born with a rare degenerative condition called rod-cone dystrophy, talks with Lee Cowan about how losing his sight did not lead to him forsaking his potential. [Our thanks to Alastair Lee of BritRock Films.]