Blind capoeira teacher Joao Kanoa is guided by his students as he returns home after a session at the Fallet slum, in Rio de Janeiro April 26, 2013. Kanoa says he lost his vision at work seventeen years ago when the change of temperature inside a cold-storage room damaged his retina. Picture taken April 26, 2013. REUTERS/Pilar Olivares (BRAZIL - Tags: SOCIETY)