Blind capoeira teacher Joao Kanoa (L) gathers with his students after a session outside his home at the Fallet slum, in Rio de Janeiro April 12, 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 12, 2013. REUTERS/Pilar Olivares (BRAZIL - Tags: SOCIETY)