How do visually-impaired athletes compete in the Long Jump?

http://ifttt.com/images/no_image_card.png Watch how BRAZIL’S  Silvania Costa won Gold in RIO     How do visually-impaired athletes compete in the Long Jump? Watch how BRA 🇧🇷’s Silvania Costa won #GOLD. #Athletics pic.twitter.com/MnbjMdwcfP — Rio 2016 (@Rio2016_en) September...

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