The gold medals that Im Dong-Hyun has won so far are team golds, which South Korea claimed at Athens in 2004 and Beijing in 2008.

BBC: Korea's blind' archer Im Dong-Hyun aims for 2012 gold

And although Im Dong-Hyun can barely read the big letters at the top of an optician's chart, he can hit that small, yellow circle time and time again.

BBC: Korea's blind' archer Im Dong-Hyun aims for 2012 gold

But Im Dong-Hyun simply aims at the ill-defined yellow blob, shimmering and fuzzy at 70m, and somehow his poise, strength and technique combine to put the arrow right on target.

BBC: Korea's blind' archer Im Dong-Hyun aims for 2012 gold