Island of the colour blind.

Third episode in a 6-part series in which Dr. Oliver Sacks travels the world in search of cases of rare neurological disorders and relates his findings to existing knowledge of these diseases. Part 3: Island of the Colour Blind On the small Pacific island of Pingelap, one in twelve people are colour-blind. Oliver Sacks investigates the reasons for this and assesses the effects of colour-blindness on the inhabitants' lives.