"When the tide came in, these kids started swimming. But not like I had seen before. They were more underwater than above water, they had their eyes wide open - they were like little dolphins."
Deep in the island archipelagos on the Andaman Sea, and along the west coast of Thailand live small tribes called the Moken people, also known as sea-nomads. Their children spend much of their day in the sea, diving for food. They are uniquely adapted to this job - because they can see underwater. And it turns out that with a little practice, their unique vision might be accessible to any young person.
In 1999, Anna Gislen at the University of Lund, in Sweden was investigating different aspects of vision, when a colleague suggested that she might be interested in studying the unique characteristics of the Moken tribe. "I'd been sitting in a dark lab for three months, so I thought, 'yeah, why not go to Asia instead'," says Gislen.
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