This is a Moken girl of the Surin Islands, Thailand. Children in this village are ...

... able to make their pupils smaller and change their lense shape to see better underwater. Seals and dolphins have a similar ability. At a very young age, children are introduced to the water and develop the necessary skills for underwater fishing and navigation. They also develop an immunity to salt water eye rash. Unfortunately, modern times, and the lack of necessity to survive as a hunter gatherer, has put a damper on the once coveted ability of these youngsters.