Students perform eye-exercises in a classroom at a bilingual middle school in China's far northwest Xinjiang. Eye exercises have been mandated in China since 1963 to help reduce the rate of eye disorders. Critics question their effectiveness.
In Hong Kong, rates of myopia are as high as 87%. This shows bespectacled passengers in Hong Kong riding the subway.
Reading, studying and screen time have long been blamed for myopia. But growing research indicates that such belief may be wrong.