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.
There are also concerns that kids are starting to develop vision disorders even earlier in their lives.
A "bright light classroom" in China is equipped with translucent ceilings and surrounded by floor-to-ceiling windows that increase students' exposure to natural light.
The open classroom in the city of Yang Jiang in Guangdong province is being used in a study to see whether this staves off rates of myopia.