The other side of this problem is that more than one billion people around the world can't afford glasses.

"More than a billion people around the world need eyeglasses but don’t have them, researchers say, an affliction long overlooked on lists of public health priorities. Some estimates put that figure closer to 2.5 billion people. They include thousands of nearsighted Nigerian truck drivers who strain to see pedestrians darting across the road and middle-aged coffee farmers in Bolivia whose inability to see objects up close makes it hard to spot ripe beans for harvest. Then there are the tens of millions of children like Shivam across the world whose families cannot afford an eye exam or the prescription eyeglasses that would help them excel in school."

https://www.nytimes.com/2018/05/05/health/glasses-developing...