How many people around the world need glasses and don’t have them? Until surprisingly recently, nobody knew. Now we have an eye-popping answer: 2.5 billion. Show more
Discover 11,128,835 listings and 279,911 playable programmes from the BBC
How many people around the world need glasses and don’t have them? Until surprisingly recently, nobody knew. Now we have an eye-popping answer: 2.5 billion. Show more