More than 700 million of people world wide are suffering from defective vision. They could be helped by a pair of simple eyeglasses. These people - many of them living on 1 Dollar a day or less - don't have the money to buy eyeglasses.
These people can't work and many young people are not able to go to school due to weak eyesight. The estimated loss of income caused by this fact is valued at about 200 billion USD per year.