A lack of optometrists means many in the developing world ca n't get glasses . Josh Silver has developed glasses with lenses that can be altered by the wearer . In the developing world millions of people struggle to operate machinery , read from a blackboard , or just see the world around them , because they do n't have access to the eyeglasses they need . Comment: Global Vision 2020 is training charity workers to dispense the glasses .
A lack of optometrists means many in the developing world ca n't get glasses . Josh Silver has developed glasses with lenses that can be altered by the wearer . Comment: Global Vision 2020 is training charity workers to dispense the glasses .