An incredible pair of glasses for kids that lets adults adjust them without formal training. It uses two lenses with a liquid between them and a small attachment for adding or removing the liquid to adjust them. (More liquid creates more of a bulge, creating a stronger prescription, less goes the other way.) If it works as well a advertised, it could revolutionize education throughout most of the world.

http://www.vdwoxford.org/childvision/#oursolution_glasses