Nowadays, more kids need to use eyeglasses than those in the old days. when buying such prescription glasses, we generally recommend people select single vision for reading include ADD value, as some children may not only have eye problem with distance view, but also amblyopia, which is the eye condition noted by reduced vision not correctable by glasses or contact lenses and is not due to any eye disease. It is estimated that three percent of children under six have some form of amblyopia. so, eyeglasses with a plus ADD may do great favor to these kids!