A survey conducted in the U.S. by VSP Vision Care...

5 October 2009

A survey conducted in the U.S. by VSP Vision Care and Prevent Blindness America (PBA) showed that more than one in five students aged 12 to 17 had problems seeing their classroom's blackboard, and more than 25 percent complained of headaches. Nearly two-thirds of children under age 6 have never ...

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