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"The U. S. Centers for Disease Control and Prevention (CDC) state that vision disability is the single most prevalent disabling condition among children. Approximately 80 percent(1) of what children learn in their early school years is visual, so if they can't see a teacher's writing on the blackboard, they will struggle.
Today, of all school-age children across America, 25 percent suffer from a vision problem,(2) that is 12.5 million children who may be unable to see the blackboard or read their textbooks. Research shows that of the children in the 9 to 15 year-old age group only 10 percent of those who needed glasses actually had them.(3)"