The St. Louis Post-Dispatch (7/27, Sultan) reports, "One in four children in the US have undetected vision problems which could impair learning, according to the American Optometric Association." Because "approximately 80 percent of learning comes through a child's eye," some experts believe that sending children "to school without good vision could be setting them up for failure or even cause them to be misdiagnosed with a learning disability." The AOA recommends that school-aged children have "an eye exam every two years if no vision correction is required. Children who need eyeglasses or contact lenses should be examined annually or as recommended by their optometrist."