"Learning Ally in Upland has a volunteer base of 138 people, but more are always needed. According to organization statistics, one out of every five individuals in the United States has a learning disability; 40 percent of high school students can't read well enough to benefit from traditional textbooks; and more than 14 million people in this country have low vision."
http://www.mercurynews.com/california/ci_20145984/learning-ally-volunteers-assist-those-unable-read