Top Dyslexia Experts Helping California Develop Public School Guidelines “Dyslexia is the single largest learning disability. It is estimated by IDA that up to 20% of the overall population displays some signs or symptoms of dyslexia, a language-based learning disability. In California alone, this means over 1 million of our public school students are at risk of being dyslexic. http://www.prweb.com/releases/2016/04/prweb13365484.htm