Nearly 20 percent of the U.S. population can be characterized as dyslexic. That's one in five students who need intense help in and out of the classroom. "A lot of people believe that dyslexia is a difficulty in the visual system that causes them to see print upside down or backwards. That's really not the case at all," said Stephen McCrocklin, executive director of the Langsford Learning Acceleration Centers in Louisville. McCrocklin said dyslexia is all in the brain. "We know that people who have dyslexia have a differently designed brain, part of the areas of the language system are just wired differently," McCrocklin said. McCrocklin said students with dyslexia need systematic, intensive and explicit instruction to break through the disorder.