Dyslexia describes a different king of mind, often gifted and productive, that learns differently. Dyslexia is not the result of low intelligence.  Intelligence is not the problem.  An unexpected gap exists between learning aptitude and achievement in school.  The problem is not behavioral, psychological, motivational or social.  It is not a problem of vision;  people with dyslexia do not "see backward."  Dyslexia results from differences in the structure and function of the brain.   
(Information provided by the Austin Branch of the International Dyslexia Association)