Identifying, Assessing, and Treating Dyslexia - Hardcoverby Aria Harris (Editor) Dyslexia is a learning disorder which is characterized by difficulty in reading due to problems with identifying speech sounds and learning to relate letters and words (decoding). Dyslexia is of two types, namely, developmental dyslexia and acquired dyslexia. Developmental dyslexia is used to describe an unanticipated difficulty in reading in children and adults who otherwise possess motivation, intelligence, and schooling