The Research Committee of the International Dyslexia Association defines dyslexia as:
'… a specific learning disability that is neurobiological in origin. It is characterized by difficulties with accurate and/or fluent word recognition and by poor spelling and decoding abilities. These difficulties typically result from a deficit in the phonological component of language that is often unexpected in relation to other cognitive abilities and the provision of effective classroom instruction. Secondary problems may include problems in reading comprehension and reduced reading experience that can impede growth of vocabulary and background knowledge.'
Dyslexia is sometimes referred to as a Learning disability, Specific Learning Difficulty, (SpLD), Reading Disorder or Reading Disability.
For dyslexia support please visit this page: http://www.adhdguide.com.au/dyslexia-support/