Texas Education Code Definition
Dyslexia means a disorder of constitutional origin manifested by a difficulty in learning to read, write, or spell, despite conventional instruction, adequate intelligence, and sociocultural dysgraphia, and developmental spelling disability. Related disorders includes similar to or related to dyslexia such as developmental auditory imperception, dysphasia, specific developmental dyslexia, developmental dysgraphia, and developmental spelling disability.
International Dyslexia Association Definition:
Dyslexia is 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 consequences may include problems in reading comprehension and reduced reading experience that can impede growth of vocabulary and background knowledge. Adopted by the IDA Board, November 2002. This definition is also used by the National Institutes of Child Health and Human Development (NICHD), 2002.
"For a dyslexic who does not yet know they are dyslexic, life is like a big high wall you never think you will be able to climb or get over. The moment you understand there is something called dyslexia, and there are ways of getting around the problem, the whole world opens up." Sir Jackie Stewart