“Dyslexia is a specific learning disability characterized by difficulties in word reading and/or spelling that involve accuracy, speed, or both and vary depending on the orthography. These difficulties occur along a continuum of severity and persist even with instruction that is effective for the individual’s peers. The causes of dyslexia are complex and involve combinations of genetic, neurobiological, and environmental influences that interact throughout development. Underlying difficulties with phonological and morphological processing are common but not universal, and early oral language weaknesses often foreshadow literacy challenges. Secondary consequences include reading comprehension problems and reduced reading and writing experience that can impede growth in language, knowledge, written expression, and overall academic achievement. Psychological well-being and employment opportunities also may be affected. Although identification and targeted instruction are important at any age, language and literacy support before and during the early years of education is particularly effective.”
IDA Board of Directors
Adopted by the IDA Board of Directors in 2025. This new definition is also used by the National Institute of Child Health and Human Development (NICHD). Many state education codes, including New Jersey, Ohio and Utah, have adopted this definition.
For excellent information in Colorado including a Dyslexia Fact Sheet and Handbook click here:
Definition of Dyslexia
