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This article is about developmental dyslexia. For acquired dyslexia, see Alexia (disorder).
Dyslexia is considered to be a learning disability. It manifests primarily as a difficulty with written language, particularly with reading and spelling. It is separate and distinct from reading difficulties resulting from other causes, such as a non-neurological deficiency with vision or hearing, or from poor or inadequate reading instruction. Evidence also suggests that dyslexia results from differences in how the brain processes written and/or spoken language. Although dyslexia is allegedly the result of a neurological difference, it is not an intellectual disability. Dyslexia has been diagnosed in people possessing all levels of intelligence.
The word dyslexia comes from the Greek words δυσ- dys- ("impaired") and λέξις lexis ("word"). People with dyslexia are called dyslexic