Dyslexia is the most common of all the known learning disabilities, affecting one out of five children in the United States and accounting for 80% of those diagnosed with a learning disability. This reading disorder, which is sometimes referred to as developmental dyslexia, is characterized by difficulty in learning to read and spell despite conventional instruction and adequate intelligence. It is neurologically based and often familial; that is, it tends to run in families, which suggests that it is genetically founded and inherited. This entry further describes dyslexia and how it is diagnosed, then discusses reading measures used in a dyslexia diagnosis, other areas that are evaluated when diagnosing dyslexia, and models of assessment for dyslexia.

The vast majority of people with dyslexia are not diagnosed ...

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