Dyslexia is clinically referred to as a reading disorder. It refers to the inability to read at an age-appropriate level, in spite of the opportunities to learn how to read and the physical ability to learn how to read. The core problem of dyslexia is difficulties with phonemic awareness. That refers to the processing of phonemes. Phonemes are the correspondence between the letter and it's sound. Most people think that dyslexia refers to letter reversals. That is something that we seen commonly in young children who are learning to write and is developmentally something that is common until First Grade. So just because a child reverses their letters or numbers, doesn't mean they have dyslexia.