s a learning disorder that involves difficulty reading due to problems identifying speech sounds and learning how they relate to letters and words (decoding). Also called reading disability, dyslexia affects areas of the brain that process language

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It is possible for a dyslexic person to be able to read very well, yet find it extremely difficult or impossible to write or spell. ... It is important to understand that when a dyslexic person “sees” letters or words reversed or mixed up, there is usually nothing wrong with her eyes.

Phonological Dyslexia.
Surface Dyslexia.
Rapid Automatic Naming Dyslexia.
Double Deficit Dyslexia.
Dyscalculia.
Dysgraphia.
Left Right Confusion

It is thought to be caused by impairment in the brain's ability to process phonemes (the smallest units of speech that make words different from each other). It does not result from vision or hearing problems. It is not due to mental retardation, brain damage, or a lack of intelligence.