The definition of dyslexia according to Critchley (1970) is the difficulty in reading, writing, and spelling (disotografi), in the absence of peripheral sensory disturbances. In the sense of not having weakness in hearing, vision, intelligence, emotional primer or environment less support. Dyslexia is a condition of learning disability in a person caused by difficulty in that person in performing reading and writing activities. Although having trouble writing letters and of course learning difficulties, does not mean dyslexia is an intellectual disability. In addition to affecting the ability to compose sentences, read and write, dyslexia also affects the ability to speak on some pengidapnya. While the development of standard capability remains normal, such as intelligence, analytical ability and sensory power in the sense of taste. Characteristics of Dyslexic Patients Having trouble learning the names of objects and sounds of letters. Spelling ability is inconsistent a