Abstract
The strength of Richardson's historical perspective of dyslexia is that it illuminates some historical antecedents of dyslexia that may be unfamiliar to readers. Its weakness is that it fails to address the definitional issues associated with dyslexia. These issues are addressed in the present article. A definition of dyslexia is offered that considers the nature of the processing limitation that underlies the disorder as well as the developmental changes that occur in the manifestation of the disorder.