Although the precise causes of dyslexia are not known as of yet, there are several theories that argue that dyslexia can be an acquired disorder, meaning that another person's negligence could be partially responsible for a child's seemingly developmental learning disorders. Dyslexia, as it is known, is a learner disorder that affects a person's ability to read and write permanently. In general, the disorder has been known to affect all textual encounters, meaning that both words and numbers are affected by dyslexia.