Jamie Martin, Assistive Technology Consultant for Students and Adults with Dyslexia
The term "dyslexia" refers to a brain-based learning disability that affects people's language skills. Dyslexic students and adults may have difficulty reading, writing, and spelling, but this is by no means a reflection of their intelligence. Dyslexia affects different people in different ways. Some can have mild dyslexia, and others can have severe dyslexia. Researches have tried to categorize the subtypes in order to explain the different ways that dyslexics struggle with language.
To better understand what dyslexia is and is not, here is a great overview: Understanding Dyslexia
For more information on how some people categorize dyslexia, here is a clear explanation: Different Types of Dyslexia
The language deficits that people have can change over time, especially if they have intensive remedial instruction. Several remedial programs are based on the Orton-Gillingham approach and can go a long way towards improving reading and writing. Language-based activities can also be made easier through the use of assistive technology.