Over the course of my career, I have mentored teachers, advised parents, and instructed students that ADHD is not a reading disability. And, while the name is all wrong (it is not a deficit of attention), it has to do with variable attention, especially having to do with interest levels, not reading. A different part of the brain, I say. Not really impacting decoding or encoding of words. More having to do with executive functions and impulsivity.
But, in fact, ADHD can severely hamper reading in the same way it interferes with other interactions where a brain loses interest. Students reading large amounts of “boring” text such as in a high school or college textbook may struggle to maintain focus and thus, may not comprehend the reading material. Many people with ADHD do not read a lot, especially when it comes to less interesting material. This can be a problem. As I have repeated frequently, reading, in its most basic form is a technology to learn information. People who do not read need to use other technologies to learn information. Audio assisted reading is a good work around for this issue.