As an ADHD-affected person myself, the above resonates strongly with me as a description of its symptoms, and indeed of my thoughts regarding ADHD itself. I hav

As an ADHD-affected person myself, the above resonates strongly with me as a description of its symptoms, and indeed of my thoughts regarding ADHD itself. I have been on ADHD medication (first Ritalin, then Concerta; both use methylphenidate as their active ingredient, as opposed to Adderall) for over a decade now, and have suffered negligible ill effects. One thing in particular I'd like to note is that my dosage has steadily decreased over the years, not just because my symptoms have become less severe, but because I have noticed there is a certain "threshold" dosage - not just of methylphenidate, but of stimulants in general - beyond which the effects of further medication or stimulants on me change. This change is not a complete reversal; a stimulant is still a stimulant. But up to this threshold, stimulants aid my ability to resist impulses and concentrate on things I may not be interested in, while beyond it, they make me hyperactive and give me the jitters without significantly aiding my concentration. Furthering the vision analogy, this threshold seems to me the logical equivalent of 20/20 vision. This threshold dosage has itself been steadily decreasing. (My actual vision, on the other hand, has been steadily getting worse.)