Every child who comes in with an ADHD diagnosis or suspected ADHD alongside a vision concern gets worked through the same basic reasoning process, even though the specifics differ case by case.

Question One: Is It Task-Specific or Global?

This is where I start, every time. I want to know whether the inattention, avoidance, or restlessness is confined to sustained near work, or whether it shows up consistently across settings — homework, play, sports, conversation, unstructured time. A child who reads distractibly but plays for hours with full attention is showing a pattern that argues for a visual driver. A child who's inattentive everywhere, regardless of the task's visual demand, is showing a pattern more consistent with a primary attention deficit, since DSM-5 criteria for ADHD specifically require cross-setting presence.

Question Two: What Does the Testing Actually Show?

Task specificity narrows the differential; it doesn't replace testing. A full binocular vision evaluation — near point of convergence, accommodative facility, vergence ranges — either confirms or rules out a visual contributor regardless of how convincing the symptom pattern looked going in. I've seen cases where the history strongly suggested a visual driver and testing came back essentially clean, and cases where an existing ADHD diagnosis seemed to explain everything until testing revealed a significant, previously untested convergence insufficiency.

Question Three: Has Anything Actually Been Tried, and What Happened?

Response to intervention is itself informative. A child already on ADHD medication whose near-work-specific symptoms haven't budged despite otherwise-effective medication is showing you something — the medication is addressing whatever it's addressing, and the reading-specific complaint is very likely coming from somewhere else. Conversely, a child who improves globally on medication probably doesn't have a major untreated visual component driving the bulk of the picture, even if minor findings exist.

When the Answer Is Genuinely Both

The most common outcome in ambiguous cases isn't a clean either/or — it's real comorbidity. A child can have ADHD that genuinely benefits from appropriate management and a vision-based learning problem that genuinely benefits from vision therapy, simultaneously, with each addressing a different piece of the same struggling-reader picture. I don't treat finding one diagnosis as a reason to stop looking for the other, and I tell parents directly that both can be true — the goal is a complete picture, not the simplest possible explanation.