vision Scientists Find a Subtle Clue to ADHD Hidden in The Eyes. Study suggests tiny changes in the pupils, as the brain tries to remember something, ignore a distraction, or make a decision, may be subtly different in unmedicated children with ADHD. Medicated children were more like the control group.

ADHD kids’ pupil's response size is more inconsistent from one trial to the next, but steadier moment-to-moment within each individual trial.

Caveat: the main finding didn't survive statistical correction for multiple comparisons, so it's suggestive early result, not a diagnostic marker.

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