As increasing numbers of diagnoses have made “attention deficit hyperactivity disorder” (ADHD) one of the most common childhood disorders, researchers have wondered if it is being overdiagnosed or misdiagnosed. This question led to the finding that many of the academic and attention-related behaviors associated with ADHD are also present in children suffering from a common eye-teaming problem. “Convergence insufficiency” occurs when the eyes do not work well together to focus on a nearby object. As a result, convergence insufficiency makes printed words blur or seem to move on the page. Consequently, profound reading difficulties may produce hyperactivity that is misinterpreted as ADHD. Children should be tested for convergence insufficiency before accepting an ADHD diagnosis.
P.S. Normally, the eyes’ ability to turn inward together (converge) provides “binocular vision,” which enables the brain to see a single, clearly defined object.