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Does Visual Therapy Improve Reading Scores in Children With Convergence Insufficiency?

In a trial of 310 children with symptomatic convergence insufficiency, visual therapy didn't improve standardized reading scores more than placebo after 16 weeks. The condition makes it hard for the eyes to work together up close. Children who received active therapy improved more on eye coordination tests, while the difference in reading comprehension scores was small and could have occurred by chance.

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Does Visual Therapy Improve Reading Scores in Children With Convergence Insufficiency?

In a trial of 310 children with symptomatic convergence insufficiency, visual therapy didn't improve standardized reading scores more than placebo after 16 weeks. The condition makes it hard for the eyes to work together up close. Children who received active therapy improved more on eye coordination tests, while the difference in reading comprehension scores was small and could have occurred by chance.

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Which Reading Skills Did the Trial Measure?

The trial primarily measured how well children understood what they read. Average comprehension scores rose by 3.68 points with active therapy and 3.80 points with placebo on the same standardized test. The trial also measured how well children read familiar words, sounded out made-up words, and read aloud. None of those tests showed a clear advantage for active therapy. A later analysis that excluded children who didn't meet all eligibility criteria reached the same conclusion about reading comprehension.

What Changed on Eye Coordination Tests?

Children who received active therapy could keep a target single at a closer distance than children in the placebo group, on average. An examiner measured the distance at which the eyes stopped working together to keep a nearby target single. That distance shortened by an average of 10.4 centimeters with active therapy and 6.2 centimeters with placebo. Children who received active therapy also improved more on a separate test that measured how well their eyes maintained a single image while looking through a prism.

Did Children Report Fewer Symptoms During Near Work?

Yes, children in both groups reported fewer symptoms, and the difference between groups could have occurred by chance. Average symptom survey scores fell by 11.8 points with active therapy and 10.4 points with placebo. Lower scores mean children reported fewer or less frequent problems. The survey asked about symptoms during reading and other close work, including tired eyes and double vision. It captured what children felt during those tasks, while the reading tests measured how they performed.

How Does Supervised Visual Therapy Compare With Home Exercises Alone?

Children who had office-based visual therapy with home practice were more likely to meet clinical eye coordination goals than children assigned home exercises alone. In a review of trials, children on the combined program were 2.86 times as likely to meet the goals as children assigned pencil or target push-ups at home. A separate home-only trial found no clear advantage for computer exercises over placebo exercises. That trial enrolled fewer children than planned, so the comparison remains uncertain.

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What Ages Did the Reading Trial Include?

The reading trial enrolled children ages 9 to 14 with symptomatic convergence insufficiency. It didn't compare starting ages, so it can't tell us the best age to begin therapy.

What Did a Visual Therapy Session Involve?

Children practiced tasks that trained their eyes to turn inward together and focus on nearby targets. The trial scheduled one 60-minute office session a week and prescribed 15 minutes of home practice on five days each week.

Did the Trial Study Visual Therapy as a Treatment for Dyslexia?

No. The trial enrolled children with symptomatic convergence insufficiency and excluded children who scored below its cutoff on a word-reading screening test. It didn't test visual therapy as a treatment for dyslexia.

When to See Your Doctor

Talk to an eye doctor if your child often sees double, gets headaches, or has tired eyes during reading or other close work. Tell the doctor when the symptoms occur and how often your child notices them. The doctor can check how well your child's eyes work together up close, even if your child reads an eye chart clearly.

References

Cochrane Database of Systematic Reviews. Interventions for convergence insufficiency: a network meta-analysis. https://doi.org/10.1002/14651858.CD006768.pub3. Published December 2, 2020. Accessed November 10, 2026.

National Eye Institute. Convergence Insufficiency. https://www.nei.nih.gov/eye-health-information/eye-conditions-and-diseases/convergence-insufficiency. Updated December 4, 2024. Accessed November 10, 2026.

Optometry and Vision Science. Effect of Vergence/Accommodative Therapy on Reading in Children with Convergence Insufficiency: A Randomized Clinical Trial. https://doi.org/10.1097/OPX.0000000000001442. Published November 2019. Accessed November 10, 2026.

Optometry and Vision Science. Erratum. https://doi.org/10.1097/OPX.0000000000001935. Published November 2022. Accessed November 10, 2026.

Optometry and Vision Science. Home-Based Therapy for Symptomatic Convergence Insufficiency in Children: A Randomized Clinical Trial. https://doi.org/10.1097/OPX.0000000000000975. Published December 2016. Accessed November 10, 2026.

Optometry and Vision Science. Treatment of Symptomatic Convergence Insufficiency in Children Enrolled in the Convergence Insufficiency Treatment Trial?Attention & Reading Trial: A Randomized Clinical Trial. https://doi.org/10.1097/OPX.0000000000001443. Published November 2019. Accessed November 10, 2026.