My child sees 20/20. How can vision be the problem?

Sharpness and teaming are different skills. CI is a teaming problem that appears only up close, where school lives.

Do adults get convergence insufficiency?

Yes — long screen days expose it. Strain, headaches and doubling text are the tells.

How long does therapy take?

Plans are structured over weeks with measurable checkpoints — improvement is tracked, not assumed.

What causes convergence insufficiency?

Often no single cause is found; the nerves and muscles that turn the eyes inward simply do not coordinate well up close. It usually starts in childhood, and it is common after a concussion or other brain injury at any age.

What does convergence insufficiency look like?

From the outside, usually nothing; at most, one eye drifts outward during close work. What families notice is behavior: words blurring or doubling, losing the place, covering one eye to read, headaches after homework, and avoiding reading altogether. A cover test and near-point measurements make it visible in the exam room.

Can convergence insufficiency be cured?

It is one of the most treatable binocular vision problems. In the NEI-funded Convergence Insufficiency Treatment Trial, 12 weeks of office-based vision therapy with home reinforcement left about three in four children symptom-free or improved, more than home exercises alone achieved. Gains generally hold, with occasional maintenance.

Medically reviewed by Dr. Kevin Cohenmehr, OD Last reviewed October 24, 2026

Convergence Insufficiency: Symptoms, Causes & Treatment

Perfect distance vision. Miserable reading.

Reading asks both eyes to rotate inward and hold that aim for minutes at a time. In convergence insufficiency they can’t sustain it: words blur, double or swim, heads ache, and attention drains. The distance chart reads 20/20 — which is exactly why it gets missed.

Book appointmentOr call 310-828-2010 Accepted insurance

Problem: Eyes tire of teaming up close
Chart result: Often a perfect 20/20
Found by: Near-teaming measurements
Treated by: Vision therapy, prism

The homework pattern

Words blurring, doubling or “moving” after minutes of reading
Losing their place; re-reading lines
Headaches around the eyes or forehead with near work
Covering one eye, or short bursts then avoidance
Comprehension that collapses on paper but not out loud

Why screenings miss it

School screenings and even standard exams measure one eye at a time at distance. Convergence is a two-eyes-together, up-close skill — it has to be tested that way.

Vision therapy →

Treatment

A trainable skill.

Convergence is one of the most treatable binocular problems. Doctor-directed vision therapy builds the stamina and precision of near teaming; prism reading glasses can bridge comfort while skills develop. Dr. Kevin Cohenmehr leads this work at Cohenmehr Optometry, including with children whose learning struggles turned out to be visual.

Worth testing

Before the tutor, test the teaming.

A near-vision evaluation measures convergence directly
Therapy plans are structured and finite
Adults with screen-day strain benefit too

Book a near-vision evaluation

Common questions

Convergence insufficiency, answered.

Anything else, call the office at 310-828-2010.

Sharpness and teaming are different skills. CI is a teaming problem that appears only up close, where school lives.
Yes — long screen days expose it. Strain, headaches and doubling text are the tells.
Plans are structured over weeks with measurable checkpoints — improvement is tracked, not assumed.
Often no single cause is found; the nerves and muscles that turn the eyes inward simply do not coordinate well up close. It usually starts in childhood, and it is common after a concussion or other brain injury at any age.
From the outside, usually nothing; at most, one eye drifts outward during close work. What families notice is behavior: words blurring or doubling, losing the place, covering one eye to read, headaches after homework, and avoiding reading altogether. A cover test and near-point measurements make it visible in the exam room.
It is one of the most treatable binocular vision problems. In the NEI-funded Convergence Insufficiency Treatment Trial, 12 weeks of office-based vision therapy with home reinforcement left about three in four children symptom-free or improved, more than home exercises alone achieved. Gains generally hold, with occasional maintenance.

Also consider

Next step

Reading shouldn’t cost this much effort.

Book an evaluation that tests both eyes working together, up close.

Book Today Or call 310-828-2010