Seeing clearly and using your eyes comfortably are two different things. Dr. J.C. Mungar assesses convergence insufficiency, eye teaming and focusing problems in children and adults, the difficulties that glasses alone cannot resolve.
An eye chart measures one thing, how sharply you resolve detail at distance. It says nothing about whether your two eyes point at the same word at the same time, whether they can hold that position through a chapter, or how quickly they shift focus from a whiteboard to a page.
Those are muscular and neurological skills rather than optical ones, and they can be trained. Vision therapy, sometimes called orthoptics, is a structured programme of clinically supervised exercises that retrains the coordination between the eyes and the brain.
The physiotherapy comparison is the useful one. Nobody expects a knee to rehabilitate from a single appointment, and nobody expects a stronger lens to fix a coordination problem. It takes weeks of consistent work, and for the conditions it suits, it works.
Convergence insufficiency is the most common binocular vision disorder and the one vision therapy treats most successfully. It affects roughly one in twenty school aged children, which makes it more common than most conditions parents worry about.
When you look at something close, your eyes turn inward to meet on it. That is convergence, and it is an active muscular effort that has to be sustained for as long as you are reading.
In convergence insufficiency the eyes struggle to hold that inward position. They drift outward, the brain corrects, they drift again. Each correction is small and unconscious, but the accumulated effort across twenty minutes of reading is considerable.
What makes it so easy to miss is that distance vision is entirely unaffected. The eyes only need to converge for near work, so a child with convergence insufficiency sees the board perfectly, passes every school screening, and struggles only when they sit down with a book.
The brain suppresses input from one eye during development, so acuity in that eye stays reduced even with glasses. Patching remains a mainstay, and structured therapy alongside it is often better tolerated, particularly by older children and adults.
One eye points in a different direction from the other, sometimes obviously, often intermittently and most visible when tired. Therapy can improve binocular function and depth perception and helps protect against amblyopia developing.
The focusing system is sluggish, over-active or insufficient, so vision blurs when shifting between distances and near work becomes exhausting. Common in children and increasingly seen in heavy screen users of any age.
Eye movements along a line of text are jerky rather than smooth, causing lost places and skipped words. Frequently mistaken for carelessness or poor reading ability.
The difficulty is not seeing clearly but interpreting accurately. Affects reading fluency, letter and number reversals, spatial judgement and visual memory, and is addressed through perceptual training rather than lenses.
Head injury commonly disrupts eye teaming and focusing, producing headaches, light sensitivity and difficulty reading well after other symptoms have resolved. Assessment establishes what is affected.
A child who cannot sustain reading is usually assessed for everything except their eyes, because their eyes were checked at school and found to be fine.
The screening was probably accurate. It measured distance acuity, and distance acuity is rarely the problem. A binocular vision difficulty produces effort rather than blur, and effort looks like reluctance, poor concentration or slow reading rather than anything anyone would describe as a vision problem.
The pattern worth noticing is task specific. A child who concentrates happily for an hour on something physical but not for ten minutes on a page does not have an attention problem that conveniently appears only around text. Something about the text is harder for them than it is for other children.
None of this means every reading difficulty is visual. Plenty are not. But ruling vision in or out is quick, and it should happen before a child spends another year being taught harder at a problem that is not about teaching. A full children's eye exam is covered by OHIP to age 20 and assesses focusing, teaming and tracking alongside the prescription.
More detailed than the binocular checks within a routine eye exam, and focused on how the two eyes perform together under sustained near demand.
What happens, when, and how long it takes to appear. Reading habits, screen time, school reports and any head injury all matter here.
The prescription is established first, since an uncorrected focusing error can produce identical symptoms and must be ruled out before anything else.
Convergence near point, fusional reserves, eye alignment at distance and near, accommodative accuracy and facility, and how smoothly the eyes track.
Dr. Mungar explains what was measured and what it means, then sets out whether glasses, a therapy programme, monitoring or onward referral is the right answer.
Sometimes the answer is simply a pair of reading glasses, because an uncorrected long sighted prescription was forcing the focusing system to overwork. That is a genuinely good outcome and worth establishing before committing to a therapy programme.
Thorough assessment before any programme Convergence, fusional reserves and accommodative facility are all measured. A therapy plan built on an incomplete picture wastes months.
Experience with children Testing a seven year old on sustained near tasks requires a different approach from testing an adult. Dr. Mungar has examined Oakville children for many years.
Honest about what therapy can do Convergence insufficiency responds well and the evidence is good. Some other conditions respond partially, and a few not at all. You will be told which.
Referral where it is warranted Cases needing intensive in-office therapy or surgical assessment are referred to the right specialist rather than managed here for the sake of it. See his background.
It is a binocular vision disorder in which the eyes struggle to turn inward and stay there during near work. They drift outward and are repeatedly corrected, which makes reading effortful even though distance vision is completely normal.
It affects roughly one in twenty school aged children and is the condition vision therapy treats most successfully.
Yes, and this is the usual situation. A screening tests distance acuity. Convergence and eye teaming are only demanded at near, so a child with convergence insufficiency passes a screening comfortably.
A full eye exam assesses focusing, teaming and tracking as well as the prescription, which is why it catches what a screening cannot.
For convergence insufficiency specifically, the evidence is good and outcomes are generally strong. That is the condition it was most rigorously studied for.
Results are more variable for other conditions, and for some the honest answer is that therapy is not the right tool. We will tell you which category you are in rather than enrolling everyone in a programme.
No. Adults respond too, and often faster, because they can follow instructions precisely and report what they experience. Adult referrals frequently follow a concussion, a period of intensive screen work, or symptoms that have been present for years without explanation.
Typically weeks to a few months rather than a single visit, with exercises done consistently at home between appointments. Convergence insufficiency often improves noticeably within the first several weeks.
Consistency matters more than intensity. Short daily practice produces better results than long sessions done occasionally.
Sometimes, and it is worth checking first. An uncorrected long sighted prescription forces the focusing system to overwork and can produce symptoms indistinguishable from a teaming problem. Correcting it can resolve everything.
Where the difficulty is genuinely convergence rather than refraction, glasses alone will not be enough, though prism lenses are occasionally useful alongside therapy.
The eye exam and binocular vision assessment are covered for anyone under 20, anyone 65 or over, and patients with a qualifying medical condition. Vision therapy programmes themselves are not OHIP funded.
Many extended health plans contribute. Contact your benefits provider before starting and we will supply whatever documentation they need.
No. Optometrists are primary care providers in Ontario, so you can book a binocular vision assessment directly. New patients from across Oakville, Bronte and South Mississauga are welcome.
If reading is effortful, headaches follow homework, or words move on the page, an assessment will establish why. No referral needed. See all services.
