Motion Sickness and Dizziness: Is It a Vision Problem?

Does your child get carsick on a fifteen-minute drive? Feel unsteady in a crowded grocery aisle? Complain that swings, escalators, or scrolling on a tablet turns their stomach?

Most families file motion sickness under “sensitive stomach.” Sometimes it starts higher up, in how the eyes and the balance system share information. Here is what that connection actually is, what the research does and does not support, and when the first call should be your pediatrician rather than an eye doctor.

Key takeaways

• Motion sickness happens when the eyes, the inner ear, and the body send the brain signals that disagree (Bertolini & Straumann, 2016).
• In children referred to balance clinics for dizziness, eye problems account for a minority of cases, but that minority often improves after eye care (Anoh-Tanon et al., 2000; Wiener-Vacher et al., 2019).
• Larger vertical eye misalignment goes along with more motion sickness in the laboratory, yet the researchers concluded the relationship may not be causal (Jackson & Bedell, 2012).
• No placebo-controlled trial has tested vision therapy for motion sickness. Its best-supported use is symptomatic convergence insufficiency, where one large trial beat placebo on symptoms (CITT, 2008) and a later, larger one did not (CITT-ART, 2019).
• Sudden vertigo, hearing changes, repeated vomiting, or dizziness after a head injury need medical evaluation first.

How vision and balance work together

Three systems tell the brain where you are and how you are moving: vision, the vestibular system in the inner ear, and proprioception, the feedback from muscles and joints. When the three agree, movement feels unremarkable.

Motion sickness appears when they disagree. The leading explanation is sensory conflict: symptoms arise when motion-sensitive signals contradict each other, or contradict what the brain expected (Bertolini & Straumann, 2016). That is why reading in a moving car is the classic trigger. The inner ear reports motion; the eyes, locked on a page, report stillness. It works in reverse too: the same review notes that illusions of self-motion produced by moving visual surroundings can cause sickness with no physical movement at all, so a wide screen or a busy store can be enough.

Now add an eye-teaming problem. If the two eyes do not aim at the same point easily, the visual half of the equation becomes noisier and harder for the brain to trust. That is the mechanism we look for at Vision & Learning Center, and it is why we test eye teaming, focusing, and tracking rather than acuity alone.

Signs your child’s motion sickness may be vision-related

• Gets carsick quickly, especially while reading or watching a screen in the car
• Loses focus or feels sick when the world is moving, such as on a swing or merry-go-round
• Avoids playground equipment, escalators, or fast-moving sports
• Feels dizzy or nauseated in visually busy places like stores, gyms, and malls
• Also reports eye strain, headaches after homework, double vision, or covers one eye

None of these confirms a vision problem. They are reasons to have eye teaming checked.

Dizziness that is worse in visually complex settings is a recognized pattern in its own right. The international criteria for persistent postural-perceptual dizziness list “exposure to moving visual stimuli or complex visual patterns” as one of three defining aggravating factors (Staab et al., 2017). We describe that experience in anxiety or discomfort in crowded or visually complex environments, and the wider picture in our guide to binocular vision dysfunction.

What the research actually shows

Eyes explain a minority of dizzy children, and that minority often improves

Of 523 children referred for vestibular testing because of vertigo or disequilibrium, 27 had normal vestibular and neurologic examinations but did have ocular disorders, most often vergence insufficiency or latent strabismus (70%) and anisometropia (41%). Treating the eye condition resolved symptoms in roughly two-thirds of them, which led the authors to argue that not every dizzy child needs an MRI (Anoh-Tanon et al., 2000).

A later prospective study looked at 179 children referred for vertigo or dizziness whose only abnormal finding after full ear and neurological testing was an eye problem. Sixty-nine of them had vergence insufficiency, and 49 enrolled in treatment. After orthoptic vergence training plus advice to reduce screen time, vertigo symptoms had disappeared in all of the patients at three months, and the gains remained stable or continued at nine months (Wiener-Vacher et al., 2019).

Read together, the honest conclusion is narrow but useful. Eye problems are not the usual cause of childhood dizziness, but they are a real and treatable cause in a meaningful minority, and they are easy to miss because an inner-ear workup does not test them. The second study had no placebo group, and the 109 healthy children it compared against were an untreated normative group rather than a placebo arm, so natural recovery and expectation cannot be ruled out.

Vertical eye misalignment and motion sickness: a link, not a proven cause

Vertical heterophoria is a small tendency for one eye to sit higher than the other. Online it is often described as a cause of dizziness. The experimental data are more cautious. One study tested 43 adults who had no eye complaints. Each of them read inside a rotating optokinetic drum (a striped cylinder spun around the subject to simulate a moving visual world). The larger the vertical misalignment, the sicker they felt. Even a very small vertical misalignment separated the low-symptom from the high-symptom subjects. The investigators then used prism lenses to change that misalignment. Symptoms shifted in only 1 of 12 subjects with small misalignments, and in 2 of 4 with larger ones. The authors concluded that the association may not be causal (Jackson & Bedell, 2012).

The prism-treatment evidence is weak by design. Two look-back reviews of past charts come from the same private practice, and neither had a comparison group. The first reported a 71.8% drop in symptom burden in 43 patients with traumatic brain injury (Doble et al., 2010). The second reported reductions of 19% to 61% on headache, dizziness and anxiety measures in 38 post-concussion patients (Rosner et al., 2016). Encouraging, but unmasked and not independently replicated. We treat vertical heterophoria as a finding worth measuring, not a proven explanation for every dizzy patient.

After a concussion, vision and balance problems travel together

Among 101 young athletes referred to a concussion program, 28.6% of those with acute concussion had vestibulo-ocular dysfunction — trouble holding the eyes steady while the head moves. Among those with post-concussion syndrome, it was 62.5% (Ellis et al., 2015). The joint clinical report from the American Academy of Pediatrics and the ophthalmology societies adds an important qualifier. Most children recover on their own within about four weeks. It is those who do not who warrant a vision-specific examination of the vestibulo-ocular reflex, the near point of convergence and focusing (Master et al., 2022).

What vision therapy can and cannot promise

What the evidence supports. Office-based vergence and accommodative therapy is the best-supported treatment for symptomatic convergence insufficiency in children. In the 221-child Convergence Insufficiency Treatment Trial, 73% of the office-therapy group were successful or improved at 12 weeks versus 35% with an office placebo (CITT, 2008), and a Cochrane network meta-analysis of 12 trials and 1,289 participants confirmed the advantage over placebo in children (Scheiman et al., 2020). The picture is not one-sided, though. The larger follow-up trial, CITT-ART, found that the eye-teaming signs improved more with therapy than with placebo, while self-reported symptom scores improved about as much in both groups (CITT-ART, 2019). Since dizziness and nausea are symptoms, that caveat matters here.

What it does not show. Those trials measured eye-teaming symptoms, not motion sickness. No randomized, placebo-controlled trial has tested office-based vergence and accommodative vision therapy for motion sickness or dizziness. Vision therapy also cannot treat inner-ear disease, migraine, low blood pressure, anemia, or anxiety, and it is not a substitute for a medical workup.

Our clinical perspective. When we find and treat a measurable binocular vision problem in a child who is also motion sensitive, families often report that busy environments and car rides get easier. We share that because it is what we see in the office, not because a trial has proven it.

When to start with a doctor instead

Call your pediatrician, an ENT, or neurology first if your child has spinning vertigo, hearing loss or ringing, ear pain or drainage, repeated vomiting, fainting, headache with weakness or numbness, worsening unsteadiness, or any dizziness that began after a head injury. A binocular vision exam is the sensible next step once that workup is normal and dizziness persists, or when symptoms cluster around reading, screens, and visually busy places. Our page on dizziness walks through the overlap.

What parents can do this week

• Keep a short log: when symptoms happen, how long they last, and what the eyes were doing at the time
• Watch the horizon in the car, and skip reading or screens while moving
• Reduce sustained close screen work, which was part of the treatment in the study above
• Mention any history of head injury, and ask for a full binocular vision assessment rather than an acuity screening

Motion sickness is not always about the stomach, and it is not always about the eyes either. The useful question is whether an eye-teaming or focusing problem is adding to the mismatch, because that part is measurable and often treatable. If this sounds like your child, schedule a comprehensive developmental vision evaluation and we will tell you honestly what we find — or Schedule an evaluation online at our Boynton Beach or Boca Raton office.