Ask most people what a brain injury looks like, and they’ll describe a headache, maybe some confusion, maybe a loss of consciousness. Far fewer would think to mention trouble tracking a moving object with their eyes, or unsteadiness on a soft surface. But some of the most consistent, measurable signs of mild traumatic brain injury show up in exactly those systems–vision and balance–and researchers have built increasingly precise ways to test for them.
Why vision and balance are so often affected
The vestibular system, centered in the inner ear and brainstem, is responsible for your sense of balance and spatial orientation. The brainstem also houses the cranial nerves that control eye movement. Both structures sit in a part of the brain that’s mechanically vulnerable to the twisting and shearing forces generated in a car crash, fall, or blow to the head–regardless of which direction the impact came from. Because the vestibular nuclei project directly to the cortex, disruption in this region can produce measurable downstream effects on cognition and coordination, not just dizziness.
What the research shows
A study published in PLOS ONE evaluated a battery of oculomotor (eye-tracking), vestibular, and reaction-time tests in patients with mild TBI compared to healthy controls. The combined battery achieved 89% sensitivity and 97.5% specificity in distinguishing concussed patients from controls–a notably strong result for an assessment that doesn’t require any pre-injury baseline data and can be administered without specialized imaging equipment.
Vestibular/Ocular-Motor Screening (VOMS), a related and now widely studied clinical tool, has consistently shown high sensitivity in detecting concussion-related deficits, and a systematic review of the recovery literature found that a positive VOMS result reliably predicts a longer recovery timeline–making it useful not just for diagnosis, but for setting realistic expectations about the road ahead.
Balance testing (posturography) shows a similar pattern. Persistent dizziness and balance impairment are common after mild-to-moderate TBI–affecting roughly a quarter of patients even a full year after injury–and, unlike a straightforward musculoskeletal injury, these symptoms don’t reliably resolve just with time and rest.
Why this matters diagnostically
These findings matter for two connected reasons. First, they give clinicians a way to detect functional impairment even when standard neurological exams and conventional imaging come back clean–vestibular and oculomotor deficits are objectively measurable, which sets them apart from symptoms that rely purely on patient self-report. Second, because a large share of people with brain injury show measurable deficits on this kind of testing (estimates in the literature range widely depending on the specific battery and population studied, but abnormalities are common), it adds a genuinely independent line of evidence to a diagnostic picture that too often rests on imaging alone.
The caveat worth keeping in mind
Vestibular and oculomotor testing is prognostic and diagnostic, but it isn’t infallible, and it isn’t purely objective in the way a blood test is–administration technique, patient effort, and pre-existing vision or inner-ear conditions can all affect results. The strongest use of this testing, based on the current research, is as one component of a broader assessment battery rather than a stand-alone diagnostic tool.
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Sources: Oculomotor, Vestibular, and Reaction Time Tests in Mild TBI, PLOS ONE; The Ability of Vestibular and Oculomotor Screenings to Predict Recovery, PMC; Exploring VOMS in Adults with Persistent Complaints after mTBI, PMC; Dizziness-Related Disability One Year after Mild-to-Moderate TBI, PMC
