Eye-Movement Testing After a Head Injury: What It Measures

If your provider has referred you for eye-movement testing, you might wonder what your eyes have to do with a head injury. Several brain systems control how the eyes track and focus.

What the test involves

You watch targets on a screen while your eye movements are recorded. It does not hurt and needs no injections or contrast.

What it can measure

Tracking smoothness, quick shifts between targets, and focusing. Results are compared against reference ranges and reviewed by a physician alongside other findings.

What it cannot do on its own

No single test diagnoses a concussion. Eye-movement results are one part of a broader assessment.

When it's an emergency

Go to the ER right away for a worsening headache, repeated vomiting, a seizure, weakness, slurred speech, or increasing confusion. Mobile testing is not emergency care.

Braintree Health Partners provides diagnostics only. We diagnose. You treat.

Ask your provider to refer you: providers use /referral or call 813-709-3771.

Why the eyes are a window into brain function

Moving your eyes smoothly to follow a target, or jumping quickly from one point to another, takes precise coordination among many brain regions. Because so much of the brain is involved, problems in that network can show up as subtle changes in eye movement, even when a person feels they are "seeing fine." That's why eye-movement assessment is often part of an evaluation after a head injury.

What the test is like

The patient sits comfortably and watches a screen or follows a moving target while a recording system tracks their eye movements. Typical tasks include following a dot smoothly, jumping their gaze between targets, and holding steady fixation. Nothing touches the eye, and there are no drops or bright flashes. Most people find it easy, though some with light sensitivity find screens tiring, and the technician can pause if needed. Patients who wear glasses or contacts should bring them.

What the results describe

The recording yields measurements such as how accurately the eyes stay on a moving target, how quickly they start moving, and whether both eyes move together. Those measures are compared with reference data. The reviewing physician reads them in context, together with neurocognitive results, brain-activity findings, and the symptom history. One abnormal number doesn't establish a diagnosis, and a normal result doesn't rule one out. The interpretation looks at the whole picture.

Why patients notice eye-related symptoms

Many patients after a crash report symptoms they don't connect to their eyes: losing their place while reading, getting carsick, feeling worse in busy stores, or tiring quickly at a computer. These everyday complaints are worth reporting, because they may relate to how the eyes and brain are working together. Measured findings may support a referral to a specialist, such as a vision or vestibular therapist, which the treating provider decides on.

Where the test fits in Braintree's process

Eye-movement assessment is one part of a broader mobile evaluation carried out at the treating provider's office. A physician reviews all of the results together, and the report goes to the referring provider. We diagnose. You treat.

Emergency warning signs

Sudden double vision, loss of vision, a severe worsening headache, repeated vomiting, or new weakness need emergency care. Call 911.

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