Why Vision Problems After Concussion Are More Common Than You Think

Written by Kaylee Blair, Concussion Specialist & Program Coordinator at NCX Brain Recovery. Clinically reviewed by Nate Pope, Co-Founder / Neuro Occupational Therapist / Clinical Development. Published June 5, 2026 · Last updated June 2026.

Intro

He could see the words on the page just fine. He just couldn’t read them to his daughter anymore.

After his concussion, every bedtime story turned into a headache. The lines seemed to swim. He’d lose his place. Two pages in, he was exhausted and a little nauseous, so he started making excuses to skip it. His eye doctor had told him his vision was 20/20 — so what was going on?

This is only one example of many types of functional vision going awry. If any part of that sounds familiar — words that won’t hold still, screens that wipe you out, a wave of dizziness in a busy grocery store — you might be dealing with one of the most common and most overlooked effects of a concussion: a visual system that’s struggling to keep up. And “20/20” doesn’t rule it out. Here’s why.

WHAT A STANDARD EYE EXAM ACTUALLY MEASURES (AND WHAT IT MISSES)

This is the piece that surprises almost everyone, so it’s worth slowing down on.

A standard eye exam measures visual acuity — how sharply you can see a still letter on a chart, in a quiet room, usually one eye at a time. It’s great at answering one question: do you need glasses to bring that letter into focus?

But that’s a narrow slice of what “vision” really is. A standard exam usually doesn’t check whether your two eyes are working together as a team, whether they can shift focus smoothly between near and far, whether they can track along a line of text without jumping, or whether they can stay coordinated while your head and body are moving through a busy world.

Those are exactly the skills a concussion tends to disrupt. So you can walk out of an eye appointment with a clean “20/20” and still have a visual system that’s genuinely struggling — because the test never looked at the part that’s struggling.

A “SIMPLE” TASK IS NEVER REALLY SIMPLE

Here’s the bigger picture. Almost nothing your brain does happens in isolation — and vision is a perfect example.

Take something as ordinary as reading the sentence you’re reading right now. To make it happen, your two eyes have to aim at the same word together, focus at exactly the right distance, and make a series of quick, precise jumps along the line. Your brain filters out everything in your periphery it doesn’t need, while your balance system quietly keeps your head steady so the words don’t bounce. Then your brain takes all of that raw input and turns it into meaning. Dozens of regions, firing together, in a fraction of a second — for a task you’d call “simple.”

You never notice any of this when it’s working, because it’s automatic. After a concussion, any link in that chain can falter. And because the skill itself was invisible to you, you don’t experience it as “my eye teaming is off” — you just experience reading as suddenly, bafflingly exhausting.

Here’s part of what’s going on under the hood. A concussion can disrupt the brain’s usual, well-worn pathways for these tasks. The brain is remarkably adaptable, so it reroutes — but those alternative pathways aren’t as fast or efficient as the originals. The job still gets done, just with more effort and a slight lag. That’s why so many people describe it not as “I can’t see” but as “things just aren’t the same”: a beat of delay before your eyes focus, a half-second longer to make sense of what you’re looking at, a sense that vision takes work in a way it never used to.

That’s the lens for the rest of this article: the whole brain is involved in seeing, so let’s zoom in on the specific visual skills that tend to break down.

THE VISION SKILLS THAT BREAK DOWN AFTER A CONCUSSION

In plain language, here’s what we see most often:

Eye teaming:

Eye teaming is your two eyes’ ability to work together as a coordinated team — converging (turning inward) to focus on something close, and diverging (turning outward) to focus on something far away — so that what you see stays single, clear, and comfortable. After a concussion, that coordination can slip, which leads to blurry or double or overlapping vision, eye strain, and that “I have to reread every sentence” feeling.

Focusing:

Your eyes constantly shift focus as you look from your laptop or notebook down close, back up to a whiteboard across the room, then back down again — automatically, all day long. When that focusing system is disrupted, those shifts go blurry for a beat and your eyes fatigue quickly. People often describe it this way: “things are blurry at first, but I can eventually make them clear if I really work at it.” So you end up living in a world of intermittent blur — vision that drifts in and out of focus, clear only as long as you keep forcing it.

Tracking and scanning(saccadic eye movement):

Reading a line of text, following a moving ball, scanning a room — these all rely on precise eye movements. After a concussion they can become jumpy or effortful, so you lose your place, skip words, or feel worn out after just a few minutes of reading.

Peripheral awareness and balance:

Vision isn’t just what’s straight ahead — it’s also taking in the edges: the car pulling up beside you, the doorway, the child darting into view. After a concussion, the brain can struggle to process all of that peripheral input. Part of what’s happening is that the brain has trouble sorting what’s an actual threat from what’s harmless background, so every bit of motion at the edges — a passing shopper, a flickering sign, movement in the next aisle — can register as something to react to. That’s exhausting, and it’s part of why busy, cluttered environments suddenly feel so overwhelming.

It also doesn’t stop at vision. Your eyes and your vestibular (inner-ear balance) system are close partners — together they tell your brain where you are in space and keep the world feeling steady as you move. When peripheral processing is overloaded, that partnership gets thrown off too, which is why busy or fast-moving situations can leave you dizzy, unsteady, or queasy, and throw off your sense of space — even when nothing’s physically wrong with your ears.

Symptoms That Don’t Look Like “Vision Problems”

Here’s why this gets missed so often: the symptoms rarely announce themselves as vision issues. Instead, they show up as:

• Headaches, especially with reading or screen time
• Trouble concentrating, or “brain fog” that gets worse as the day goes on
• Feeling drained or foggy after using a computer or phone
• Losing your place when reading, or rereading the same line
• Dizziness or queasiness in busy, visually cluttered places
• Motion sensitivity — riding in a car, scrolling, fast-moving video
• Sensitivity to bright light, glare, or flickering screens
• Feeling anxious or overwhelmed in environments that never used to bother you

That last one matters. Because these symptoms are so easy to misread, people are often told it’s stress, anxiety, or that they just need more rest — when the real driver is a visual system that needs targeted help.

Why Screens Make Everything Worse

If screens have become your enemy, there’s a real reason. A screen asks your visual system to do several demanding jobs at once: hold your eyes teamed at a fixed near distance, keep focus locked in, make hundreds of tiny tracking movements, and process a stream of moving, glowing, sometimes flickering input — all continuously.

For a healthy brain, that’s manageable. For a recovering one, it’s like asking a sprained ankle to run a marathon. The system is already working overtime just to coordinate, and the screen piles on more demand than it can handle right now. The result is the headache, the fog, and the exhaustion that hit after even short stretches of screen time.

This isn’t a sign you’re broken — it’s a sign the system is overloaded and needs to be rebuilt gradually, not pushed through.

The Good News: A Lot Of This Can Get Better

Here’s what we most want you to know: post-concussion vision problems are not something you simply have to “wait out.” Because so much of vision lives in the brain, it responds to the same thing the rest of the brain does — targeted, repeated practice that rebuilds the connections.

At NCX, we address vision as part of our Multi-Sensory Integration Therapy — retraining the eyes and brain to coordinate alongside balance, movement, and cognitive work, because in real life these systems never work in isolation. We’ve often found this whole-system approach resolves a good deal of vision-related symptoms on its own.

Sometimes the visual system needs more focused attention than whole-system work alone provides. For deeper or more complex vision issues, a neuro-optometric evaluation is worth pursuing — and we recommend New Sight Vision Therapy for that specialized vision care. If your concussion symptoms are getting in the way of daily life, a free consultation with us is a no-pressure way to talk through what you’re experiencing and whether our program could be a good fit for you.

June is National Safety Month — a fitting reminder that lingering symptoms after a head injury are worth taking seriously, not brushing off. If something hasn’t felt right since your concussion, that’s reason enough to get a proper look.

Frequently Asked Questions

Sources & Further Reading

• Master CL, Scheiman M, Gallaway M, et al. Vision Diagnoses Are Common After Concussion in Adolescents. Clinical Pediatrics. 2016;55(3):260–267.
• Gallaway M, Scheiman M, Mitchell GL. Vision Therapy for Post-Concussion Vision Disorders. Optometry and Vision Science. 2017;94(1):68–73.

In Closing

If reading, screens, or busy places have felt impossible since your concussion, it’s not all in your head — and it’s not something you simply have to live with. The first step is understanding what’s actually happening, and from there, knowing the right next move. Our team at NCX Brain Recovery can help you do both. Let’s help your brain and your eyes get back on the same team.