Carsickness Is Common, But It Isn’t Normal

Why Motion Sickness May Be a Sign of an Underlying Vision Problem

“I’ve never been able to read in the car.”

It’s one of the most common comments we hear in clinic. Many people assume that carsickness is simply something they inherited or that they’ll “grow out of.” Others learn to avoid reading, looking at their phone, or even riding in the passenger seat altogether.

While occasional motion sickness can happen to anyone, persistent carsickness is not something you should simply accept. In many cases, it may be a sign that your brain is struggling to coordinate information from your eyes, inner ears, and neck.

The good news? Many of these problems are treatable.

Motion Sickness Is More Than an Inner Ear Problem

Most people think motion sickness is caused solely by the inner ear. While the vestibular system (the balance organs in your inner ear) certainly plays an important role, it is only one part of a much larger system.

Your brain constantly integrates information from three major systems:

• Your eyes, which tell you where you are looking and how the world around you is moving.

• Your vestibular system, which detects head movement and acceleration.

• Your cervical proprioceptive system, which consists of sensors in the muscles and joints of your neck that tell your brain where your head is positioned relative to your body.

Together, these three systems continuously communicate to keep your vision clear, maintain balance, and help you understand where your body is in space.

When these systems agree, movement feels effortless.

When they don’t, your brain experiences what scientists call sensory conflict—and that conflict can produce nausea, dizziness, headaches, eye strain, and motion sickness.

Why Reading in the Car Is So Difficult

Reading in a moving vehicle is one of the most demanding visual tasks your brain can perform.

As a passenger, your eyes are trying to:

• Maintain clear focus on nearby text

• Keep both eyes aligned on the page

• Track each line accurately despite the car and book being in motion

• Ignore constantly moving scenery outside the window

• Compensate for bumps, turns, and acceleration

Meanwhile, your vestibular system detects every movement of the vehicle, while your neck continuously provides information about the position of your head.

If any part of this system isn’t working efficiently, your brain has to work much harder to keep everything synchronized.

The result? Nausea, dizziness, headaches, blurred vision, and the feeling that you need to put the book—or your phone—away.

Vision Problems That Can Contribute to Carsickness

Many people are surprised to learn that vision problems can contribute to motion sickness—even if they see 20/20.

Some of the most common include:

Accommodative Dysfunction

Difficulty focusing up close, tendency to over-focus up close (accommodative spasm) or inability to rapidly changing focus between near and far objects.

Symptoms may include:

• Blurry vision/carsickness while reading

• Eye strain/Headaches when focusing

• Difficulty using a phone in the car

• Blur far away after looking up close for awhile

• Difficulty driving on windy roads or over bridges

Binocular Vision Disorders (BVD)

Even small problems with eye alignment can make it difficult for the brain to combine images from both eyes comfortably.

Patients often report:

• Double vision or blurred/overlapping vision

• Reading fatigue

• Motion sensitivity

• Difficulty riding as a passenger

Eye Movement Disorders

Your eyes must make thousands of precise movements every day.

Difficulty with:

• saccades (jumping between targets)

• smooth pursuits (tracking moving objects)

• gaze stabilization

can increase visual effort and make motion sickness significantly worse.

Who Is Most at Risk?

Persistent carsickness is more common in people with:

• Concussion or traumatic brain injury

• Whiplash injuries

• Migraine

• Vestibular disorders

• Binocular vision dysfunction (BVD)

• Genetic/Familial history of carsickness

• Persistent dizziness or visual motion sensitivity

Children are also particularly susceptible, especially between 7 and 12 years of age.

Questions You Should Ask Yourself

If you answer “yes” to several of these questions, a comprehensive binocular vision evaluation may be beneficial.

• Do you get nauseated/dizzy when reading in the car?

• Can you use your phone as a passenger?

• Do grocery stores or busy environments make you uncomfortable?

• Do winding roads make you feel worse?

• Did your symptoms begin after a concussion or whiplash injury?

• Do you experience headaches or dizziness while traveling?

Treatment Often Requires a Team Approach

Because carsickness can involve multiple systems, treatment is often most successful when providers work together.

Depending on the underlying cause, treatment may include:

Neuro-Optometric Rehabilitation

Vision therapy can improve:

• focusing

• eye teaming

• eye movement control

• visual motion tolerance

Vestibular Physical Therapy

Vestibular rehabilitation can help improve:

• gaze stabilization

• balance

• adaptation to motion

• dizziness

Cervical Physical Therapy

The neck plays an important role in balance and spatial awareness.

Treating cervical dysfunction can improve:

• neck pain

• dizziness

• head position awareness

• visual stability

Don’t Ignore Persistent Carsickness

Many people have lived with motion sickness for years without realizing it may be related to an underlying visual or neurological condition.

While not every case is caused by a vision problem, persistent carsickness should not simply be dismissed as “normal.”

A comprehensive evaluation can help determine whether your symptoms are related to the visual, vestibular, or cervical systems—and, more importantly, identify treatments that may significantly improve your quality of life.

If you’ve stopped reading in the car, avoid traveling as a passenger, or plan your life around motion sickness, it may be time to look beyond the inner ear.

Carsickness may be common—but it isn’t always normal, and for many people, it’s treatable.

About Virginia Neuro-Optometry

At Virginia Neuro-Optometry, we specialize in evaluating and treating vision problems associated with concussion, neurological disorders, binocular vision dysfunction, dizziness, and visual motion sensitivity. Working collaboratively with physical therapists, neurologists, occupational therapists, and other healthcare providers, we develop individualized rehabilitation plans designed to improve visual comfort, reduce symptoms, and help patients return to the activities they enjoy.

If persistent carsickness is limiting your daily life, contact us to learn whether a comprehensive neuro-optometric evaluation may help identify the underlying cause.