Closing your eyes can provide some relief from motion sickness, but it’s not the most effective visual strategy available. Research suggests that keeping your eyes open and focused on a stable reference point, like the horizon, actually works better than shutting your eyes entirely. The reason comes down to how your brain processes conflicting signals from your eyes and inner ear.
Why Motion Sickness Happens
Motion sickness is fundamentally a conflict between your senses. Your inner ear detects acceleration, tilting, and rotation. Your eyes track what’s moving around you. And receptors throughout your body sense pressure and position. When these systems send mismatched signals, your brain struggles to reconcile them, and the result is nausea, dizziness, and cold sweats.
Specific neurons in the brainstem and deep cerebellar nuclei appear to be the neural hardware behind this mismatch detection. These cells fire in patterns that correspond directly to the size of the gap between what your vestibular system feels and what your other senses report. The bigger the conflict, the worse you feel.
Reading in a car is a classic trigger: your inner ear registers every turn and bump, but your eyes are locked on a stationary page. Your brain interprets the mismatch as something potentially dangerous (historically, sensory confusion could signal poisoning), and it responds with nausea as a protective measure.
What Closing Your Eyes Actually Does
When you close your eyes, you eliminate the visual side of the conflict entirely. Your brain stops receiving visual signals that contradict what your inner ear is reporting. This removes one source of confusion, which is why it can take the edge off nausea for many people. The CDC lists shutting your eyes as one of several strategies travelers can try, alongside lying down and sleeping.
In virtual reality settings, closing your eyes or removing a headset is considered one of the most immediately available remedies against cybersickness, often preventing vomiting when symptoms escalate quickly. When you can’t change your environment, cutting off visual input is a fast, no-cost option.
But there’s a catch. Without vision, your body loses a critical tool for stabilizing itself. Research shows that when the head moves in darkness, the visual system can’t help maintain a stable position, leaving the vestibular system to manage balance alone. This can actually heighten your sensitivity to motion rather than reduce it. Clinical testing confirms that involuntary eye movements triggered by inner ear stimulation get worse, not better, when visual input is removed.
Eyes Open Works Better in Cars
A study examining passengers in cars during lateral acceleration (the forces you feel going around curves) found a result that surprises most people: sickness ratings in the eyes-open condition were significantly lower than in the eyes-closed condition. Even when passengers combined eye closure with an active head-tilting strategy designed to reduce symptoms, keeping their eyes open still outperformed closing them.
The reason is that your visual system does more than just cause conflict. It also helps resolve it. When you look at something stable, like the road ahead or the horizon, your eyes give your brain a reliable reference frame that matches what your inner ear is detecting. Your brain can use that consistent information to make sense of the motion and calm the mismatch signal. Studies show people can suppress the involuntary eye movements associated with inner ear stimulation quite well with a visible target, but only partially with an imaginary one (like trying to picture a fixed point with eyes closed).
This is why the most common expert advice for car sickness is to sit in the front seat and look out the windshield. You’re giving your visual system access to the same motion cues your inner ear is picking up, which shrinks the sensory conflict rather than just hiding half of it.
When Closing Your Eyes Makes More Sense
Context matters. Closing your eyes is a better choice when you can’t access a stable visual reference. Below deck on a boat, in the windowless cabin of a ship, or in the back of a van with no windows, there’s nothing useful to look at. In those situations, your eyes would only register the swaying interior around you, which amplifies the conflict. Shutting them out is the smarter move.
Closing your eyes also helps if you’re already deep into symptoms and need to stop them from escalating. Lying down with your eyes closed reduces head movement, eliminates confusing visual input, and lets your vestibular system operate without contradiction. Sleep, when possible, is one of the most effective natural remedies because it suppresses the conscious processing of sensory conflict altogether.
For VR-induced sickness, removing the headset is obviously ideal. But if you need a moment to recover before standing up, closing your eyes briefly can prevent the worst symptoms from progressing.
The Most Effective Visual Strategies
If you’re prone to motion sickness, your best option is matching what your eyes see to what your body feels. A few practical approaches:
- Look at the horizon or the road ahead. This gives your brain a stable visual anchor that confirms the motion your inner ear detects. On boats, standing on deck and watching the horizon is consistently more effective than going below.
- Sit in the front seat of a car. Front-seat passengers can see the road and anticipate turns, which dramatically reduces sensory conflict compared to rear-seat positions.
- Choose a window seat on planes and trains. Even a partial view of the outside world helps your brain calibrate.
- Tilt your head into curves. Leaning your head toward the inside of a turn (the direction the car is turning) reduces the mismatch between your inner ear’s signal and your body’s position. Combined with keeping your eyes open, this produced the lowest sickness ratings in car studies.
- Stop reading or using your phone. If you can’t look outside, closing your eyes is better than staring at a screen or book that your brain interprets as stationary while your body is moving.
The hierarchy, in practical terms: looking at a stable external reference is best, closing your eyes is second best, and staring at something inside the vehicle is worst. Your instinct to shut your eyes when nausea hits isn’t wrong. It does help compared to the alternative of reading or scrolling. But if you have the option to look out at the world moving around you, that will almost always work better.