See-sick syndrome (neuro-ocular vestibular dysfunction)



Vertigo, dizziness

Many patients come to us with motion-sickness type symptoms.  Dizziness and sensitivity to light are common symptoms.  Many of these patients have been to many other specialists, such as the family physician, neurologists, vestibular specialists, ear, nose and throat specialists and even acupuncturists.

Typically, all of these professionals tell the patient that there is nothing wrong.  This is not surprising, as studies have shown that vertigo is an underestimated symptom of eye and vision disorders. Many professionals that a patient consults are simply not equipped with the knowledge or experience to diagnose an eye or vision problem that can cause vertigo-like symptoms. 

However, something is definitely wrong.  Many of these patients can no longer drive safely and cannot even go to the supermarket without feeling nauseous. That's why this dysfunction is sometimes called "super-market syndrome".It is also called "see sickness syndrome", also known a neuro-ocular vestibular dysfunction  

Vision therapy is an effective treatment.  Vision therapy relies on the principle of neuroplasticity and involves a doctor and therapist treating the patient with exercises to "re-wire" the eye-brain connection, teaching the patient new eye and motion related skills.  In this way, vision therapy is similar to speech therapy or occupational therapy but focused, of course, on the eyes and visual system.

See Sick Syndrome (SSS) is the combination of motion sickness and photophobia. SSS is not well understood by many professions and is not typically diagnosed during a standard eye or medical examination. However, many patients will recognize themselves when presented with a list of symptoms.

Based on clinical observations by Dr. Gillian (an American optometric physician and a leading doctor in this field), SSS occurs in approximately 6% of the female population and 1% of the males, and it is usually familial.  Dr. Gillian's website is at

Symptoms of see sick syndrome

The severity and frequency of various SSS symptoms can vary widely. Most SSS patients have at least two of the following:

  • motion sickness (e.g., nausea, headache, dizziness, fatigue, malaise, drowsiness, depression, bodily warmth, pallor, and/or cold sweats) 
  • repeated eye movement, especially when observing rapid motion
  • unusual sensitivity to light. 

The symptoms of SSS and the ability to manage motion can vary from day to day. One reason is that motion effects can be cumulative. An exposure to motion can make one less able to handle a new exposure for up to three days later.

SSS symptoms are usually mild in children but become more severe over a period of years. This is may be caused by an avoidance of  symptom producing activities by adults and the resulting loss of adaptation and coping strategies.

Almost all SSS patients have life-long histories of carsickness, which occurs almost exclusively in the daytime. The reason for this is that you see less peripheral motion when driving at night. Reduced awareness of objects in the periphery (functional tunnel vision) also occurs in SSS but patients usually don't notice this although the often report a history of clumsiness, which is consistent with having reduced peripheral awareness.

The following conditions can make SSS worse:

  • fatigue, 
  • pre-menstrual syndrome (PMS), 
  • hypoglycemia 
  • inner ear conditions  Dr. Gillian has a YouTube channel under the name MotionDoctor1,where you can watch some informative videos.  Here are some of them:


Here is a checklist of symptoms:





 Car Sickness

·   Mild car sickness.
·   Cannot read (look down) in a car more than a few seconds without nausea, headache and/or dizziness.

·  Necessity to be the driver to avoid nausea while traveling in a car, even on a straight road.
·   Inability to look backwards in a car without nausea. 
·  Nausea when driving on tree lined roads when the sun casts shadows across the road.

·   Riding in or even driving a car for more than a few minutes may result in severe HA, fatigue, and/or nausea.

 Light sensitivity

·   Unusual sensitivity to light to a moderate degree. 
·  Must wear sunglasses outdoors, even on cloudy days. 
· Feels uncomfortable in brightly lit buildings or places with shiny floors such as grocery stores, classrooms, offices, or malls.
·   Eye pain or headache when exposed to a “flash of light” or being outside without sunglasses, even on cloudy days, or being in a brightly lit place.

·     Unusually long after images after looking at most sources of light (several minutes). 
·  Computer screen brightness causes discomfort. 
·  Sensation of being “blinded” when looking at oncoming headlights.

·   Severe sensitivity to light both indoors and out.
·   They are the type of person to turn off lights and pull down shades.
·  severe dislike of light


·  Inability to sit close to a movie screen or watch movement of a train or a carnival ride without nausea, headache, and/ or dizziness.

·  Inability to look at stripes or watch rapid movement on television without nausea,headache, or dizziness.

· Inability to watch more than minimal motion without dizziness or nausea, such as watching ones own hand while eating.


· Frequent and sometimes daily “dull” or “pressure” headaches.

·  Exposure to any activities which involve observations of movement or eye movement for more than a few minutes can cause severe headaches which may last a few days.

·   Constant or very frequent nausea, headaches, or dizziness which can range from mild to severe.


Image courtesy of winnod /



Strabismus, 3D & VT

Children's Vision

Convergence Insufficiency

Life-Saving Eye Exam