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See Sick Syndrome: The Overlooked Link Between Vision and Balance

by | Jun 1, 2026 | Manuscripts | 0 comments

Jeyalakshmi S, M. Optom, FBV.VT

Optometrist and Vision Therapist, Divine Myndz Vision Care and Therapy Centre, Trichy, India

 

When patients report dizziness, nausea, light sensitivity, or discomfort in visually busy environments, the cause may not always be vestibular or neurological. (1) In some cases, symptoms result from See Sick Syndrome (SSS), also known as Neuro-Ocular Vestibular Dysfunction (NOVD), caused by a mismatch between visual and vestibular input. (1,2) Since these systems work together to maintain balance and spatial orientation, disruption can lead to visually induced motion sickness despite normal ocular findings. (1,3) As patients rarely link these symptoms to vision, SSS is often overlooked during routine eye examinations. (1)

Clinical Presentation

Patients with NOVD commonly report symptoms of visually induced motion sensitivity, including: (1,2,3)

  • Dizziness or nausea while reading in a moving vehicle
  • Headache or ocular discomfort in brightly lit environments
  • Photophobia and prolonged after-images following flash exposure
  • Difficulty tolerating rapid visual motion (television, scrolling, moving crowds)
  • Discomfort in visually complex spaces such as malls, grocery stores, or classrooms

In more severe cases, patients may develop functional tunnel vision, reduced peripheral awareness, and persistent disequilibrium. (1,2)

Why Does It Happen?

The Vestibulo-Ocular Reflex (VOR) stabilises gaze during head movement by coordinating eye and vestibular input. (3) When binocular instability, oculomotor dysfunction, or accommodative deficits interfere with this system, the patient may develop symptoms of sensory conflict. (3) This mismatch is particularly evident in visually stimulating environments where the brain struggles to integrate motion and spatial information efficiently. (3)

Impact on Development

  1. Delayed Milestones: Coordination challenges disrupt early motor skills (sitting, crawling, walking). (4,5,6)
  2. Cognitive Fatigue: Manually processing balance and vision drains mental energy, leaving less bandwidth for learning. (6,7)
  3. Emotional Dysregulation: Keeps the nervous system in a constant “fight or flight” state, triggering anxiety and meltdowns. (5,7)

Clinical Evaluation

A comprehensive neuro-optometric assessment is essential when NOVD is suspected. Beyond refraction and visual acuity, evaluation should include: (3)

  1. Binocular vision and vergence testing
  2. Accommodation and focusing facility
  3. Oculomotor and pursuit analysis
  4. Visual-perceptual assessment
  5. Sensorimotor integration testing

Differential diagnosis is crucial, as vestibular disorders such as benign paroxysmal positional vertigo, Ménière’s disease, vestibular neuritis, and labyrinthitis may present with overlapping symptoms. (1,6)

Management Strategies

Pharmacological agents such as antihistamines or vestibular suppressants may offer temporary symptom relief but do not address the underlying visual-vestibular dysfunction. (2,3) The mainstay of treatment is Dynamic Adaptive Vision Therapy (DAVT) – a structured neuro-optometric rehabilitation program designed to improve visual motion tolerance and sensory integration. (2)

DAVT commonly includes: (1)

Figure 1: The image shows the different key vision therapies and their purposes.

Image Courtesy: Created by the Author

Most patients report significant improvement within 4–8 weeks of structured therapy when compliant with treatment protocols. (1)

Final Thoughts

SSS is an under-recognised yet clinically important cause of dizziness, photophobia, and motion sensitivity. (1,2) For optometrists, particularly in binocular vision and neuro-optometry, identifying visual contributions to vestibular symptoms is essential. (1–3) Early diagnosis and targeted rehabilitation can improve comfort, balance, and quality of life, making neuro-optometric assessment vital in managing unexplained dizziness and motion intolerance. (3)

References

  1. Chan, N. M., & Nguyen, H. T. (2005). Diagnosis and Management of the See Sick Syndrome (neuro-ocular-vestibular Dysfunction) (Doctoral dissertation, Pacific University).
  2. Turgut B, Turgut FA (2017) Neuro-Ocular Vestibular Dysfunction: An Overlooked Illness. Adv Ophthalmol Vis Syst 7(7): 00255.
  3. Cohen, A. H. (2013). Vision rehabilitation for visual-vestibular dysfunction: the role of the neuro-optometrist. NeuroRehabilitation, 32(3), 483-492.
  4. Cronin, G. W. (2012). Pediatric vestibular disorders. Retrieved November, 15, 1-8.
  5. Bilgrei, R. (2014). Emotional Aspects of Vestibular Disorders. Vestibular Disorders.
  6. Guo, J., Wang, J., Liang, P., Tian, E., Liu, D., Guo, Z. … Zhang, S. (2024). Vestibular dysfunction leads to cognitive impairments:
  7. State of knowledge in the field and clinical perspectives (Review). International Journal of Molecular Medicine, 53, 36.
  8. Xie, D., Welgampola, M. S., Miller, L. A., Young, A. S., D’Souza, M., Breen, N., & Rosengren, S. M. (2022). Subjective Cognitive Dysfunction in Patients with Dizziness and Vertigo. Audiology & neuro-otology, 27(2), 122–132.

About the Author

Jeyalakshmi S

Optometrist and Vision Therapist

 

Divine Myndz Vision Care and Therapy Centre, Trichy, India

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