What is strabismus?
In strabismus, one or both eyes point in a different direction from their intended target. The misalignment can be constant or intermittent, and it can alternate between eyes. Because the brain receives two conflicting images, it typically responds by suppressing the turned eye — which, over time, can lead to amblyopia (lazy eye) in that eye.
Strabismus is not simply a muscle problem. While the extraocular muscles control where the eye points, it is the brain that coordinates their movement. This is why surgery — which physically adjusts the muscle — does not automatically restore binocular vision. Vision therapy addresses the neural component that surgery cannot.
Signs and symptoms
- Visible eye turn — one eye drifts inward, outward, up, or down
- Double vision (may be constant or only under fatigue or stress)
- Head tilting or turning to achieve a clearer image
- Squinting or closing one eye, especially outdoors
- Reduced or absent depth perception
- Poor reading performance when amblyopia accompanies the turn
Vision therapy approach
Our strabismus programs are built around re-establishing binocular vision — the ability to use both eyes simultaneously to perceive a single, three-dimensional image. This is a neurological skill that requires training, not just a mechanical correction.
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1Full binocular vision evaluationWe measure the angle of deviation, eye dominance, suppression depth, stereopsis (depth perception), and accommodative function to guide the treatment plan.
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2Antisuppression and sensory fusionWe train the brain to accept and integrate input from the turned eye, reducing suppression that leads to amblyopia and monocular visual function.
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3Motor fusion and vergence controlActivities develop precise motor commands to align the eyes, expand the range of comfortable binocular vision, and reduce the frequency and angle of the deviation.
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4Stereopsis and depth perceptionAs alignment and fusion stabilise, we develop stereoscopic depth perception — the full three-dimensional visual experience that strabismus suppresses.
Frequently asked questions
Is surgery the only option for strabismus?
No. Surgery addresses the cosmetic appearance of the eye turn by adjusting the length of the extraocular muscles, but it does not retrain the brain to use both eyes together. Many patients see the eye drift back after surgery. Vision therapy, sometimes combined with surgery when needed, builds the binocular function that makes the correction durable.
Can strabismus be treated without surgery?
Yes — especially for intermittent (part-time) strabismus and for cases where the primary goal is binocular function rather than cosmesis. Our developmental optometrists will evaluate whether vision therapy alone, or in combination with surgery or prisms, is the right approach for your specific presentation.
What types of strabismus respond best to vision therapy?
Intermittent exotropia (outward drift), convergence insufficiency-type exotropia, and small-angle esotropia respond well to vision therapy. Large-angle constant strabismus may require surgery first, followed by vision therapy to consolidate binocular function. Your evaluation will clarify which pathway is appropriate.
Does treating strabismus also treat amblyopia?
The two conditions often co-exist. Strabismus frequently causes amblyopia in the turned eye because the brain suppresses that eye to prevent double vision. A comprehensive treatment plan addresses both: vision therapy to restore eye alignment and binocular function, with amblyopia treatment to improve acuity in the weaker eye simultaneously.
Related conditions
Ready to take the next step?
Schedule a comprehensive binocular vision evaluation at our Inwood, NY practice. We'll identify whether vision therapy is right for you or your child and walk you through every step of the process.
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