Squint (Strabismus) Repair

Overview

Squint, or strabismus, is a misalignment of the eyes in which they do not point in the same direction. Unilateral squint repair is eye-muscle surgery, performed on one eye, to correct the alignment so the eyes work together better, relieve double vision where present, and improve appearance. Each eye is moved by six small extraocular muscles, and surgery rebalances their pull.

Strabismus can be present from childhood or develop later from nerve problems, thyroid eye disease, injury, or other causes. In children, an uncorrected squint can lead to amblyopia (a lazy eye) because the brain suppresses the image from the turned eye; in adults, a new squint often causes bothersome double vision.

Squint surgery is common and generally safe, but it aims to improve rather than perfectly guarantee alignment, and some patients need more than one procedure. This page is an educational overview only — it is not medical advice, and no outcome can be guaranteed.

Who May Need This

Repair may be considered for children and adults with a noticeable or symptomatic eye misalignment that has not been corrected by glasses, patching, or exercises. In children, surgery is often part of a broader plan that also treats any lazy eye. In adults, it is frequently done to relieve double vision or to restore a straight, more natural eye position.

Common conditions include eyes that turn inward (esotropia), outward (exotropia), or vertically. An ophthalmologist — often a paediatric or strabismus specialist — assesses the type, size, and cause of the squint and how it affects vision before recommending surgery on one or both eyes.

When It May Be Recommended

Surgery may be recommended when the misalignment is significant, causes double vision or a cosmetically or socially troubling appearance, or, in children, threatens the development of binocular vision or contributes to amblyopia. It is usually considered after non-surgical measures — corrective glasses, treatment of a lazy eye, and sometimes prisms or exercises — have been optimised.

Timing depends on the cause: some childhood squints are treated early to give the best chance of the eyes working together, while squints from an unstable condition (such as active thyroid eye disease) are usually stabilised first. The recommendation weighs the potential benefit against the risks and the possibility of needing further surgery.

Diagnosis and Evaluation

Evaluation includes measuring the angle of misalignment in different directions of gaze, assessing each eye’s vision and the presence of amblyopia, and checking eye movements and how the eyes work together (binocular function). A full refraction determines whether glasses alone could reduce the squint.

The surgeon looks for underlying causes such as nerve palsies or thyroid eye disease and reviews general health and prior eye surgery. In adults with double vision, prism testing helps plan treatment. A second opinion may be valuable, particularly for complex or previously operated squints.

Treatment Options

Not all squints need surgery. Glasses can correct some types (especially accommodative esotropia), patching or atropine treats an associated lazy eye, and prism lenses can relieve double vision in adults. Botulinum toxin injection into an eye muscle is an option for certain squints.

When surgery is chosen, the surgeon weakens or strengthens specific muscles: recession (re-attaching a muscle further back to weaken it) and resection (shortening a muscle to strengthen it), performed on one eye (unilateral) or both. Adjustable sutures may be used in cooperative adults to fine-tune alignment shortly after surgery. The plan is tailored to the type and size of the squint.

How It Is Performed

Squint surgery is usually an outpatient procedure, performed under general anaesthesia in children and under general or local anaesthesia in adults. The eye is not removed from the socket; instead the surgeon gently opens the thin membrane (conjunctiva) over the white of the eye to reach the eye muscles.

The chosen muscle is then recessed (detached and re-attached further back to weaken it) or resected (shortened to strengthen it) to rebalance the eye’s alignment, and the conjunctiva is closed with dissolvable sutures. In adjustable-suture cases, the final position is fine-tuned while the patient is awake soon afterwards. The procedure typically takes under an hour.

Preparation

Preparation includes completing the measurements and any glasses or lazy-eye treatment beforehand, reviewing medications with your surgeon, and following fasting instructions for anaesthesia. For children, plan for a carer to stay, and for adults, arrange for someone to take you home.

If you are travelling abroad, bring your eye records, prior measurements, and details of any previous squint surgery, and plan for the follow-up visits your surgeon recommends — including any early adjustable-suture check — before flying home.

Benefits and Expected Goals

The goals of surgery are to straighten the eyes, relieve double vision where present, improve the chance of the eyes working together, and restore a more natural appearance that can benefit confidence and social interaction. Many appropriately selected patients achieve a marked improvement in alignment.

Benefits vary with the type and cause of the squint. Surgery may not achieve perfect alignment, some patients still need glasses or prisms, and further surgery is sometimes required. Your surgeon can explain the realistic goals for your particular squint.

Risks and Possible Complications

Squint surgery is generally safe, but risks include the following.

• Under-correction or over-correction of the alignment, sometimes needing further surgery
• Double vision, which may be temporary or, less commonly, persistent
• Redness, swelling, and irritation during healing
• Infection or, rarely, a slipped or lost muscle
• Scarring of the conjunctiva or a persistent red patch
• Very rarely, injury to the eye wall (perforation) affecting vision

Your surgeon will explain the risks specific to your case and how a residual squint would be managed. Report increasing pain, discharge, or vision changes promptly.

Recovery, Follow-up & Aftercare

The eye is usually red, gritty, and sore for one to two weeks, and the redness can take several weeks or longer to fade fully. You will use antibiotic and anti-inflammatory drops for a couple of weeks as directed, and should avoid rubbing the eye, swimming, and dusty environments while it heals.

Temporary double vision or fluctuating alignment can occur as the eyes settle, and children may return to school within a week or so. Attend follow-up so alignment and healing can be checked, continue any lazy-eye treatment or glasses as advised, and arrange this care locally before returning home.

Medical Tourism Planning

If you are considering squint surgery abroad, choose a JCI- or ISO-accredited hospital with an ophthalmologist experienced in strabismus surgery — ideally a paediatric or strabismus specialist for children or complex cases. Ask whether one or both eyes will be operated on and whether adjustable sutures are used.

Plan for the pre-operative measurements, surgery, and the follow-up your surgeon recommends, and arrange continuing eye care, including any ongoing lazy-eye treatment, at home. Request a written treatment plan and cost estimate before travelling, and consider medical travel insurance.

Estimated Cost Factors

The cost of squint repair depends on the country and hospital, the surgeon’s fees, whether one or both eyes and how many muscles are operated on, the use of adjustable sutures, general versus local anaesthesia, and follow-up visits. Complex or repeat surgery after previous operations may cost more.

Many destinations offer strabismus surgery at a fraction of typical US prices, but figures vary and online prices are only estimates. Always request a personalized written quote that specifies what is included before deciding.

Choosing a Hospital or Specialist

Look for an accredited hospital and an ophthalmologist with substantial experience in strabismus surgery, and a paediatric ophthalmology service if the patient is a child. Ask how many squint surgeries they perform, how they handle under- or over-correction, and whether they use adjustable sutures.

Confirm what international patient services and follow-up are available, including coordination of any continuing lazy-eye treatment. Transparent written pricing and a clear discussion of realistic alignment results are signs of a quality programme.

Alternatives

Depending on the type of squint, alternatives to surgery include corrective glasses (which fully control some childhood squints), patching or atropine for an associated lazy eye, prism lenses to relieve double vision, and botulinum toxin injections into an eye muscle for selected cases. Some small or intermittent squints are simply monitored.

Each option has different benefits, durability, and limitations, and non-surgical measures are usually optimised before surgery. Discuss all reasonable alternatives with a strabismus specialist so the plan fits the type and cause of your squint.

Questions to Ask Your Doctor

• What type of squint do I (or my child) have, and what is causing it?
• Will you operate on one eye or both, and how many muscles?
• How likely is a full correction, and might more than one operation be needed?
• Will glasses, prisms, or lazy-eye treatment still be needed afterwards?
• What are the specific risks in my case, including double vision?
• How experienced are you with strabismus surgery, and do you use adjustable sutures?
• How long should I stay in-country, and what is included in the written cost estimate?