An eye that turns in, out, up or down changes how a child learns to see, and how an adult sees and is seen. Many people put off treatment because they fear the eye will be taken out or cut open. It is not: strabismus surgery works on the muscles on the outside of the eye.
This page explains when glasses, patching or other treatments come first, how the operation is done, and what results, risks and recovery to expect.
What is strabismus?
Strabismus (squint) means that the two eyes do not point at the same thing. One eye looks straight ahead while the other turns in, out, up or down. The turn may be there all the time or only now and then, for example when a child is tired.
Worldwide, about 2 in 100 people have an eye that turns in or out. Strabismus usually starts in childhood, but it can also begin in adult life: about 4 in 100 people develop it at some point as adults.
- Esotropia: one eye turns in, toward the nose. It is common in babies and in long-sighted children.
- Exotropia: one eye turns out. At first it often shows only when the person is tired, ill or daydreaming.
- Vertical strabismus: one eye sits higher than the other. People often tilt the head to avoid seeing double.
- Paralytic strabismus: a nerve that controls an eye muscle is weakened, for example after a head injury or with diabetes.
- Restrictive strabismus: a muscle is stiff or trapped, as in thyroid eye disease or after a fracture of the eye socket.
When does a child need strabismus surgery?
Every child with a squint needs a full eye examination with dilated pupils. Many squints are linked to long sight or to a lazy eye (amblyopia), and some are treated without any operation. Rarely, a squint is the first sign of an eye disease such as retinoblastoma, a cancer of the retina in young children.
Treatment usually starts with the basics:
- Glasses. In accommodative esotropia, the eye turns in because the child is long-sighted. Glasses alone control the turn in about 2 of 3 of these children.
- Treating a lazy eye first. Patching the better eye, or drops that blur it, make the weaker eye work. This usually comes before surgery and can improve the result.
- Watching. A mild outward turn that the child controls well is often watched or treated with part-time patching.
Surgery is considered when the eye still turns despite glasses and patching, or when the turn is large and constant. In infantile esotropia, a large inward turn that starts before 6 months of age, surgery is usually done before the age of 2. In a European study, children whose eyes were aligned at about 20 months developed some 3D vision more often than children aligned at about 4 years (13.5% vs 3.9%).
Surgery straightens the eyes, but it does not replace glasses or treatment for a lazy eye. Many children still need both afterward.
Can strabismus be corrected in adults?
Yes. There is no upper age limit: people in their 90s have benefited from surgery, and a squint present since childhood can still be corrected. In adults, the operation can:
- remove or reduce double vision;
- correct a head turn or tilt used to avoid double vision;
- widen the area in which both eyes work together;
- restore a normal appearance and eye contact.
The American Association for Pediatric Ophthalmology and Strabismus (AAPOS) calls this reconstructive surgery, not cosmetic surgery, because it restores a normal function. Adults who have been treated report better self-esteem and less anxiety in social situations.
Before surgery, your doctor checks whether straighter eyes could cause double vision. A simple test with prisms simulates the planned result. If the squint was caused by a nerve palsy, thyroid eye disease or a fracture, surgery waits until the measurements have been stable, usually for at least 6 months.
What can be tried before surgery?
| Option | Who it helps | What to know |
|---|---|---|
| Glasses | children whose eye turns in because of long sight | control the turn in about 2 of 3; still needed after any surgery |
| Patching or blurring drops | children with a lazy eye | usually done before surgery |
| Prisms in glasses | adults with double vision or a small turn | reduce double vision; less useful for large turns |
| Eye exercises | trouble turning the eyes in for reading (convergence insufficiency) | office-based therapy works in children; the evidence in adults is weaker |
| Botulinum toxin injection | selected cases, some nerve palsies, after earlier surgery | weakens a muscle for a time; in the few trials, surgery tended to correct the turn more often; a temporary drooping lid is common |
| Waiting | nerve palsy, thyroid eye disease, fracture | some palsies improve by themselves; surgery once the measurements are stable |
How is strabismus surgery done?
The muscles that move the eye are attached to its white outer wall, the sclera. The surgeon reaches them through a small opening in the conjunctiva, the thin clear membrane over the white of the eye. There is no cut in the skin, and the eye stays in its place.
A muscle can be made to pull less or more:
- Weakening (recession): the muscle is detached and stitched back onto the eye wall a few millimeters further back.
- Strengthening (resection or plication): the muscle is shortened, or folded, so that it pulls harder.
- Transposition: when a muscle is paralyzed, parts of the neighboring muscles are moved to take over some of its pull.
Depending on the type of squint, the operation is done on one eye or on both, even when only one eye seems to turn.
1Before surgery
The inner and outer muscles pull the eye in opposite directions.
2Weakening (recession)
The muscle is reattached further back on the eye wall, so it pulls less.
3Strengthening (resection)
A short piece of the muscle is removed, so the muscle is tighter and pulls more.
- Measurements. The turn is measured with prisms, for distance and near and in different directions of gaze. The operation is planned from these numbers.
- Anesthesia. Children have general anesthesia. Adults have general anesthesia or local anesthesia with sedation.
- The operation. It takes about 40 minutes to 2 hours, depending on how many muscles are adjusted. The stitches usually dissolve.
- Home the same day. Strabismus surgery is usually a day procedure.
What are adjustable stitches?
Some adults and older teenagers have adjustable stitches. The muscle is tied with a temporary knot. A few hours later, or within the first week, the position of the eyes is checked while you are awake. The knot is then tightened or loosened under numbing drops. In a large US registry of adults, fewer people with adjustable stitches needed another operation within a year (6.0% vs 8.1%). Young children usually do not have them, because the adjustment needs their cooperation.
What results can you expect?
about 8 in 10
Success is usually defined as a small remaining turn, not perfectly straight eyes. The final position settles over about 6–8 weeks, sometimes up to 3 months. In some types of adult strabismus, double vision when looking straight ahead goes away in more than 95%.
Some eyes drift again over the years, especially an eye that turned out. In a large US registry, most people needed only one operation:
In children with infantile esotropia, 15–30% need more than one operation. That is why children have regular check-ups for years after surgery.
What are the risks?
Strabismus surgery is a common operation, and serious complications are rare. The table lists the main risks, from the most common to the rarest.
| Risk | How often | What happens next |
|---|---|---|
| Redness of the eye | almost everyone | fades over weeks, sometimes up to 3 months |
| The eyes are straightened too little or too much | about 1 in 20 have another operation within a year | glasses, prisms or another operation |
| New double vision (adults) | temporary in about 1 in 10; lasting in fewer than 1 in 100 | usually gone within 6 weeks; prisms if it stays |
| A small cyst, or an allergy to the drops | cysts in fewer than 1 in 200 | drops; a cyst can be removed |
| Any infection | about 1 in 900 operations | antibiotics |
| A slipped or lost muscle | fewer than 1 in 1,000 | another operation to reattach it |
| The needle passes through the wall of the eye | serious in fewer than 1 in 1,000 | the retina is checked; a retinal detachment is rare |
| Infection inside the eye (endophthalmitis) | 1 in 11,000 to 1 in 13,700 | urgent treatment |
In a UK study of about 24,000 operations, a severe complication occurred in about 1 in 400. A poor final result, meaning loss of vision or double vision when looking straight ahead, occurred in about 1 in 2,400. Loss of vision is very rare, about 1 in 30,000.
What is recovery like, and when can you fly home?
Typical recovery after strabismus surgery
Day of surgery
You go home the same day. The eye feels sore and scratchy for a few days.
Within the first week
The first check-up.
After 1 day to 2 weeks
Back to school or work, depending on the job and how you feel.
For 1–4 weeks
You use antibiotic and anti-inflammatory drops.
6 weeks to 3 months
The redness fades, and the eyes settle in their final position.
Avoid swimming for 2–6 weeks, as your surgeon advises. Do not drive for 48 hours after general anesthesia, or for as long as you see double.
Flying is restricted after some eye operations because of a gas bubble placed inside the eye. Strabismus surgery is done on the outside of the eye, and no gas is used, so the eye itself does not stop you from flying. It is still wise to fly home only after the first check-up, about a week after surgery. Your surgeon confirms the date.
What about thyroid eye disease and eye injuries?
In thyroid eye disease, the eye muscles swell and stiffen and pull the eye out of line. The muscle below the eye is affected most often. Muscle surgery is planned only when the disease has been inactive and the measurements have been stable for at least 6 months. If the orbit also needs orbital decompression, that comes first, then eye-muscle surgery, and eyelid surgery last. In published results for thyroid eye disease, about 7 in 10 had good alignment after surgery, and about 6 in 10 were free of double vision.
After a fracture of the eye socket, double vision often improves as the swelling settles. Muscle surgery for double vision that remains is usually planned 6–9 months after the injury. See also war-related eye injuries.
Strabismus surgery in Antalya
Prof. Dr. Elif Betül Türkoğlu performs strabismus surgery for children and adults in Antalya, Türkiye. She is a professor of ophthalmology whose work also covers eye tumors, cataract surgery and oculoplastic surgery. At the consultation, she examines both eyes, measures the squint and explains the options.
If you live abroad, you can first send earlier reports, your glasses prescription and photos of the eyes looking straight ahead and to each side. Plan to stay in Antalya until the first check-up, about a week after surgery. Consultations are in English or Turkish. If needed, BergemHealth, the practice's international patient coordination partner, provides an interpreter and a personal escort who speak Ukrainian and Russian. See international patients.
BergemHealth
Traveling from abroad?
BergemHealth, the practice's international patient coordination partner in Antalya, can arrange airport transfers, accommodation near the clinic and appointment scheduling. If needed, it also provides an interpreter and a personal escort who speak Russian and Ukrainian. All medical decisions are made by Prof. Türkoğlu.
BergemHealth is a licensed travel agency in Antalya (TÜRSAB license A-8469).
Frequently asked questions
Is the eye taken out during strabismus surgery?
No. The eye stays in its place throughout the operation. The surgeon works on the muscles attached to the outside of the eye, through a small opening in the thin membrane over the white of the eye. There is no cut in the skin, and the inside of the eye is not opened.
Is it too late to correct a squint in adulthood?
No. There is no upper age limit, and a squint present since childhood can still be corrected. In adults, surgery can reduce double vision, correct a head tilt, widen the area in which both eyes work together and restore normal eye contact. About 8 in 10 adults have well-aligned eyes after one operation.
Will my child still need glasses after surgery?
Often, yes. Surgery changes the position of the eyes, but it does not correct long sight, short sight or astigmatism, and it does not treat a lazy eye. A child whose eye turned in because of long sight usually keeps wearing glasses. Patching or drops may also continue after the operation.
Does strabismus surgery hurt?
You feel nothing during the operation, because it is done under general anesthesia or local anesthesia. Afterward, the eye usually feels sore and scratchy for a few days; drops and ordinary painkillers help. Pain that increases instead of easing, swelling or discharge needs a check the same day.
Can the squint come back after surgery?
Sometimes. In a US registry of about 126,000 patients, about 1 in 20 had another strabismus operation within 1 year and about 1 in 10 within 5 years. An eye that turned out is more likely to drift again over the years. Regular check-ups find a returning squint early, when it can be treated.
Will I see double after the operation?
Some adults see double for a short time after surgery while the brain adapts to the new position. In a study of adults, this happened in about 1 in 10 and usually faded within 6 weeks; lasting new double vision occurred in fewer than 1 in 100. A prism test before surgery shows whether the planned change could cause it.
Is strabismus surgery cosmetic?
No. Specialist societies consider it reconstructive surgery, because it restores the normal alignment and teamwork of the eyes. In adults, it often reduces double vision and a head tilt, and it widens the area in which both eyes work together. A normal appearance and eye contact are part of that restored function.
When can I fly home after strabismus surgery?
Usually after the first check-up, about a week after surgery. The operation is done on the outside of the eye, and no gas is placed inside it, so the eye itself does not restrict flying. The check-up makes sure that there is no early infection and that healing is on track. Your surgeon confirms the date.
Can a botulinum toxin injection replace surgery?
In some cases. An injection into an eye muscle weakens it for a time and can help with small turns, some nerve palsies or a squint after earlier surgery. In the small number of trials comparing the two, surgery tended to correct the squint more often. A temporary drooping of the upper lid after the injection is common.
References
- American Academy of Ophthalmology. Adult Strabismus Preferred Practice Pattern. 2023. aao.org
- American Academy of Ophthalmology. Esotropia and Exotropia Preferred Practice Pattern. Ophthalmology, 2023. doi.org
- American Association for Pediatric Ophthalmology and Strabismus (AAPOS). Strabismus Surgery. aapos.org
- AAPOS. Adult Strabismus. aapos.org
- AAPOS. Accommodative Esotropia. aapos.org
- American Academy of Ophthalmology. Accommodative Esotropia. EyeWiki. eyewiki.org
- Von Bartheld et al. Global prevalence of horizontal strabismus. Surv Ophthalmol, 2026. doi.org
- Martinez-Thompson JM, et al. Incidence, types, and lifetime risk of adult-onset strabismus. Ophthalmology, 2014. PubMed
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- Bort-Martí AR, et al. Botulinum toxin for the treatment of strabismus. Cochrane Database Syst Rev, 2023. doi.org
- Scheiman M, et al. Interventions for convergence insufficiency: a network meta-analysis. Cochrane Database Syst Rev, 2020. doi.org
- Oke I, et al. [Adjustable sutures and reoperation after strabismus surgery in adults: IRIS Registry]. Ophthalmology, 2022. doi.org
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- Kushner BJ. Intractable diplopia after strabismus surgery in adults. Arch Ophthalmol, 2002. PubMed
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- Heo H, et al. [Incidence of infectious complications after strabismus surgery]. J AAPOS, 2022. doi.org
- Simonsz HJ, Ten Tusscher MPM. [Endophthalmitis after strabismus surgery]. Acta Ophthalmol, 2021. doi.org
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- Arblaster G, et al. [Strabismus surgery for psychosocial reasons: a review]. Br Ir Orthopt J, 2024. doi.org
- Moorfields Eye Hospital NHS Foundation Trust. Squint surgery in adults (patient information). 2018. moorfields.nhs.uk
- MedlinePlus. Eye muscle repair – discharge. 2024. medlineplus.gov
- UK Civil Aviation Authority. Surgical conditions: guidance for health professionals. caa.co.uk
- American Academy of Ophthalmology. Strabismus in Thyroid Eye Disease. EyeWiki. eyewiki.org
- American Academy of Ophthalmology. Strabismus Surgery Complications. EyeWiki. eyewiki.org
- Dikci S, Türkoğlu EB, et al. Canine tooth sendromu [Turkish; canine tooth syndrome]. Türk Oftalmoloji Gazetesi, 2012;42(2):163-165. Listed in the Akdeniz University AVESİS profile
- Ayaz Y, İlhan HD, Türkoğlu Şen EB, et al. Ahmed glokom valf implantasyon cerrahisi sonrası gelişen diplopi ve şaşılık tedavisi: olgu sunumu [Turkish; diplopia and strabismus after Ahmed glaucoma valve surgery: case report]. Akdeniz Tıp Dergisi, 2020;6(1):140-144. Listed in the Akdeniz University AVESİS profile
