What is Squint (Strabismus) Surgery?
Squint (Strabismus) Surgery is an extraocular muscular alignment procedure performed to correct misaligned eyes that point in different directions (e.g., turned inward, outward, upward, or downward). Six extraocular muscles control eye movement. During strabismus surgery, specific muscles are strengthened (resected/advanced) or weakened (recessed) to ensure both eyes focus simultaneously on the same target, restoring binocular vision, 3D depth perception (stereopsis), and symmetrical aesthetic alignment.
Who Needs Squint Surgery?
Squint surgery is indicated in children and adults when eye misalignment cannot be fully corrected with glasses, prisms, or vision therapy.
Key clinical indicators include:
- Visible ocular deviation: Esotropia (inward turn), Exotropia (outward turn), Hypertropia (upward turn).
- Double vision (diplopia) in adults caused by paralytic or thyroid eye disease.
- Risk of Amblyopia ("lazy eye") in young children due to visual suppression of one eye.
- Abnormal head tilting or turning (torticollis) adopted to compensate for diplopia.
- Psychological or social self-consciousness regarding misaligned facial appearance.
Types of Strabismus Procedures
- Recession (Muscle Weakening): Detaching the tight muscle and reattaching it further back on the eyeball to reduce its pull.
- Resection (Muscle Strengthening): Removing a short segment of a weak muscle and reattaching it to its original site to increase its pull.
- Adjustable Suture Surgery: Utilizing sliding knots that allow fine-tuning of eye alignment hours after surgery under local anesthesia (ideal for adult complex squints).
- Minimally Invasive Strabismus Surgery (MISS): Using tiny conjunctival keyhole incisions for reduced post-operative redness and faster healing.
Note on Age: Squint surgery can be safely and successfully performed at any age, from infants under 1 year old to elderly adults.
Benefits of Squint Surgery
- Restoration of binocular single vision and 3D depth perception (stereopsis).
- Elimination of double vision (diplopia) and elimination of compensatory head posture.
- Prevention or treatment of Amblyopia (lazy eye) in young pediatric patients.
- Dramatic improvement in personal self-confidence, eye contact, and cosmetic appearance.
What to Expect Before Surgery?
Preoperative orthoptic assessment measures precise deviation angles:
- Prism Bar Cover Test (PBCT): Quantifying the exact angle of squint in prism diopters across all gaze directions.
- Sensory & Stereopsis Testing: Evaluating binocular depth perception and fusion capacity.
- Motility & Cranial Nerve Exam: Identifying paralyzed or overacting extraocular muscles.
- Pediatric Anesthesia Clearance: General anesthesia evaluation for children.
Complete Procedure
The surgical steps for Strabismus surgery involve:
- Administering general anesthesia (for children) or topical/local anesthesia (for adults).
- Placing a small speculum to gently hold the eyelids open.
- Making a micro-incision in the conjunctiva to access the underlying extraocular muscle.
- Isolating the target eye muscle using a muscle hook.
- Measuring the exact millimeters of recession or resection with surgical calipers.
- Suturing the muscle in its new calculated position on the sclera using absorbable micro-stitches.
- Closing the conjunctiva with self-dissolving stitches or leaving self-sealing incisions in MISS.
What to Expect During Surgery?
The procedure takes 30 to 60 minutes depending on whether 1, 2, or more muscles are adjusted. Pain is absent during surgery, and patients go home the same day.
Surgical vs Non-Surgical Alignment
| Feature | Surgical Muscle Realignment | Non-Surgical Therapy (Prisms/Glasses) |
|---|---|---|
| Scope | Corrects moderate-to-high structural deviations | Corrects mild or accommodative deviations |
| Permanence | Permanent anatomical correction | Effective only while wearing glasses/prisms |
| Double Vision | Directly fixes muscle imbalance | Uses prisms to merge images optically |
| Recovery | 1 to 2 weeks | Immediate |
Success Rate and Safety
Squint surgery has a primary success rate of 80% to 90% in achieving ideal ocular alignment within 10 prism diopters. Re-alignment surgery can be performed if minor residual deviation remains.
Squint Surgery Cost Estimate
| Procedure Complexity | Cost Range per Eye (INR) |
|---|---|
| Single Muscle Surgery (Unilateral) | ₹30,000 - ₹45,000 |
| Two Muscle Surgery (Standard) | ₹45,000 - ₹65,000 |
| Complex / Adjustable Suture Surgery | ₹60,000 - ₹85,000 |
| Re-operation / Reconstructive Strabismus | ₹70,000 - ₹95,000 |
Disclaimer: Cost varies based on patient age (pediatric general anesthesia setup vs adult local), number of muscles operated, and hospital category.
Recovery Guide & Post-Operative Care
Recovery Timeline
- Day 1-3: Eyes appear red and slightly watery; mild soreness when moving eyes.
- Week 1-2: Redness fades significantly; eye alignment becomes visually apparent.
- Week 3-4: Absorbing sutures dissolve completely; full resumption of swimming and active sports.
Post-Op Precautions & Care
- Antibiotic Drops: Apply prescribed antibiotic-steroid combination eye drops for 2–3 weeks.
- Water Protection: Keep tap water, soap, and pool water out of the eyes for 2 weeks.
- No Rubbing: Prevent children or adults from rubbing the operated eye.
- Redness Reassurance: Reassure the patient that pinkish or red eye discoloration is completely normal and temporary.
Frequently Asked Questions
Can squint surgery be done on adults?⌄
Yes! Squint surgery is equally successful in adults as in children. It restores proper eye alignment, eliminates double vision, and significantly enhances facial appearance and confidence.
Will squint surgery improve vision in a lazy eye?⌄
Squint surgery aligns the eyes physically. If a lazy eye (amblyopia) exists, additional occlusion therapy (eye patching) or vision therapy is needed alongside surgery to train the brain to see clearly.
Are the stitches removed after squint surgery?⌄
No, surgeons use ultra-fine absorbable sutures that naturally dissolve on their own within 2 to 4 weeks, requiring no painful stitch removal.
Is general or local anesthesia used for squint surgery?⌄
General anesthesia is used for children to ensure complete safety and comfort. Adults can undergo squint surgery under local or topical anesthesia, often with adjustable sutures.
Can a squint return after surgery?⌄
In over 85% of cases, a single surgery provides long-lasting alignment. In a small percentage of complex cases, minor drift can occur over years, which can be re-adjusted with a touch-up procedure.