Strabismus (Eye Muscle) Surgery: Risks, Complications, and Informed Consent Essentials

Procedure Overview

Strabismus surgery adjusts extraocular muscle tension (recession, resection, plication, transposition) to restore ocular alignment. Performed under general anesthesia (children) or topical/regional (cooperative adults). Outpatient in most cases.

Complication Profile

Common (1–10%)

• Transient diplopia: 20–50% initially; resolves in weeks–months as neuroadaptation occurs.
• Conjunctival swelling/chemosis: Days to weeks; lubricants, steroids.
• Pain/discomfort: 1–3 days; NSAIDs, cool compresses.
• Subconjunctival hemorrhage: Self-limited.

Uncommon (0.5–5%)

• Undercorrection/overcorrection: May require reoperation (10–20% overall reoperation rate).
• Persistent diplopia: Requires prism, botulinum toxin, or revision surgery.
• Infection (preseptal/orbital cellulitis): Rare with sterile technique; treat with antibiotics.
• Granuloma/pyogenic granuloma: At suture site; excision if persistent.
• Anterior segment ischemia: Rare; risk with multiple muscle surgery, prior scleral buckle, vascular disease.

Rare but Serious (<0.5%)

• Globe perforation: Scleral penetration during muscle reattachment; may require vitrectomy.
• Lost muscle: Retracted behind globe; requires exploration.
• Optic nerve injury: Direct trauma or compressive hemorrhage.
• Malignant hyperthermia / anesthesia complications: Per anesthesia team.

Special Considerations

• Adjustable sutures: Allow postoperative alignment titration (awake, topical anesthesia); reduce reoperation rate.
• Thyroid eye disease: Higher reoperation rate; operate only when stable ≥6 months.
• Prior scleral buckle / retinal surgery: Higher anterior segment ischemia risk; limit muscles per session.
• Children: Amblyopia therapy must continue postoperatively; alignment ≠ visual development.

Informed Consent Discussion Points

• Probability of alignment improvement vs. perfect orthophoria.
• Possibility of over/undercorrection and reoperation.
• Transient diplopia expectation.
• Rare vision-threatening risks.
• Need for continued amblyopia therapy (children).
• Long-term drift possibility (years later).

Overall success (alignment within 10 prism diopters) is 70–85% for horizontal deviations. Thorough preoperative sensorimotor exam and realistic expectation-setting are paramount.