All major vision correction procedures — LASIK, PRK, SMILE, and EVO ICL — have excellent safety profiles when performed on appropriate candidates by experienced surgeons. Each carries a different risk profile. The “safest” depends on your individual anatomy and what risk categories concern you most.
Safety data is discussed in detail in the Vision Correction Procedures Compared hub, particularly at Success Rates Compared: LASIK, PRK, and EVO ICL.
Featured Snippet: Risk Comparison by Procedure
| Procedure | Primary Risk Concerns | Rate of Serious Complications | |———–|———————-|——————————-| | LASIK | Dry eye, flap complications, ectasia (wrong candidate) | <1% | | PRK | Subepithelial haze (high corrections), longer discomfort | <1% | | SMILE | Rare: incomplete lenticule extraction | <0.5% | | EVO ICL | Rare: elevated IOP, cataract (older designs) | <0.5% |
The Core Safety Principle
Safety in refractive surgery is not primarily a question of procedure — it is primarily a question of candidate selection.
The most common serious complication in laser refractive surgery is ectasia — progressive corneal thinning and distortion that occurs when laser ablation is performed on a cornea that was too thin, irregularly shaped, or anatomically at risk (early keratoconus). This complication is not random. It is predictable and preventable through rigorous pre-operative screening.
Practices that use comprehensive topographic screening, corneal tomography (Pentacam or equivalent), and conservative patient selection produce ectasia rates approaching zero in their appropriately screened populations. Practices that skip or rush screening produce measurably higher rates.
This is why the quality of your pre-operative evaluation — not just the procedure chosen — is the most important safety factor you control.
Procedure-Specific Safety Profile
LASIK: The most widely performed procedure and most thoroughly studied. Serious complications in appropriately selected patients are rare (approximately 1 in 500–1,000). The most common meaningful complication is clinically significant dry eye (5–10% of patients); serious LASIK-specific complications (flap displacement, diffuse lamellar keratitis) occur in approximately 0.1–0.3% of cases and are typically manageable.
PRK: Eliminates all flap-related risks. The corneal surface is the surgical site, and the main risk (subepithelial haze at high corrections) is dramatically reduced by mitomycin-C prophylaxis applied during surgery. PRK is often considered the “safer” laser option for patients with thin corneas or marginal topography.
SMILE: Eliminates flap risk. The main procedural risk is incomplete lenticule extraction — requiring conversion to a LASIK or PRK approach — which occurs in experienced hands at less than 1% of cases.
EVO ICL: As an intraocular procedure, EVO ICL carries small but non-zero risks not present in corneal surgery — including rare infection (endophthalmitis, approximately 1 in 2,000–3,000) and, with older ICL designs, a risk of accelerated cataract formation. The EVO+ (current generation) design has substantially reduced cataract risk through a central fluid port. Elevated intraocular pressure is monitored in the early post-operative period and managed topically when needed.
How to Maximize Your Safety
1. Choose a practice that performs comprehensive pre-operative screening — corneal topography, tomography, pachymetry, wavefront analysis. 2. Follow all pre-operative instructions — stop contact lens wear, avoid eye makeup, disclose all medications. 3. Choose an experienced surgeon with documented outcomes data. 4. Follow all post-operative instructions precisely — drops, activity restrictions, and follow-up appointments are not optional.
Our LASIK Surgery Awards and EVO ICL Awards identify practices with documented excellence — a useful starting point for finding a surgeon whose outcomes data reflect genuine commitment to safe, high-quality care.
Related Resources
- What Is the Best Vision Correction Surgery?
- Can I Get Vision Correction If I Have Dry Eyes?
- How Do I Know If I’m a Candidate for Any Vision Correction?
*This content is educational and does not constitute medical advice.*