PRK vs LASIK vs SMILE — which laser eye surgery is right for you.
These are not four products you pick from a menu. They are four answers to one question your surgeon asks of your cornea — and the screen, not the laser, is what keeps you safe.
LASIK, PRK, SMILE and ICL all correct refractive error, but they distribute the same trade-offs differently: speed of recovery, biomechanical margin, dry-eye profile, and the range of prescriptions they can safely handle. None is universally best.
The decision that matters is not which one you want — it is which one your cornea is a candidate for. That is a screening question (tomography, pachymetry, tear film, refraction stability), and a borderline screen should produce a 'no' to the procedure you asked for and a clean alternative, not a stretched indication.
A network meta-analysis ranks modern techniques at the top of the efficacy ladder for low-to-moderate myopia (Shen 2017), and long-term cohorts confirm the safety profile holds beyond ten years (Taneri 2021). The honest counterweight is that new visual symptoms and dry eye are real, counsellable considerations — not fine print.
Why this is a screening decision, not a shopping decision.
Patients arrive having decided they want SMILE because it is 'flapless', or LASIK because recovery is fast. That is the wrong order of operations. The procedure is chosen by the cornea, not the patient: corneal thickness, tomography pattern, prescription magnitude, tear-film status, and pupil size determine what is safe. The surgeon's job is to read those and tell you which of the four your eye qualifies for.
This is the single most important thing to understand before you book a laser eye procedure abroad: the pre-operative screen is the procedure. The laser step takes seconds; the safety lives in the tomography. A clinic that offers you a technique before it has read your cornea is selling, not screening.
LASIK, PRK, SMILE, ICL — what actually separates them.
LASIK creates a thin corneal flap with a femtosecond laser, then reshapes the bed beneath it. Recovery is fast — functional vision within hours — and it corrects myopia, hyperopia and astigmatism. The trade-off is the flap itself and a higher transient dry-eye signal in the first months.
PRK has no flap: the surface epithelium is removed and regrows. Long-term safety is essentially equivalent to LASIK, and it is the safer choice for thin corneas or borderline tomography — at the cost of several days of real discomfort and a slower visual recovery. SMILE is flapless too, extracting a lenticule through a small incision; it has a marginally gentler dry-eye profile and good biomechanical stability, but it does not correct hyperopia and has less long-horizon data than LASIK.
ICL is the outlier: not a laser at all, but a phakic lens implanted in front of your natural lens. It is the answer for corneas that should not be lasered — very high prescriptions, thin or irregular corneas — and it is reversible. Its specific long-term consideration is endothelial cell loss, which is why it is reserved for the cases that genuinely need it.
| Recovery | Corrects | Best when | Specific trade-off | |
|---|---|---|---|---|
| LASIK | Hours | Myopia · hyperopia · astigmatism | Normal cornea, broad prescription range | Flap; transient dry eye |
| PRK | Days (real discomfort) | Myopia · astigmatism | Thin / borderline cornea | Slower recovery, haze risk |
| SMILE | 1–2 days | Myopia · astigmatism | Dry-eye-prone, myopia-dominant | No hyperopia; less long-term data |
| ICL | 1–2 days | Very high myopia, irregular cornea | Cornea unsuitable for laser | Reversible; endothelial cell loss |
What makes you a candidate — and what makes the answer 'no'.
A clean candidate has a stable refraction (≤0.50 D change in the past year), normal corneal tomography with no keratoconus signature, adequate corneal thickness for the planned ablation, and a healthy tear film. Age 21+ is the usual stability floor.
The answers that should trigger a 'no' — or a redirect to a different technique — are exactly the ones a selling clinic will talk you past: a thin cornea (PRK or ICL instead of LASIK), a borderline or asymmetric tomography (referred away from laser entirely), significant dry eye, or unrealistic expectations about reading glasses after 40. The discipline of screening is saying 'no' to the procedure you asked for when the cornea does not support it.
A mildly asymmetric tomography or a thin residual-bed prediction is where a serious clinic refers you to PRK or ICL — or sends a clean decline. A clinic that offers LASIK anyway is the one to walk away from: post-LASIK ectasia is the rare but serious outcome that screening exists to prevent.
New visual symptoms and dry eye — counselled, not hidden.
The honest part of the conversation is about symptoms. The FDA's prospective patient-reported studies found very high satisfaction overall, but a substantial minority reported a new visual symptom — glare, halo, starburst — at three months, and dry-eye symptoms are a recurrent early complaint that typically improves over six months.
These are not reasons not to have the procedure; they are reasons to be counselled honestly before consent. A randomized contralateral-eye trial (Ma & Manche 2022) found SMILE has a marginally gentler post-operative dry-eye and corneal-sensitivity profile than LASIK — a real but modest difference that factors into the technique choice for a dry-eye-prone patient. Surprise at consent is the failure here, not the symptom itself.
How the decision is made at Hektor.
Every refractive case at Hektor is screened by a refractive surgeon: Pentacam (Scheimpflug) tomography, ocular-surface assessment, manifest plus cycloplegic refraction. The technique is the output of that screen, explained to you with the reason it was chosen over the alternatives — and a borderline screen results in a referral to PRK or ICL, or a clean decline.
We offer all four because the right answer for a thin cornea is not LASIK, and the right answer for a −16 D prescription is ICL, not laser. Same-day, walking out the same calendar day, with a 24-hour video check before you fly home and structured reviews at one week, one month, three months and twelve. The procedure is the easy part; the screen is what we do not compress.