Content is educational and is not a substitute for an examination by a qualified ophthalmologist.
Six procedures, twelve categories, and no winner, because the honest answer is that the right procedure depends on measurements, not on a table. What the table can do is show you exactly where the differences are, so you know what to ask about.
SMILE and LASIK both correct short-sightedness and astigmatism, and both report high patient satisfaction. The difference: LASIK creates and replaces a hinged flap, while SMILE removes a lenticule through a small incision and leaves no flap. Which suits you depends on your corneal measurements, tear film, prescription and your surgeon's assessment, not on a general claim that either is better.
Any source that declares one of these procedures best for everyone is describing a commercial position. We do not rank them, and a clinic should not either.
Select the procedures you want to compare. Every cell is a description of a difference; there are no winner markers, no colour-coded superiority and no scores, because none of those would survive contact with an individual patient.
Add or remove a procedure to narrow the table. On a phone the table becomes a set of stacked cards: swipe any wide table sideways.
| Category | SMILE Pro Short-sightedness and astigmatism, where the cornea and tear film are suitable | SMILE Short-sightedness and astigmatism, where the cornea and tear film are suitable | Femto LASIK A wide range of prescriptions, including long-sightedness | Traditional LASIK Similar prescriptions to femto LASIK, but many clinics have moved to a laser-created flap | PRK Thin corneas, some irregular surfaces, and patients for whom a flap is not advisable | Trans-PRK Similar situations to PRK |
|---|---|---|---|---|---|---|
| What the procedure does All of these procedures change the curvature of the cornea so that light focuses more accurately on the retina. They differ in which layer of the cornea is reshaped and how the surgeon reaches it. | Removes a lenticule of tissue from inside the cornea | Removes a lenticule of tissue from inside the cornea | Removes tissue from beneath a hinged flap using an excimer laser | Removes tissue from beneath a hinged flap using an excimer laser | Removes tissue from the surface of the cornea using an excimer laser | Removes tissue from the surface of the cornea using an excimer laser |
| Corneal flap This is the central structural difference between the techniques, and most practical differences follow from it. A flap must be created, folded back and repositioned; SMILE and PRK do not require one. | None. No flap is created | None. No flap is created | Yes: laser-created hinged flap | Yes: mechanically created hinged flap | None, but the surface layer is removed and must regrow | None, but the surface layer is removed and must regrow |
| Laser technology SMILE uses one laser for the whole procedure. LASIK and PRK typically use two devices: one to create access and one to perform the correction. Platform generation matters more than brand names on a brochure. | One femtosecond laser (newer platform generation) | One femtosecond laser (earlier platform generation) | Femtosecond laser plus an excimer laser | Mechanical microkeratome plus an excimer laser | Excimer laser | Excimer laser (single step) |
| How the surgeon gets access The size and number of incisions affect how much of the corneal nerve network is disrupted, which is directly relevant to dry eye afterwards. | One small incision | One small incision | A flap cut around most of its circumference, with a hinge left intact | A flap cut around most of its circumference, with a hinge left intact | The outer surface layer is removed across the treatment zone | The outer surface layer is removed by the laser across the treatment zone |
| Early recovery Comfort in the first day or two differs noticeably between surface ablation and the other techniques. Visual recovery is quicker than surface healing, and refraction continues to settle for weeks afterwards in every case. | Often comfortable quickly; vision fluctuates while settling | Often comfortable quickly; vision fluctuates while settling | Often comfortable quickly; vision fluctuates while settling | Often comfortable quickly; vision fluctuates while settling | Surface must regrow, so the early period is typically more uncomfortable | Surface must regrow, so the early period is typically more uncomfortable |
| Dry-eye considerations Every one of these procedures cuts corneal nerves, so every one of them can cause dry eye. The published evidence generally favours the small-incision approach on early corneal sensation and dry-eye measures, but individual studies disagree and it is not a guarantee. | Discussed in the literature as favourable on early corneal sensation Read more | Discussed in the literature as favourable on early corneal sensation Read more | More disruption to corneal nerves reported in several studies Read more | More disruption to corneal nerves reported in several studies Read more | Surface healing is slow; dryness is common early on Read more | Surface healing is slow; dryness is common early on Read more |
| Prescriptions commonly treated Treatable prescription ranges depend on the platform, your corneal thickness and your surgeon’s judgement. We do not publish ranges in numbers, because a range taken from one surgeon’s practice does not transfer to another. | Short-sightedness and myopic astigmatism | Short-sightedness and myopic astigmatism | Short-sightedness, long-sightedness and astigmatism | Short-sightedness, long-sightedness and astigmatism | Short-sightedness, long-sightedness and astigmatism | Short-sightedness, long-sightedness and astigmatism |
| Astigmatism correction Astigmatism has both an amount and a direction, so alignment matters. Ask how alignment is confirmed for your eye and what your surgeon’s own residual astigmatism outcomes look like. | Yes: myopic astigmatism. Newer platforms include rotational alignment features | Yes: myopic astigmatism | Yes, including astigmatism without short-sightedness | Yes, including astigmatism without short-sightedness | Yes, including astigmatism without short-sightedness | Yes, including astigmatism without short-sightedness |
| Procedure-specific risks All refractive procedures share a set of risks: infection, inflammation, under- or over-correction, dry eye, night vision symptoms. Some risks are specific to how access is gained. | Interface inflammation; suction loss during the laser phase | Interface inflammation; suction loss during the laser phase | Flap complications, including flap displacement and epithelial ingrowth | Flap complications, plus risks associated with a mechanical cut | Delayed surface healing, haze and early discomfort | Delayed surface healing, haze and early discomfort |
| Follow-up pattern The schedule is broadly similar across techniques: an early check, then further appointments over the first months. What differs is what the surgeon is specifically looking for. | Early review, then appointments while refraction settles | Early review, then appointments while refraction settles | Early review including flap position, then follow-up as refraction settles | Early review including flap position, then follow-up as refraction settles | Early reviews while the surface heals, then follow-up as refraction settles | Early reviews while the surface heals, then follow-up as refraction settles |
| Cost Cost is driven by the clinic, the surgeon, the platform, what is included in the package and the local market, not by the technique alone. Compare itemised quotes, not totals. | Quoted per clinic; often positioned as a premium option Read more | Quoted per clinic Read more | Quoted per clinic; widely offered, so pricing is competitive Read more | Quoted per clinic; often the least expensive flap technique Read more | Quoted per clinic; frequently the least expensive option Read more | Quoted per clinic; frequently the least expensive option Read more |
| Long-term considerations Long-term vision depends much more on your eyes and your age than on which technique was used. Two questions are worth asking on the day of assessment because they are hard to revisit afterwards. | Enhancement is possible but structurally different, as there is no flap to lift | Enhancement is possible but structurally different, as there is no flap to lift | An existing flap can often be lifted for a later enhancement | An existing flap can often be lifted for a later enhancement | A further surface treatment is possible on the cornea | A further surface treatment is possible on the cornea |
Individual results vary, and this table is general education rather than medical advice. Read the medical disclaimer.
A comparison table describes groups of patients, not your eyes. It is a tool for generating questions, not for reaching a conclusion. When a cell says something varies, that is because it genuinely does, and the person who can resolve it for you is the one holding your topography scan.
This is the comparison most patients ask about, and the one where the answer is least tidy. Every one of these procedures cuts corneal nerves, because every one of them involves cutting the cornea. That disruption affects the feedback loop that keeps the ocular surface comfortable and moist, so all of them can cause dry eye.
Pooled analyses and reviews generally report more favourable early results for corneal sensation and dry-eye measures after small-incision lenticule extraction than after femtosecond LASIK, with sensation recovering sooner in the SMILE groups in several meta-analyses. That is a real signal, and it is one reason a surgeon may prefer a small-incision approach for a patient with a borderline ocular surface.
It is not a guarantee. The published literature is not unanimous, individual studies disagree, and plenty of patients report dryness after SMILE. Having a favourable position in the literature is not the same as being risk-free, and we would rather say that plainly than overstate a meta-analysis.
More on dry eye as a side effect
Both reshape the cornea and both correct short-sightedness and astigmatism. The difference that everything else flows from is that LASIK lifts a flap and SMILE does not.
| Category | SMILE Pro | LASIK |
|---|---|---|
| Access to the tissue | A small incision, with the outer corneal surface left largely intact | A hinged flap is cut, folded back, and repositioned at the end |
| Laser used | A single femtosecond laser performs the whole procedure | A femtosecond or mechanical device creates the flap, then an excimer laser reshapes the cornea |
| Corneal nerves | Fewer nerves are cut because the incision is small, which is why dry-eye measures often look better early on | A flap cuts across more of the nerve network, which is why dryness is a well-documented early feature |
| If a further procedure is needed | No flap exists, so enhancement requires a different approach, sometimes a surface treatment | The existing flap can often simply be lifted and the cornea re-treated |
| Prescriptions | Established for short-sightedness and myopic astigmatism | Broader range, including long-sightedness |
Your surgeon judges that a small-incision approach suits your cornea and tear film, and no flap-free access is a specific advantage for you: for example where dry eye or a lifestyle with impact risk is a consideration.
You need a prescription corrected that lenticule extraction does not routinely treat, or the surgeon believes the ability to lift a flap later for an enhancement is a meaningful advantage in your case.
Neither column is a recommendation. Which procedure suits you depends on measurements that can only be taken in a clinic, and a surgeon who tells you one option is right for everyone is describing their product, not your eyes.
Femto LASIK is the laser-flap version of LASIK. It removes the mechanical blade from the process but keeps the flap, so the comparison with SMILE is essentially the flap comparison with a modern access technique.
| Category | SMILE Pro | Femto LASIK |
|---|---|---|
| Flap | No flap is created | A flap is created by laser, then repositioned |
| Devices involved | One platform | Two platforms: one for the flap, one for the correction |
| Flap-related complications | Not applicable, because there is no flap | Flap displacement and epithelial ingrowth are recognised, though uncommon, risks |
| Enhancement | Structurally different, as there is no flap to lift | A repeat treatment can often be done by lifting the existing flap |
You and your surgeon decide that a small-incision approach is preferable for your cornea, ocular surface or lifestyle.
Your prescription falls outside what lenticule extraction routinely treats, or you value the future option of lifting a flap.
Neither column is a recommendation. Which procedure suits you depends on measurements that can only be taken in a clinic, and a surgeon who tells you one option is right for everyone is describing their product, not your eyes.
These are the two main flap-free options, but they are flap-free in different ways. SMILE works inside the cornea through a small incision; PRK removes the surface layer and reshapes what is underneath.
| Category | SMILE Pro | PRK |
|---|---|---|
| What happens to the surface | Left largely intact apart from the incision | Removed across the treatment zone, and must regrow |
| Early comfort | Often comfortable relatively quickly | Typically more uncomfortable while the surface regenerates |
| Suitable corneas | Requires adequate corneal thickness for a lenticule | Often considered for thinner corneas where a lenticule is not advisable |
| Haze risk | Not a characteristic concern | A recognised consideration after surface ablation |
Your cornea is thick enough for lenticule extraction and you want a procedure that leaves the surface largely undisturbed.
Your cornea is thin, or the surface itself needs to be addressed: a situation where a surface technique may be the safer option, even though it is uncomfortable for longer.
Neither column is a recommendation. Which procedure suits you depends on measurements that can only be taken in a clinic, and a surgeon who tells you one option is right for everyone is describing their product, not your eyes.
Traditional LASIK uses a mechanical blade to create the flap rather than a laser. Many clinics have moved away from it, but it is still offered in some settings, so it is worth understanding how it differs.
| Category | SMILE Pro | Traditional (microkeratome) LASIK |
|---|---|---|
| Flap creation | No flap at all | A mechanical microkeratome cuts a hinged flap |
| Variability of the cut | Not applicable | A mechanical cut is generally considered less predictable in thickness than a laser cut |
| Cost | Often positioned at the higher end of a clinic’s price list | Frequently the lower-priced flap option |
| Devices in the theatre | One platform | A microkeratome plus an excimer laser |
A flap-free approach is preferred for your eye or your circumstances.
A laser-created flap or a lenticule is not an option for you, and your surgeon considers a mechanical flap acceptable, though many surgeons would now choose a laser-created flap instead.
Neither column is a recommendation. Which procedure suits you depends on measurements that can only be taken in a clinic, and a surgeon who tells you one option is right for everyone is describing their product, not your eyes.
Third-party video Mayo Clinic ophthalmologist Leo Maguire explains how laser vision correction reshapes the cornea to correct focus. It is about LASIK rather than SMILE, which is the point in this position: the comparison page should not be framed solely in one manufacturer vocabulary. Watch on YouTube (opens in a new tab)
Long-term vision depends far more on your eyes and your age than on which technique was used. But four things are easier to ask about now than to revisit afterwards.
Surgery freezes your refraction at a point in time. It does not stop age-related changes. Reading vision changes for almost everyone at some point, and cataract can develop later in life regardless of whether you have had refractive surgery.
Ask: How will this affect my reading vision as I get older, and what would I notice first?
Not every eye lands exactly on the intended result. A small residual is common and is often tolerated easily, but it can mean wearing glasses for some tasks, or considering a further procedure.
Ask: What is your enhancement policy, and how often do your patients need one?
Refractive surgery changes how corneal thickness and eye pressure read. That matters for later conditions such as glaucoma, and for accurately calculating lens implants if you ever need cataract surgery.
Ask: Will you give me a copy of my preoperative measurements and my operative record?
The visits that matter most are often not the ones in the first fortnight. If a clinic’s relationship with you ends after the one-month check, that is worth knowing before you pay.
Ask: What follow-up is included, for how long, and who do I see after that period ends?
In a well-run clinic, the procedure choice falls out of the measurements rather than being selected from a menu. The sequence usually looks like this:
If a clinic arrives at step five without having done one through three, you have your answer about the clinic, whatever it says about your eyes.
A flap procedure against a flapless one. The difference readers care about is what happens to the surface of the eye, not which laser is better.
The current lenticule platform against the flap-based standard: what the platform generation changes, and what having a flap changes for good.
A flap against a surface treatment. The clinical difference is tissue and recovery rather than result, which is why PRK is still used where the cornea is thin.
Both leave the surface of the eye intact in different ways: one through a small incision, one by removing the surface layer and letting it regrow. The first week is the main difference.
No single procedure is better for everyone. SMILE and LASIK both correct short-sightedness and astigmatism and both report high patient satisfaction. They differ in how the cornea is accessed, in the early recovery profile, and in how a re-treatment would be performed later.
Which is appropriate depends on your measurements, your tear film, your lifestyle and your surgeon’s assessment. Any clinic that tells you one procedure is the best choice for everybody is selling rather than assessing.
Sources Peer-reviewed literature (via PubMed Central) , StatPearls, NCBI Bookshelf
LASIK creates a hinged flap in the cornea, folds it back, removes tissue with an excimer laser and replaces the flap. SMILE removes a lenticule of tissue through a small incision inside an intact cornea, leaving no flap. The presence or absence of a flap is the structural difference from which most other differences follow.
In plain terms: LASIK opens the cornea like a book, works inside it and closes it again. SMILE takes a small piece out through a keyhole. Both change the shape of the cornea, and both involve cutting it.
Sources StatPearls, NCBI Bookshelf , StatPearls, NCBI Bookshelf
Both perform lenticule extraction. SMILE Pro is the same procedure performed on the newer ZEISS VISUMAX 800 platform instead of the earlier VISUMAX generation, which the manufacturer describes as faster and as including automated centration and rotation-compensation features.
The practical difference for a patient is mostly about workflow and how the clinic verifies alignment, not about a change in the optical principle of the surgery.
The comparison evidence between the two generations is still limited and comes mainly from individual clinical studies rather than pooled analyses, so it should not be treated as settled. If a clinic charges a premium for "Pro", ask what platform is installed, and ask to see their own outcome data.
Sources ZEISS Medical Technology , Peer-reviewed literature (via PubMed Central)
Yes, no flap is created. The surgeon reaches the lenticule through a small incision rather than by lifting a layer of the cornea. The cornea is still cut, and tissue is still removed, so "flapless" describes the access route rather than the absence of surgery.
This distinction matters because "flapless" is sometimes used in marketing to imply that nothing structural happens to the cornea. That is not accurate. What changes is that there is no hinged flap to reposition, and no flap to displace later.
Sources StatPearls, NCBI Bookshelf , StatPearls, NCBI Bookshelf
It can. Any refractive procedure involves cutting corneal nerves, which affects the feedback loop that keeps the ocular surface comfortable and moist. Published evidence suggests early dry-eye signs and symptoms are generally less pronounced after SMILE than after flap-based LASIK, but the literature is not unanimous and many patients still experience dryness.
Most people who develop dryness after surgery find it improves over the first months. For a minority it is persistent. If you already have dry eye, that is a conversation your assessment should address directly rather than gloss over.
Sources Journal of Ophthalmology (via PubMed Central) , Peer-reviewed literature (via PubMed Central) , Peer-reviewed literature (via PubMed Central)
Refractive surgery permanently changes the shape of the cornea, but it does not stop your eyes from changing over your life. Later changes include presbyopia, which affects reading vision and eventually affects everyone regardless of surgery, and the development of cataract.
A small residual or a later shift in prescription is also possible. Ask your surgeon what follow-up they offer over the years rather than only in the first month, because that is where long-term care actually matters.
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We prefer primary sources. Where a claim comes from a manufacturer, a single study or a regulator, it is labelled as such below.
A continuously updated clinical reference chapter covering SMILE indications, technique, outcomes and complications, written for clinicians.
Used for How the lenticule is created and removed; Indications and contraindications; Complication categories; Corneal biomechanics compared with flap-based surgery.
Link checked 22 September 2026
The equivalent clinical reference chapter for LASIK, used so that comparisons describe both procedures symmetrically.
Used for How LASIK creates and manages a corneal flap; LASIK complication categories.
Link checked 22 September 2026
A meta-analysis pooling several studies on dry eye after SMILE compared with femtosecond LASIK. It also documents where the included studies disagreed.
Used for The dry-eye discussion on the comparison and risks pages; Explaining that the evidence base is mixed rather than unanimous.
Link checked 22 September 2026
A meta-analysis of corneal sensitivity and dry-eye measures after SMILE compared with femtosecond LASIK, generally finding faster recovery of sensation in the SMILE group in the early postoperative period.
Used for Corneal sensation and dry-eye timing discussions.
Link checked 22 September 2026
A review of dry eye after LASIK, including the mechanisms involved and how other procedures compare in the published literature.
Used for Balanced comparison of dry-eye risk between procedures.
Link checked 22 September 2026
A comparative study of three commonly used refractive procedures, including a summary of proposed advantages of each.
Used for The procedure comparison page, particularly the PRK discussion.
Link checked 22 September 2026
The manufacturer’s own product page for the femtosecond laser platform used for SMILE pro.
Used for What describes the technology behind SMILE pro; The distinction between SMILE and SMILE pro; Claimed workflow features such as automated centration.
Link checked 22 September 2026
These pages go deeper on the questions that usually follow this one.