Deciding Whether SMILE Vision Correction Fits Your Needs

SMILE Fit at a Glance

Start with the decision, not the device

SMILE is a surgical option intended to reduce or eliminate myopia with or without astigmatism.¹ The key question is not simply whether it can treat a prescription. The better question is whether its benefits, limits, and risks fit your eyes and your goals.

Small incision lenticule extraction (SMILE) uses a laser to create a thin piece of tissue inside the cornea. A surgeon removes that tissue through a small incision to change the cornea's focusing power.¹ Unlike laser-assisted in situ keratomileusis (LASIK), SMILE does not make a larger corneal flap.²

This page can help you prepare for a consultation. FDA labeling requires a comprehensive eye examination and diagnostic testing before SMILE eligibility is determined.¹

Use a four-part fit screen

A sound decision answers four questions:

1. Eligibility: Does your age, prescription, and recent prescription history meet the approved criteria where you live?
2. Safety: Are your cornea, tear film, retina, eye pressure, and general health suitable for elective corneal surgery?
3. Goals: Would reducing dependence on glasses be worthwhile even if you still need glasses for some tasks?
4. Tradeoffs: Are you comfortable with a permanent procedure and the chance of side effects or further correction?

A “yes” to one question does not settle the others. Use all four answers when you talk with the surgeon. For a related symptom pattern, read Deciding Whether a Phakic Intraocular Lens Is Right for You.

The short decision rule

A consultation should test each part of the four-part screen. If one part does not fit, ask whether it is safer to wait, choose another option, or keep using glasses or contacts. You can compare this topic with Deciding Whether a LASIK Enhancement Is Appropriate.

The most useful consultation is with an ophthalmologist who can explain why SMILE fits better than the alternatives for your measurements. If only one procedure is discussed, ask how the same eyes would be evaluated for LASIK, surface ablation, glasses, or contact lenses. For another care decision in this area, see Vision Changes around Pregnancy after Refractive Surgery That Need Care.

The Core Fit Questions

Do you meet the approved age and prescription criteria?

For the U.S. Food and Drug Administration (FDA)-labeled VisuMax indication, patients must be at least 22 years old.¹ The labeled range is -1.00 to -10.00 diopters of myopia and -0.75 to -3.00 diopters of astigmatism, with the combined myopia and astigmatism no more than -10.00 diopters.¹

FDA labeling requires a comprehensive examination and diagnostic testing before eligibility is determined.¹ Ask the surgeon which exact device and approval apply to you.

Has your prescription been stable?

The U.S. FDA label requires nearsightedness and astigmatism to have changed by no more than 0.50 diopter during the year before surgery.¹ Bring older prescriptions if you have them. The clinician can compare them with the examination rather than relying on memory.

Tell the clinic about contact-lens wear, pregnancy, medication changes, and ocular-surface symptoms when booking. Ask whether any of them changes how you should prepare for the examination.

Are your visual goals realistic?

FDA patient labeling says SMILE does not guarantee perfect vision and that some people may still need glasses for activities such as night driving or reading.¹ Decide what success would mean before you compare procedures. “Less dependent on contacts for daily life” is a different goal from “never wear glasses again.”

SMILE does not correct presbyopia, the age-related loss of near focusing, so reading glasses may still be needed.¹ If near vision matters to your work or hobbies, ask how the plan affects distance and near tasks now and as you age.

Does the procedure match your priorities?

Because SMILE does not create a corneal flap, a clinical review identifies it as a possible consideration for people involved in contact sports or otherwise at risk of flap displacement.² That feature alone does not decide which option fits you.

Write down the tasks you care about: driving at night, screen work, fine near work, swimming, contact sports, travel, or shift work. Then ask the surgeon to connect each task to the expected recovery, restrictions, and optical tradeoffs of every reasonable option.

Reasons to Wait or Choose Another Option

Corneal shape and tissue can rule SMILE out

FDA labeling lists insufficient corneal tissue and abnormal corneal shape, including keratoconus, as contraindications to SMILE.¹

Ask the surgeon to show you the corneal maps and explain the tissue calculation in plain language.

Dry eye, infection, or inflammation may stop the plan

The FDA label contraindicates SMILE in severe dry eye and in active eye infection or inflammation.¹ If your eyes burn, fluctuate, feel gritty, or need frequent drops, mention that before measurements are taken.

Do not treat a screening visit as a deadline. If the surgeon recommends stabilizing the ocular surface or resolving an active problem first, ask what finding needs to improve and how candidacy will be reassessed.

Some health conditions are contraindications; others require judgment

FDA labeling contraindicates SMILE in active autoimmune or connective-tissue disease, uncontrolled diabetes, and uncontrolled glaucoma.¹ The same labeling directs the surgeon to weigh benefits and risks individually for controlled autoimmune or connective-tissue disease, controlled diabetes, immune compromise, a history of herpes infection affecting the eye, controlled glaucoma, or isotretinoin use.¹

FDA patient labeling requires a thorough medical and eye history before SMILE.¹ Include non-eye medicines and supplements, and ask the clinician who prescribed a medicine before making any change.

Pregnancy, nursing, and changing measurements can mean “not now”

FDA patient labeling treats pregnancy or nursing as a precaution because refractive results may be less predictable during those periods.¹ Ask when the surgeon would consider measurements dependable and what evidence of stability the clinic wants.

If any result changes between visits, the right response is to investigate the change, not to force the original plan. Elective timing should follow stable information.

What the Consultation Must Settle

Expect more than a vision-chart check

FDA patient labeling calls for a comprehensive eye examination, a thorough medical and eye history, examination of both eyes, and diagnostic testing to determine eligibility.¹ Ask the surgeon to explain what each measurement adds to the decision.

Ask what the examination showed about the refraction, cornea, ocular surface, retina, and eye pressure. Then ask which finding is most likely to change the recommendation.

Prepare correctly if you wear contact lenses

Contact lenses must be stopped before the preoperative examination for a period chosen by the doctor so that stable measurements can be obtained.¹ Get that interval directly from the clinic.

Do not guess or use a generic internet schedule. Tell the clinic exactly what type of lenses you wear, how often you wear them, and when you last wore them. If measurements are inconsistent, ask whether they should be repeated on another day.

Ask for an eye-by-eye recommendation

Ask for the proposed treatment and the reasons for each eye. If the answer is “SMILE,” ask which findings favored it and which findings argued against LASIK or surface ablation.

A high-quality consent discussion should cover the likely benefit, plausible downsides, alternatives, what no surgery would mean, and how unexpected residual prescription would be handled. Take notes or bring a written question list.

Do not schedule until the enhancement plan is clear

A systematic review described surface ablation, conversion of the SMILE cap into a flap, and thin-flap LASIK as enhancement approaches after SMILE, with different patient-specific tradeoffs.³ Ask which, if any, of those methods the clinic would consider for your eyes.

Ask what the clinic would do if meaningful blur remained after healing. Also ask who pays for extra testing or treatment, how long the clinic follows patients, and when an enhancement would be considered. These are decision terms, not afterthoughts.

How SMILE Changes the Cornea

The laser creates a lenticule inside the cornea

During SMILE, the femtosecond laser makes a disc-shaped lenticule within the cornea and a small access incision; the surgeon removes the lenticule through that opening, changing the cornea's focusing shape.¹

This explanation is useful for comparing procedures, but it is not a surgical plan. Ask the surgeon to connect the measurements and device plan to the proposed treatment.

“Flapless” describes anatomy, not an absence of risk

SMILE is described as flapless because it does not create a LASIK-style flap.² Treat that word as a design description, not as a promise about outcome or risk.

FDA labeling states that SMILE is permanent and cannot be reversed.¹ Consent should therefore focus on whether the expected benefit is worth the procedure-specific and general refractive-surgery risks.

Your role during surgery still matters

FDA patient instructions say the eye is numbed with drops, an eyelid holder is used, light suction is applied, and the patient must keep looking at the fixation light while the laser treatment is delivered.¹ Tell the surgeon beforehand if lying flat, keeping still, or following a fixation target may be difficult.

Ask what you may see or feel and what the team wants you to do if you become anxious. A clear rehearsal can make the day less uncertain.

SMILE, LASIK, or Another Route?

SMILE and LASIK have overlapping goals but different tradeoffs

A meta-analysis of 17 randomized studies found similar pooled efficacy, safety, stability, predictability, and higher-order aberration outcomes for SMILE and other corneal refractive operations.⁴ The same review found less effect on corneal sensation and corneal nerve density after SMILE.⁴

A separate meta-analysis of 11 randomized trials found broadly comparable safety and efficacy for SMILE and LASIK, but a higher proportion of LASIK-treated eyes ended within 0.50 diopter of the intended refraction.⁵ Ask how those group results apply to your corneal map, prescription, dry-eye status, and priorities.

Astigmatism deserves a specific discussion

A review of 17 studies found generally similar visual-acuity and refractive outcomes for SMILE and LASIK in astigmatism correction, but reported a tendency toward undercorrection with SMILE.⁶ The authors judged the risk of bias to be moderate in most included studies.⁶

If astigmatism is a large part of your prescription, ask the surgeon to discuss the expected accuracy for your pattern, not only the overall prescription range. Also ask how residual astigmatism would affect the enhancement plan.

Surface ablation, glasses, and contacts remain real options

FDA patient information lists glasses, contact lenses, photorefractive keratectomy (PRK), LASIK, and certain lens-based procedures among alternatives to SMILE.¹

If you prefer not to have surgery, ask what continued use of glasses or contacts would involve. Ask for a separate consent discussion for every surgical alternative. Use the same goals and constraints for each comparison.

Tradeoffs to Accept Before Saying Yes

The target is improvement, not certainty

Possible outcomes in FDA patient labeling include undercorrection, overcorrection, increased astigmatism, and loss of lines of best-corrected vision.¹ The labeling also warns that vision may not be perfect after SMILE.¹

Ask for the surgeon's own audited results for patients similar to you, including how outcomes are defined and how much follow-up is available. A percentage is useful only when you know the starting prescription, endpoint, sample size, and time point.

Visual quality and comfort may change

FDA labeling lists dry-eye symptoms, glare, halos, starbursts, blurred or fluctuating vision, focusing difficulty, and difficulty driving at night among possible problems after SMILE.¹ Ask which of these risks matters most for your baseline symptoms and daily tasks.

Do not reduce the discussion to visual acuity on a bright chart. Night driving, contrast, comfort, and consistency across the day may matter just as much to your satisfaction.

Rare complications can be serious

FDA patient labeling identifies rare complications such as corneal scarring, swelling, cloudiness, irregularity or ectasia, as well as infection and inflammation; some complications can cause vision loss that glasses or contacts do not correct.¹

Ask the surgeon to separate common temporary effects from uncommon lasting harm. Also ask how the clinic prevents, detects, and manages complications. The purpose is informed consent, not a promise that every event is preventable.

Plan for the possibility of more correction

Avoid treating “touch-up” as a complete plan. Ask what amount of remaining prescription would be watched, corrected with glasses, or considered for another operation.

Make sure the answer includes timing, repeat measurements, tissue limits, expected recovery, added risks, and cost. If the plan is unclear before surgery, it will not become simpler after an unexpected result.

When to Contact an Eye Doctor

Call before surgery when your health or vision changes

Active eye infection or inflammation is an FDA contraindication to SMILE.¹ If information from your medical or eye history changes before the procedure, tell the surgical team and let it decide whether the examination or surgery should be rescheduled.

Also call if you cannot follow the contact-lens break or other preparation instructions. Tell the clinic rather than keeping the chosen date without disclosing the change.

Contact the surgeon promptly after surgery for pain or vision change

FDA patient instructions say to contact the doctor for any pain, change in vision, or loss of vision after SMILE because these can signal a serious medical condition.¹ Use the surgeon's after-hours number if the office is closed, and follow the clinic's instructions for urgent care if the team cannot be reached.

Report pain, a change in vision, or loss of vision to the doctor rather than waiting for a scheduled visit.¹ Bring the procedure details and medication list if another clinician evaluates you.

Keep follow-up even when vision seems good

FDA patient instructions call for follow-up examinations so the doctor can monitor healing.¹ They also direct patients to use prescribed medication drops and lubricants as instructed.¹ Ask the clinic before adding, stopping, or substituting an eye product.

FDA patient labeling says patients should receive a card with their preoperative eye measurements.¹ The labeling also says SMILE can affect the interpretation of eye-pressure measurements and measurements for future cataract surgery, so future eye doctors should be told about the procedure.¹

Common Questions About Choosing SMILE

Questions About Timing and the Consultation

Should I choose the newest laser platform?

A newer platform feature is not, by itself, a reason to have surgery. Ask which device will be used, what approval applies, how the feature changes your procedure, and whether the surgeon has outcome data for patients like you. The clinical fit matters more than a technology label.

How should I compare a clinic's success rate?

Ask for the definition of success, the number of comparable eyes, the follow-up point, and how missing follow-up was handled. Separate uncorrected visual acuity, closeness to target refraction, patient-reported symptoms, complications, and enhancements. One headline percentage cannot represent all of them.

Is a second opinion reasonable?

Yes, especially when the recommendation is borderline, only one procedure is offered, the explanation of corneal findings is unclear, or you feel rushed. Bring copies of your refraction, corneal maps, thickness measurements, ocular-surface findings, and proposed treatment so the second clinician can assess the same evidence.

Questions to Ask Your Doctor

• Which findings make SMILE a better fit for each of my eyes than LASIK, surface ablation, glasses, or contacts?
• Which device and regulatory indication would apply to my treatment?
• Is my prescription stable enough, and did contact-lens wear affect today's measurements?
• What do my corneal maps and tissue calculations show?
• Do I have ocular-surface findings that should be treated or reassessed first?
• What visual result is realistic for my prescription and astigmatism?
• How might the procedure affect night driving, near work, and my future need for reading glasses?
• What symptoms and complications do you see in your own patients, and how are they managed?
• If I have a residual prescription, which enhancement options could fit my eyes?
• What are the follow-up schedule, activity limits, after-hours contact plan, and total expected costs?