Am I a LASIK Candidate? The Screening Questions That Matter

A candidacy guide built around stable refraction, corneal health, dry eye, medical history and realistic expectations.

The short version

Use this page as a decision framework, not as a substitute for an eye exam. The safest international comparison is the one that keeps candidacy, surgeon verification and follow-up ahead of price.

Start with candidacy, not destination

Refractive surgery is elective surgery on healthy eyes, so the right comparison starts with medical fit, not airfare or a headline price. LASIK reshapes the cornea under a flap; PRK reshapes the corneal surface without a LASIK flap; SMILE removes a small lenticule through a small incision for selected refractive errors. None of those labels, by itself, tells you which procedure is appropriate for your cornea, prescription, tear film, pupil size, age or long-term eye plan.

The U.S. FDA's patient checklist is a useful neutral baseline even if you plan to have surgery outside the United States. It tells prospective patients to ask about prescription stability, corneal thickness, pupil size, dry eye, medical conditions, medications, the surgeon's experience with the specific laser, follow-up arrangements and realistic limitations. The National Eye Institute likewise emphasizes that candidacy requires a comprehensive eye examination and that some people still need glasses, contacts or additional treatment after surgery.

That gives this site a simple editorial rule: a country can be convenient, affordable and full of experienced ophthalmologists and still be the wrong choice for a particular patient. A good clinic should be willing to say no, to recommend a different procedure, or to delay surgery when the measurements do not support it. That is not a failure of the sales process. It is one of the strongest signals that the medical process is functioning correctly.

What the preoperative work-up needs to accomplish

The preoperative examination is the center of the entire decision. Expect more than a quick glasses prescription. The surgeon or refractive team may evaluate refraction, corneal shape and thickness, ocular surface health, pupil characteristics and other eye findings depending on the procedure and your history. Contact lenses can temporarily alter corneal shape, which is why clinics often instruct patients to stop wearing them before measurements. The correct interval depends on lens type and the surgeon's protocol, so do not invent your own timeline.

If your prescription has changed recently, tell the clinic. The FDA lists refractive instability as a major reason to slow down, particularly in younger adults and in situations where hormones, disease or medications can change refraction. Pregnancy and breastfeeding deserve specific discussion because refractive measurements can fluctuate. Previous eye surgery, keratoconus, significant dry eye and some systemic conditions also change the analysis.

International travel makes it especially important to send accurate records before buying a nonrefundable ticket. Remote screening can tell a clinic that a trip is plausible; it cannot replace the in-person measurements needed to clear an eye for surgery. Treat “pre-approved from a WhatsApp photo” as marketing, not as final medical clearance.

Risks that should stay in the conversation

Most patients pursue refractive surgery because they want less dependence on glasses or contact lenses, and many are satisfied with the result. But “common and successful” is not the same thing as “risk free.” The FDA lists possible problems including under- or over-correction, glare, halos, double vision, reduced low-contrast vision, dry eye, infection, flap-related complications and, rarely, severe loss of vision. Some patients still need glasses or an enhancement.

One of the reasons good screening matters is postoperative corneal ectasia, a progressive weakening and bulging of the cornea that can occur after refractive surgery. A systematic review reported ectasia after LASIK, PRK and SMILE, with different reported rates and important limitations in the available evidence. The practical takeaway for a traveler is not to calculate your personal probability from a population paper. It is to insist that the clinic evaluate corneal shape, thickness and other risk factors and explain why the proposed procedure preserves an acceptable structural margin.

Night-vision symptoms and dry eye deserve special attention because they can matter enormously to quality of life even when a standard eye chart looks good. If you drive at night for work, work in aviation or another safety-sensitive occupation, or already struggle with glare, make those priorities explicit before anyone discusses a surgery date.

Dry eye can change both comfort and measurements

Dry eye is not a footnote in refractive surgery. The FDA warns that LASIK can aggravate existing dry eye and that some patients can develop chronic symptoms after surgery. A published study of LASIK candidates found a substantial burden of ocular-surface abnormalities before surgery, underscoring why a clinic should examine the tear film and eyelids rather than treating “my eyes feel fine” as a screening test.

If you already use artificial tears, have contact-lens intolerance, experience fluctuating vision, wake with irritated eyes, or have blepharitis or meibomian-gland problems, disclose it. A good refractive practice may treat the ocular surface first and repeat measurements once it is more stable. That can feel like a delay when you have flights in mind, but measurements taken through an unhealthy tear film can be less reliable.

Travel adds environmental variables: air-conditioned hotel rooms, long flights, reduced sleep, dehydration and unfamiliar pharmacies can all make postoperative comfort harder. Pack the drops the surgeon instructs you to use, keep the clinic's emergency contact information, and avoid assuming you can substitute a different product because a bottle at the pharmacy “sounds similar.”

Corneal shape can stop the plan

Keratoconus and suspicious corneal shape are central screening issues because corneal laser surgery removes or rearranges tissue from a structure that must remain mechanically stable. The FDA lists keratoconus and thin corneas among reasons LASIK may not be appropriate. Modern screening uses corneal mapping and other measurements to look for patterns that may increase concern.

If one clinic tells you the cornea looks suspicious and another says “no problem” without explaining the discrepancy, pause. Ask for copies of the maps and measurements and consider an independent corneal specialist's opinion. International travel makes second opinions easier to skip because of scheduling pressure; that is exactly when the second opinion may be most valuable.

Do not assume that an add-on such as corneal cross-linking automatically converts a marginal LASIK candidate into a safe candidate. Combination strategies exist, but whether they are appropriate is a specialist medical question, not a package upgrade.

Use the same decision sequence for every clinic

The most useful decision is rarely “Which country is cheapest?” A better sequence is: Which procedures am I medically eligible for? Which surgeons can document their qualifications? Which clinic can explain the diagnostic data? Which follow-up plan still works after I leave the country? Then what does the complete plan cost? That order prevents price from doing work that corneal tomography, refraction and a surgeon-patient discussion are supposed to do.

Ask each clinic to send enough information that two offers can actually be compared. At minimum: proposed procedure, technology or laser platform, surgeon name, what testing is included, whether both eyes are treated the same day, medication plan, first-day and first-week follow-up, enhancement policy, exclusions, cancellation terms and the final quoted total. If a clinic will only discuss “packages” but will not put the medical plan in writing, you do not yet have a comparable quote.

It is also reasonable to compare the option of doing nothing. Glasses and contact lenses have costs and inconveniences, but refractive surgery is not medically necessary for most people considering it. The FDA explicitly warns against guarantees and high-pressure advertising. A clinic that gives you room to think, answers technical questions and does not treat a deposit as an emergency is easier to evaluate than one that tries to close the trip before it has your measurements.

A disciplined way to use this guide

Start a simple comparison sheet before you contact clinics. Put Am I a LASIK Candidate? The Screening Questions That Matter at the top and create columns for the questions that matter to you personally. That may include night driving, recovery speed, willingness to spend extra days abroad, comfort with a flap procedure, history of contact-lens intolerance, future reading-vision concerns, or the need to return to safety-sensitive work. Ranking those priorities before a sales coordinator calls you makes it harder for a promotion to redefine what “best” means.

Next, separate facts into three buckets: facts that can be independently verified, facts that require an eye examination, and facts that are merely marketing claims. Professional registration belongs in the first bucket. Corneal thickness, tear-film status and procedure eligibility belong in the second. “Most advanced,” “premium,” “guaranteed,” and similar adjectives belong in the third until the clinic explains exactly what they mean. This sorting exercise is simple, but it prevents very different types of information from being treated as equally trustworthy.

Finally, write down what would make you postpone the decision. Examples include a surgeon who will not explain why LASIK is preferred over PRK or SMILE, measurements that are not stable, an unresolved dry-eye problem, a quote that changes materially after arrival, or a follow-up plan that requires you to leave before the surgeon is comfortable. An elective procedure gives you the luxury of stopping. Use it.

Where to go next

Keep the regional comparison here on LatamLASIK, use LASIKInternational.com when you want a broader global comparison, and use GetMedicalQuotes.com if you already have a written quote that needs to be compared line by line.

Frequently asked questions

Research sources

• FDA LASIK Surgery Checklist
• FDA: LASIK risks and choosing a doctor
• FDA: What to expect before, during and after LASIK
• FDA: When LASIK may not be for you
• National Eye Institute: Surgery for refractive errors
• Study: dry-eye disease among LASIK candidates
• Systematic review: ectasia after corneal refractive surgery