Does LASIK last forever? What the forum myths get wrong

Does LASIK last forever? The corneal reshaping itself doesn't wear off, because the tissue the laser removes doesn't grow back, but the rest of your eye keeps aging: some eyes drift slightly over the years, and most people need reading glasses somewhere in their 40s. Forum threads rarely cover the worry behind the question for anyone flying to Seoul for Clear LASIK: if your vision slips years later, who looks at it once you're back home?

I'm Kim Sun-young, Medical Director at Healing Eye Clinic in Gangnam, and the cornea is the first of my three specialties, alongside glaucoma and cataract.

That second question has a concrete answer here. The policy covers who keeps looking after your eyes; it can't decide how they age.

If you have glasses prescriptions from the last two or three years, photograph them and send them on WhatsApp with the month you're thinking of traveling.

Why can't forum threads agree on whether LASIK wears off?

Two different things get called “wearing off.” One is regression: a little of the original prescription creeps back as the corneal surface remodels or the eye keeps lengthening. The other is new change elsewhere in the eye, such as presbyopia in your 40s or a cataract decades later. A thread rarely says which one the poster had.

The laser part is lasting. In LASIK, a thin flap is created and lifted, an excimer laser reshapes the corneal tissue beneath, and the flap is laid back without stitches. The cornea doesn't rebuild what was removed. What can shift is the thin layer of surface cells (the epithelium), which can thicken slightly over the treated zone, and the length of the eye, which in some people is still creeping when they have surgery.

That second point is why the U.S. Food and Drug Administration lists a change in your glasses or contact lens prescription within the past year as a sign you're likely not a good candidate. The FDA also notes that people in their early 20s or younger are more likely to have refractive instability. A correction built on a prescription that was still moving is one plausible story behind many “mine wore off” posts.

Myth: if someone else's LASIK faded, yours will too

Regression risk isn't spread evenly. It tends to be higher with stronger prescriptions, with thinner corneas, and when the prescription wasn't stable before surgery, so a stranger's drift says little about your own eyes.

A 2016 paper in the Korean Journal of Ophthalmology by Lim and colleagues examined the factors behind long-term myopic regression after LASIK and LASEK for moderate myopia. The practical message of work like this is that drift is something to anticipate before surgery rather than a coin toss afterward.

Will I need reading glasses after LASIK anyway?

Very likely, yes, somewhere in your 40s or later. Presbyopia comes from the natural lens inside the eye losing flexibility with age, and LASIK works on the cornea, so it neither causes presbyopia nor prevents it.

The American Academy of Ophthalmology describes presbyopia as a normal part of aging that people usually start to notice after 40. A familiar pattern: someone who had LASIK at 28 needs readers at 47 and assumes the surgery failed. Their distance vision is usually where it was; the near focusing every eye loses with age is what changed. For people already in their 40s, presbyopic LASIK and LASEK exist as separate options, with their own compromises.

Later still, a cataract may form, and the National Eye Institute notes that most cataracts are related to aging. That is the lens clouding, separate from the cornea, and it's treated by replacing the lens. Keep your pre-LASIK measurements somewhere safe: lens power calculations for cataract surgery are more accurate when the surgeon knows what your cornea looked like before.

Can LASIK be redone if the numbers creep back?

Often, if enough cornea remains and the prescription has settled. The FDA describes waiting until eye measurements are consistent at two consecutive visits at least three months apart before re-treatment.

Risks and side effects to know

Re-treatment is still surgery, and it doesn't fix everything. The FDA notes that glare and halos are unlikely to improve with re-operation. The deciding number is residual corneal thickness. If there isn't enough left for a second LASIK pass, a surface treatment such as LASEK may be considered, with a slower and more uncomfortable first week (here's how long LASEK pain usually lasts), or a lens-based option instead.

Healing Eye runs a dedicated LASIK/LASEK revision center, which also sees people whose vision declined or became uncomfortable after surgery elsewhere. If that's you, gather whatever records you have from the original clinic; the original treatment numbers shape what is still possible.

What can shorten a good result, and who should wait

Most of what threatens a lasting result is settled before surgery: an unstable prescription, a thin or irregular cornea, untreated dry eye, pregnancy or breastfeeding, and health conditions that slow healing. After surgery, rubbing and blows to the eye matter most in the first weeks.

The FDA lists autoimmune diseases, diabetes and some medications that affect wound healing among the reasons LASIK may not be for you, and it states that long-term data are not available for current procedures (that page was last updated in 2018). A rare but serious problem is ectasia, a gradual weakening and bulging of the cornea; screening the topography for early keratoconus is the main way to avoid it. Dry eye is the more common nuisance and deserves its own reading: LASIK and dry eye risk.

After surgery, the FDA warns that rubbing your eye could dislodge the flap and that strenuous contact sports should wait at least four weeks. If you box, grapple or play a sport where the eye takes frequent hits, a flapless method may suit you better than flap-based LASIK, so your job and hobbies belong in the consultation.

How long any one result holds varies from eye to eye, and suitability is decided only at the in-person exam. For the safety checks themselves, see the numbers behind LASIK safety.

Who checks your eyes after you fly home?

Plan two layers: checks in Seoul before you fly, and an eye doctor at home for the years after. The FDA advises a visit within 24 to 48 hours after surgery and then at regular intervals for at least the first six months.

For Seoul, allow a few days for the detailed exam and the post-op check; the exact number of nights is something to confirm in consultation. The clinic is one minute's walk from Sinnonhyeon Station and about 70 minutes from Incheon Airport, with Friday hours running to 21:00, which can help when a flight lands late in the week. What you can do on each recovery day is covered in a separate post.

With those on file, a future question (a small drift, a first reading prescription, a cataract decades on) starts from data. If a parent or partner reads Korean, the clinic's Korean-language Clear LASIK page is easier for them to read and share.

If follow-up from abroad is the part that worries you, send a photo of your most recent prescription and the country you'll return to on WhatsApp.

Questions to ask about your own result

Whichever clinic you choose, these four questions turn “will it last” into something you can check. The broader list in four things you can actually verify covers the clinic itself.

1. How stable was my prescription across the records I brought, and over how long?
2. What corneal thickness will remain after my correction?
3. If my vision drifts, is there enough tissue left for a re-treatment, or would a different method be needed?
4. Which of my measurements should my eye doctor at home keep on file?

Write them down before your exam, then start with the first one now: photograph your old and current prescriptions side by side and send them on WhatsApp. We'll reply in English, and you'll go into the exam knowing which records to bring.