ICL lens implant surgery in Korea: tests, timeline and the follow-up before you fly

Published 17 September 2026 · Last updated 27 September 2026 · 10 min read · By Jae Han

For people told no to LASIK or SMILE: what the extra tests measure, whether both eyes are done on the same day, how many nights the follow-up visits need, and who is turned down for an implantable lens too.

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#What an ICL is, and why it is offered after a laser refusal

An implantable collamer lens is a thin, soft lens placed inside the eye, behind the iris and in front of your own natural lens. Laser procedures reshape the cornea and need enough healthy tissue to work with; an ICL leaves the cornea alone. The American Academy of Ophthalmology describes it as an option for moderate to high short sight and astigmatism, and for people whose corneas are too thin or irregular, or whose eyes are too dry, for LASIK or SMILE.

Being told no to LASIK does not make you an automatic yes: an ICL has its own entry tests. The lens is a medical device, and those sold in Korea need product approval from the Ministry of Food and Drug Safety (MFDS). Its medical device portal (emedi.mfds.go.kr, in Korean) and open dataset list each approved product with its name, grade, approval number, approval date, status and company. When the clinic names the lens model, you can look it up there and keep the approval number with your lens card.

#Chamber depth, cell count and lens size: the tests that decide it

You will repeat most of the laser work-up and add measurements that only matter for a lens implant:

• Anterior chamber depth, the space between the back of the cornea and your natural lens. The US labelling for the current lens requires 3.00 mm or more
• Endothelial cell count. The cells lining the inside of the cornea do not regenerate, so the US labelling sets a minimum by age: 3,875 per square millimetre at 21–25 and 2,350 at 41–45, for the shallowest permitted chamber
• The drainage angle of the eye, which must not be narrow
• Internal width of the eye, used to choose the lens size. Sizing is a prediction: the Royal College of Ophthalmologists says about 1 lens in 40 has to be swapped for another size
• Prescription stability: no more than 0.5 dioptres of change over the past year in the US labelling, two years in the UK guidance

Verify before you rely on this: Contact lenses distort these measurements. The FDA says clinics may ask you to stop wearing them from the day of the examination up to a few weeks before; get your clinic's number of days in writing. Ask, too, whether your lens is kept in stock: ICLs come in many combinations of power and size, and one that has to be ordered can turn one trip into two. Vision correction is elective and paid privately. The FDA notes that most medical insurance does not cover it, and travel insurance does not normally pay for planned surgery going wrong (see /guide/travel-vs-medical-insurance-korea). Do not plan on a tax refund either: Korea's VAT refund for foreign patients ended for services supplied after 31 December 2025 (see /guide/vat-refund-cosmetic-procedures-korea).

#Both eyes on one day, or one at a time?

Practice differs. The Royal College of Ophthalmologists says some centres operate on both eyes the same day, but that more commonly the second eye is delayed by a day or longer, so the surgeon can see that the first eye is recovering well and the lens size was right. Cleveland Clinic, by contrast, describes both eyes being treated in one session. For a traveller the difference is a day or two, so it should not drive the choice. Ask the surgeon which they do, and why.

Older lens models needed a small laser hole made in the iris a week or two beforehand. The current model has a central port instead, and the FDA labelling says this removes the need for the laser step. If a clinic schedules one, ask which lens they are implanting.

#Testing, surgery, the next-morning check and the review that sets the flight

1. Weeks beforeContact lenses out for the period your clinic specifies. Send your prescription history and any report from a previous laser assessment.
2. Day 1Testing, most of a day, with dilated pupils. You learn whether you qualify, which lens and size are planned, and whether it is in stock.
3. Day 2–3Surgery, about 20 to 30 minutes per eye under anaesthetic drops, sometimes with light sedation. Back to the hotel the same day with a shield on; you cannot drive and should not travel back alone.
4. The next morningThe check the FDA says you should have the day after surgery: eye pressure and the position of the lens. If eyes are done separately, the second eye usually follows this check.
5. The second reviewThe FDA describes early visits as a few days to a few weeks apart. The clinic's second review is the appointment that sets your flight; keep a spare day after it in case the surgeon wants to look again or adjust a toric lens.
6. Back homeDrops for the weeks prescribed, and a check with a local eye doctor when the clinic asks for one; Cleveland Clinic's schedule has it at three months. After that, an eye examination every year.

That adds up to 7–10 nights, and the count comes from the visits above: a testing day, surgery, the next-day check the FDA calls for, the second eye if it is done separately, and the clinic's second review with a spare day after it. Seven works when both eyes are done on day 2 and the clinic sets the review for day 6 or 7. Use nine or ten if your eyes are done on separate days, if the review is later in the FDA's range, or if the flight home is long.

Practical note: Book the first-day testing for a Monday or Tuesday, so that surgery, the next-morning check and the second review all fall on working days. Check the calendar for Lunar New Year and Chuseok, when clinics close for several days.

Verify before you rely on this: ICL surgery is done under anaesthetic drops, awake, and sometimes with light sedation. Under drops alone Korea's operating-room CCTV rule does not apply; with sedation it does. As of 27 September 2026, the Ministry of Health and Welfare states that since 25 September 2023 operating rooms used for surgery under general anaesthesia or sedation must have CCTV and the patient can ask for the operation to be filmed. The full rule and how to request it are at /treatment/plastic/how-to-spot-a-red-flag-clinic.

#Rubbing, lifting and saunas: the first month

The FDA puts healing at about eight weeks, so the trip covers the start of recovery, not the end of it. The bathhouse belongs before the surgery, and the week's sightseeing should be the kind done in sunglasses on foot, not the kind done with a rucksack.

#Turned down for a lens implant too

• Under 21 on the US labelling, which covers ages 21 to 45; the UK college says over 18. Ask your clinic what limits it works to
• Pregnant or breastfeeding: a listed contraindication, and hormones shift the prescription
• An anterior chamber that is too shallow, a narrow drainage angle, or a cell count below the minimum for your age
• Glaucoma, an existing cataract, or a history of inflammation inside the eye (uveitis)
• A prescription still changing, or outside the lens range: the US labelling runs from -3 to -20 dioptres of short sight, with up to 4 of astigmatism in the toric version
• Only one eye with good vision, or sports with regular blows to the face such as boxing, both on the FDA's list of reasons to think again
• Over about 50, when the UK college says replacing the natural lens is often the better operation (the cataract surgery article covers that route)

#What an ICL package covers, and the lens exchange it may not

ICL fees are set by each clinic with no official list behind them, so this page gives no figure; how to compare two package quotes line by line is at /guide/how-to-read-a-korean-clinic-quote. The AAO's only comparison is that an ICL costs roughly twice as much as LASIK. The line to look at hardest is the lens exchange: the UK college's figure of about one lens in forty needing a different size means it is not a remote possibility, and a package that leaves it out is a package with a gap.

#Nine questions, starting with your own numbers

• What are my anterior chamber depth and endothelial cell count, and what are your minimums?
• Which lens model and size will you implant, and is it in stock?
• Both eyes on the same day or separately, and what is your reason?
• If the lens turns out to be the wrong size or needs rotating, who pays, and how many extra days would I need?
• Who operates, and is an anaesthetist present if I am sedated?
• If I am sedated, can I ask for the operation to be filmed on the operating-room CCTV?
• What pressure reading are you looking for at the next-morning check, and what happens if it is high?
• Will you give me my measurements, the lens card and the surgical record in English?
• Which checks do you want from my eye doctor at home, and at what intervals?

A sudden rise in eye pressure is the early complication surgeons watch for, which is why the next-morning check is not optional. The UK college tells patients to report increasing aching pain, redness, light sensitivity or blur without delay. Very short-sighted eyes also carry a higher risk of retinal detachment with or without surgery, so flashes, new floaters or a shadow across the vision are a same-day matter.

#Common questions

Do I need a laser hole in the iris before ICL surgery?

With the current lens, usually not. Older models needed a small laser opening in the iris a week or two before surgery; the current model has a central port instead, and the FDA labelling says this removes the need for that step. A clinic that schedules the laser step should be asked which lens it is implanting, because an older model changes both the timeline and the answer.

Will I need a second operation to swap the lens?

Sometimes. The lens size is chosen from a measurement of the inside of the eye, and the Royal College of Ophthalmologists says about one lens in forty has to be exchanged for another size. That is why the next-morning check looks at the lens position, why the second review matters, and why the quote should say who pays for an exchange and how many extra days it would take.

Is an ICL really reversible?

The lens can be removed, and the AAO calls it the only fully reversible refractive procedure. The UK college's caveat: not every problem an implant causes is undone by taking it out.

What are the risks?

Longer term: an earlier cataract, raised eye pressure, and gradual loss of the cells lining the cornea. The AAO puts cataract at around 2 per cent over 5 to 14 years, mostly in people over 40, and says the newer lens design has reduced it. The FDA also lists glare and halos, under- or over-correction, infection, retinal detachment and, rarely, loss of vision. Night-time glare is common early on and, according to the UK college, usually improves within a few months.

Who looks after my eyes once I am home?

A local ophthalmologist or optometrist. The UK college considers a standard eye health check once a year sufficient after an ICL; the FDA says follow-up is for life and that endothelial cell counts have to be repeated at intervals. Arrange it before you travel, and keep the lens card.

Work out the whole trip: open the total cost calculator with 9 nights filled in. That is a planning default, not a schedule — replace it with the dates your own clinic gives you.

Planning the trip? Tick off the trip checklist — what to get in writing, what to pack and which documents to collect before you fly home — and keep the Korean phrase cards on your phone for taxis and pharmacies.

This site is an information resource, not a medical provider, agency or broker. We do not arrange treatment, refer patients to specific hospitals, or receive commission from clinics for introductions. Nothing here is medical advice — decisions about treatment belong to you and a licensed doctor.

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