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At a glance
- LASIK is a laser procedure that reshapes the cornea to correct short-sightedness, long-sightedness and astigmatism, reducing dependence on glasses and contact lenses.
- It is a quick, day procedure with rapid visual recovery for most people.
- Related options include ReLEx SMILE and surface treatments such as PRK/TransPRK.
- Suitability depends on a stable prescription, corneal thickness and overall eye health.
What LASIK is
LASIK (laser-assisted in situ keratomileusis) is a form of laser eye surgery that reshapes the cornea — the clear, dome-shaped window at the front of the eye — so that light is focused sharply on the retina. By adjusting the curvature of the cornea, it corrects short-sightedness (myopia), long-sightedness (hyperopia) and astigmatism, allowing many people to go about daily life with far less reliance on glasses or contact lenses. Laser vision correction is especially relevant in Singapore, where short-sightedness is very common and often begins in childhood. For adults who find glasses inconvenient or who cannot tolerate contact lenses, it offers a way to reduce that dependence — though, as with any surgery, it suits some eyes and lifestyles better than others.
How LASIK works
In broad terms, the surgeon first creates a thin, hinged flap in the surface of the cornea. This flap is gently lifted to one side, and a precise laser is then used to reshape the corneal tissue underneath, removing microscopic amounts to flatten or steepen the curve as the eye requires. The flap is repositioned and settles back into place, healing naturally without the need for stitches. The laser step itself is brief, and the eye is kept numb and comfortable throughout.
LASIK is not the only way to reshape the cornea, and not automatically the best choice for every eye. Related techniques exist, and a refractive surgeon advises which is most appropriate after examining the eyes. Surface treatments such as PRK or TransPRK reshape the outermost layer of the cornea without creating a flap. Newer flap-free “lenticule” techniques remove a small, precisely shaped disc of tissue through a very small opening rather than lifting a flap at all. Each approach has its own recovery pattern and advantages depending on the shape and thickness of the cornea, the prescription being corrected and the person’s lifestyle.
Types of laser vision correction
LASIK uses a corneal flap and typically offers rapid visual recovery. ReLEx SMILE is a flapless, keyhole technique that removes a small lens-shaped piece of tissue through a tiny incision. PRK / TransPRK are surface treatments performed without a flap and can be useful when the cornea is thinner, at the cost of a somewhat longer initial recovery. There is no single “best” procedure — the right method is the one that matches your eyes, and your surgeon recommends it after a full assessment rather than the other way round.
Who it may suit and who is not suitable
LASIK generally suits healthy adults whose spectacle prescription has been stable for a sustained period and who have suitable, healthy corneas of adequate thickness. People whose vision meets these conditions and who understand the aims and limits of the surgery tend to be the most straightforward candidates.
It is not suitable for everyone. Laser vision correction is usually avoided during pregnancy and breastfeeding, when the prescription may shift. It may be unsuitable for eyes affected by significant dry eye, thin corneas, keratoconus (a condition in which the cornea becomes progressively thinner and cone-shaped) or certain other eye diseases, and it is not appropriate while the prescription is still changing, as can happen in younger people. Some general health conditions that affect healing may also count against it. A thorough assessment decides suitability in each case, and it is entirely normal to be told that surgery is not advisable — being turned down is a sign that the screening is doing its job, not a setback.
The pre-operative assessment
A detailed eye examination is the foundation of safe laser vision correction, and it matters more than the choice of laser itself. During the assessment, the eye specialist confirms and re-checks your prescription, measures the thickness and maps the shape of the cornea, tests your tear film for dry eye, and examines the overall health of the front and back of the eye. These measurements determine whether surgery is safe, which technique suits your eyes, and what result is realistic. If you wear contact lenses, you will usually be asked to leave them out for a period beforehand so the cornea returns to its natural shape and the readings are accurate. It is worth treating this appointment as the most important part of the whole process.
What to expect during and after
The procedure is done while you are awake, using anaesthetic eye drops so the eye is numb; most people feel pressure rather than pain. Both eyes are usually treated on the same day, and the laser part takes only a short time per eye. A device holds the eyelids gently open, and you will be asked to look at a target light while the laser does its work. Afterwards the eyes may water, sting mildly or feel gritty for a short while.
Vision is typically blurry at first and then often improves noticeably within a short time, sometimes over the following hours to days, though it can continue to sharpen gradually. You will be given lubricating and other drops to use as directed, and follow-up checks are arranged to confirm that the eyes are healing as expected. Many people are able to return to ordinary activities quite quickly, but it is sensible to arrange for someone to accompany you home after the procedure.
Recovery and aftercare
Careful aftercare protects the result. In the healing period it is important to avoid rubbing the eyes, which can disturb a flap while it settles. Your surgeon may recommend wearing protective shields, particularly overnight at first, and using dark glasses outdoors for comfort. Lubricating drops are used to keep the surface comfortable and to support healing. You will usually be advised to avoid water in the eyes, swimming, spa pools and dusty or dirty environments for a period, and to keep away from eye make-up until the eye has recovered. Attending the scheduled follow-up checks allows the eye specialist to confirm the eyes are healing well and to pick up any concern early.
Risks and side effects
Most side effects are temporary. Dry eyes and glare or haloes around lights at night are common in the early weeks and usually settle as the corneal nerves and surface recover; Singapore’s air-conditioned indoor environment can make dryness feel more noticeable for a time. Less commonly, the eye may be under-corrected or over-corrected, and an additional “enhancement” procedure is occasionally needed to fine-tune the result. Rarer problems include difficulties with the flap, infection, and persistent dry eye or lasting night-vision disturbance. Your surgeon will explain the individual risks that apply to your eyes and prescription, and weighing these openly is part of deciding whether to go ahead.
Realistic expectations
Laser vision correction reduces dependence on glasses and contact lenses, but it does not stop the eyes from ageing. In particular, it does not prevent presbyopia — the natural, age-related loss of near focus — so reading glasses may still be needed later in life even after successful surgery. Nor does it remove the long-term eye health risks associated with high short-sightedness, such as a greater chance of certain retinal problems; those risks relate to the length and structure of the eye rather than to the glasses prescription the laser corrects. Understanding what the surgery can and cannot do helps set expectations that the result can actually meet.
Choosing safely in Singapore
The safest decisions are led by a proper assessment, not by advertising. Choose an experienced eye surgeon or refractive surgeon and insist on a thorough screening before committing, and be cautious about marketing-led offers that emphasise price or speed over careful evaluation. In Singapore, laser vision correction is offered at specialist eye centres including public institutions such as the Singapore National Eye Centre (SNEC) as well as private clinics, and HealthHub carries general patient information on eye health. A good clinic explains why a particular technique suits your eyes, is candid about the risks, and is willing to tell you if you are not a suitable candidate.
LASIK cost and suitability in Singapore
Laser vision correction is an elective procedure, so it is generally not covered by MediSave or subsidies, and fees vary with the technology used (standard LASIK, bladeless/femtosecond LASIK, ReLEx SMILE or surface PRK), the clinic and the surgeon. Most centres quote a package that includes the pre-operative assessment and a period of follow-up — it is worth confirming exactly what is included and the cost of any enhancement (“top-up”) if needed later. The single most important step remains the thorough screening, which confirms you are a safe candidate and which technique suits you.
Managing dry eyes and night vision afterwards
Temporary dryness is the most common side effect, and Singapore’s air-conditioned environment can make it more noticeable. Using preservative-free lubricating drops as advised, staying well hydrated and taking regular breaks from screens all help while the corneal nerves recover. Glare or haloes at night are common early on and usually settle. Following the aftercare instructions protects the result and lowers the small risk of complications.
When to seek help after surgery
Most recoveries are smooth, but some symptoms need prompt attention. After surgery, seek urgent eye care if you experience increasing eye pain, worsening or sudden loss of vision, or marked redness or discharge, as these may point to an infection or a problem with the flap that should be assessed quickly. If you are still considering laser vision correction, book an assessment with an eye specialist to confirm suitability and discuss the most appropriate technique for your eyes and lifestyle.
Common questions
Is LASIK permanent?
The corneal reshaping is permanent, but natural age-related changes such as presbyopia and cataract can still affect vision later in life.
Does LASIK hurt?
Numbing drops mean the procedure is generally painless; some pressure is felt, and mild irritation is common for a short period afterwards.
What if I am not suitable for LASIK?
Alternatives such as PRK, ReLEx SMILE or an implantable contact lens may be options; your surgeon will advise.
Related conditions & guides
- Myopia (short-sightedness)
- Astigmatism
- Implantable contact lens (ICL)
- Best eye specialists in Singapore
Sources
- Singapore National Eye Centre — refractive surgery.
- American Academy of Ophthalmology — LASIK.
- Health Sciences Authority Singapore — medical device information.
This article is for general information only and does not replace a consultation with a qualified eye-care professional. Please seek personalised advice for your own eyes.