After 40, how long does lasik last? The cornea holds while the lens keeps aging

If you're asking how long does lasik last, the honest answer starts with what the laser does and what it doesn't: it reshapes the cornea, but it doesn't stop the eye from changing as you age. What changes after 40 is the lens inside the eye, which is why presbyopia and, eventually, cataracts belong in the answer too. For a reader over 40 flying to Seoul, the bigger worry is usually what happens five or ten years from now, when the surgeon is a long flight away.

That is why I tell patients that how long does lasik last is only half the question; the other half is who looks after your eyes when they change. At EYEONCE that is our lifetime aftercare: if your vision changes later, contact us on WhatsApp first (+82-10-6308-0984) and we will review a detailed re-examination and, where appropriate, arrange the re-treatment. Your diagnosis, surgery and follow-up are doctor-led from start to finish.

The first step is small. Send a photo of your current glasses prescription or your last eye exam on WhatsApp, along with your age and the dates you're considering. Our in-house interpreters work in English, Chinese, Mongolian and Thai, so there is no language barrier.

A little, gradually, and more in some corneas than others.

The same study points at a measurement worth understanding. In LASIK eyes, more regression went with a thinner residual stromal bed, the corneal tissue left under the flap once the laser has done its work. In LASEK eyes, it went with a thinner cornea before surgery. The authors also suggested that early regression in the first months may hint at the long-term result.

That is how the planning works in practice. Corneal thickness, the planned flap and the depth of tissue the laser will remove add up to the residual bed.

With LASIK, most people see better within hours and return to light activity the next day. LASEK heals more slowly: mild discomfort and light sensitivity in the first days, gradual improvement through week one, and full stabilization typically by month one to three, with a protective bandage contact lens early on.

The FDA's patient page on what to expect after LASIK describes burning, itching or the feeling that something is in the eye right after surgery. Those sensations are part of why the first evening is best spent in the hotel with the shield on, not out walking Gangnam.

The lens break starts before the trip. Soft contact lenses need to come out at least 5 to 7 days before your exam, and hard or RGP lenses for longer, because lenses reshape the cornea and skew the measurements. If you read with contacts at the office, plan those glasses-only days into your work calendar now.

Common early effects are dry eye, glare and halos at night, and blur that comes and goes while the surface heals. Less common are under- or over-correction and the gradual regression described above. Rare but serious is corneal ectasia, a progressive weakening of the cornea, which is the main reason thickness screening comes before anything else.

The FDA lists situations where LASIK may not be advisable, including a prescription that has changed recently, pregnancy or nursing, some diseases and medications that affect healing, and corneas that are thin. Large pupils in dim light and existing dry eye also call for caution. Screening at EYEONCE runs on Topcon diagnostics, and treatment is performed with the Ziemer FEMTO Z8 and WaveLight EX500. Whether you're a candidate is decided at the in-person exam, and a recommendation for LASEK, ICL or no surgery at all is a legitimate outcome. The LASEK guide explains who that route tends to suit.

As a co-author of the Textbook of Dry Eye (2019), the side effect I weigh most carefully in someone over 40 is dryness. Tear film often thins with age and with long screen days, and laser surgery can make that worse for a while.