You must be at least 18 years old to get LASIK, as no laser systems are approved for use on anyone younger. In practice, though, most surgeons recommend waiting until your mid-20s, when your prescription is more likely to have settled. Age alone doesn’t determine eligibility. Your eyes need to have stopped changing, and several other factors come into play depending on where you are in life.
Why 18 Is the Legal Minimum but Not the Ideal
The FDA sets 18 as the hard floor for LASIK. But being old enough legally doesn’t mean your eyes are ready. The eye continues to grow and change shape through adolescence and into early adulthood, which directly affects your prescription. In a large study tracking young people with myopia (nearsightedness), about 77% had stable prescriptions by age 18, but that still leaves nearly one in four whose vision kept shifting. By age 21, 90% had stabilized.
This is why surgeons require your prescription to be unchanged for at least two consecutive years before they’ll operate. If your eyes are still shifting, LASIK could correct your vision perfectly today and leave you needing glasses again a year later. The FDA specifically flags patients in their early 20s or younger as more likely to have unstable prescriptions and recommends they discuss additional risks with their surgeon.
For most people, the practical sweet spot is somewhere between 25 and 40. Your prescription is stable, your eyes are healthy, and you’re unlikely to need reading glasses for several more years.
The Stability Requirement Matters More Than Age
Two years of a stable prescription is the standard benchmark, though some situations call for stricter rules. The U.S. military, for example, requires one year of stable vision for service members over 20, but two full years of stability for those aged 18 to 20.
Stability isn’t just about aging out of adolescence. Hormonal changes during pregnancy and breastfeeding can temporarily shift your corneal shape and prescription. If you’ve recently had a baby, surgeons recommend waiting until you’ve completely stopped breastfeeding, your menstrual cycle has returned to normal, and your prescription has returned to its pre-pregnancy baseline. Simply resuming your period while still nursing isn’t enough on its own to confirm things have settled.
What Changes After 40
There is no upper age limit for LASIK. People in their 60s, 70s, and even 80s can be candidates if their eyes are otherwise healthy and their prescription is stable. But turning 40 introduces a new wrinkle: presbyopia, the gradual loss of close-up focusing ability that eventually affects everyone.
LASIK corrects the shape of your cornea, which fixes distance vision. It doesn’t restore the flexibility of the lens inside your eye, which is what you lose with presbyopia. So a 45-year-old who gets standard LASIK for nearsightedness may end up with excellent distance vision but still need reading glasses for menus, phones, and computer screens.
To work around this, many surgeons offer a modified approach sometimes called mini-monovision. Instead of correcting both eyes for perfect distance, they intentionally leave one eye (usually the non-dominant one) slightly undercorrected. For someone in their 40s, this mild undercorrection is subtle enough that you barely notice a difference with both eyes open, but it gives you functional vision at arm’s length for things like dashboards and watches. For patients in their 50s, the undercorrection is a bit stronger to keep up with increasing presbyopia. You may still reach for reading glasses for fine print, but everyday tasks become much easier.
Surgeons often test this approach before committing to surgery. You’ll wear a contact lens that simulates the effect and spend a few days going about your normal routine to see if the trade-off feels comfortable.
Why Surgeons Sometimes Recommend a Different Procedure After 50
LASIK reshapes the cornea, but the cornea isn’t always the right thing to fix in an older patient. After 50, the natural lens inside the eye starts to cloud and stiffen. Even if you don’t have a full-blown cataract yet, early lens changes can scatter light in ways that reduce visual quality. A surgeon can detect these subclinical changes with specialized imaging, even when your vision still seems fine on a standard eye chart.
If your lens is already degrading, LASIK has two drawbacks. First, the visual improvement may be short-lived because the cataract will continue to develop and change your vision regardless of what was done to your cornea. The American Academy of Ophthalmology advises against LASIK when cataracts are affecting vision, and notes that any amount of cataract means LASIK results could fade as the cataract grows. Second, having had LASIK makes the calculations for a future lens implant during cataract surgery more complex, and can limit which advanced implant designs work well for you.
For these reasons, many surgeons steer patients over 50 toward refractive lens exchange instead. This procedure replaces your natural lens with an artificial one, correcting your prescription and eliminating the possibility of cataracts entirely, since there’s no natural lens left to cloud. It’s the same operation as cataract surgery, just done before the cataract fully develops. Patients who are farsighted benefit especially, since corneal procedures tend to be less stable for farsightedness correction over time. Interestingly, LASIK is sometimes used after lens replacement surgery to fine-tune the result if the prescription isn’t quite perfect.
Other Factors That Can Disqualify You at Any Age
Age gets you in the door, but your eyes still need to pass several screening criteria. Conditions that can rule out LASIK regardless of how old you are include:
- Corneas that are too thin or irregularly shaped. LASIK removes a thin layer of corneal tissue, so you need enough thickness to work with safely.
- Severe dry eye. LASIK temporarily worsens dry eye, and starting with significant dryness increases the risk of prolonged discomfort and healing problems.
- Glaucoma or macular degeneration. These conditions affect parts of the eye that LASIK doesn’t touch, and the procedure won’t help them.
- Very large pupils. Pupils that dilate beyond the treatment zone can cause glare and halos at night.
- Extremely high prescriptions. There are limits to how much corneal reshaping is safe. Prescriptions beyond a certain range may require a lens-based procedure instead.
A comprehensive screening exam, which includes corneal thickness measurements, pupil size evaluation, tear film assessment, and a detailed look at the lens inside your eye, determines whether you’re a good candidate. The exam takes about an hour or two and is more thorough than a standard eye checkup.