LASIK vs PRK: Differences, Recovery and Suitability

LASIK and PRK use the same type of laser to reshape the cornea, the clear window at the front of the eye, and their results are close by six to twelve months (1). What differs is how the surgeon reaches the tissue. LASIK works under a thin flap, so most people see well within a day. PRK removes the cornea's surface layer instead, which takes about a week to grow back and is sore for the first few days (2, 3).

So the choice is rarely about which laser is better. It comes down to your cornea, your work and hobbies, and how much recovery time you can spare.

LASIK vs PRK at a glance

Sources for the table: (1, 2, 3).

How each procedure works

LASIK: a flap, then the laser

In LASIK (laser-assisted in situ keratomileusis), the surgeon first makes a thin hinged flap in the cornea, usually with a femtosecond laser and sometimes with a fine blade. The flap is folded back, an excimer laser reshapes the tissue underneath, and the flap is laid back down, where it stays in place without stitches (4). Because the surface of the eye is barely disturbed, it heals quickly.

PRK and its variants: LASEK, TransPRK and epi-LASIK

In PRK (photorefractive keratectomy), there is no flap. The surgeon removes the epithelium, the thin surface layer of the cornea, and the excimer laser reshapes the tissue directly beneath it. A soft bandage contact lens protects the eye while the surface grows back (3).

PRK, LASEK and TransPRK are all surface treatments (2), and epi-LASIK belongs to the same family. They differ mainly in how the surface layer is removed: diluted alcohol loosens it in LASEK, a blunt instrument lifts it in epi-LASIK, and the laser itself removes it in TransPRK, which some clinics call "no-touch". Recovery is broadly similar for all of them. UK clinics often use the name LASEK, so if you are comparing clinics, ask which technique they mean.

Same laser, different access

In both, the excimer laser removes a precise amount of tissue to change how the cornea focuses light. Only the way in differs. The LASIK flap allows a fast, comfortable recovery but is a permanent cut through the cornea. PRK removes only the surface layer, which grows back, so more of the cornea's deeper structure stays untouched. Almost every difference below traces back to that choice.

PRK vs LASIK results: how close are they?

The best summary comes from a Cochrane review of 13 randomised trials covering 1,923 eyes (1):

• Accuracy: there was no significant difference in how many eyes ended up within half a dioptre of the target prescription at six or twelve months.
• Sharpness without glasses: LASIK had a small edge in reaching 20/20 vision (6/6 in the UK) at six months, but the evidence was rated low quality and most trials used older lasers.
• Speed: LASIK patients were far more likely to see 20/20 in the first two to four weeks.

NICE, which assesses treatments for the NHS in England, found a similar picture: in the studies it reviewed, 69% of PRK eyes, 75% of LASEK eyes and 77% of LASIK eyes ended up within half a dioptre of their target (5).

Over the long term, both hold up but can drift slightly. In a study of LASIK for short-sightedness of up to 10 dioptres, 73% of eyes were within one dioptre of the target after ten years (6). In a smaller PRK study with the same range, 55% were within one dioptre at fifteen years, with more drift in higher prescriptions (7). A matched ten-year comparison of moderate to high short-sightedness found 88% of LASIK eyes and 71% of PRK eyes within one dioptre (8). All three used older lasers, so results today may differ.

Satisfaction is high. A review of LASIK studies found 95.4% of patients satisfied (9), and the Royal College of Ophthalmologists reports that more than 95% of people are happy with laser vision correction (2).

Recovery compared

The first days after LASIK

Most people see more clearly within hours, and many return to work the next day (2). The eyes may feel gritty or watery for the first evening, but in one trial in the Cochrane review, 81% of LASIK patients had no pain the next day (1). Eye drops follow for a few weeks to prevent infection and inflammation.

PRK day by day

PRK is the harder recovery. The table shows a typical course; your own surgeon's instructions come first.

How sore is it? In a study of 157 PRK patients, average peak pain was 4.2 out of 10 with anti-inflammatory eye drops and 5.8 out of 10 with tablets (10). In one trial in the Cochrane review, 69% of PRK patients described severe pain on the first day (1). Discomfort usually fades after two to three days (3). Pain relief is part of a normal PRK plan, so ask what yours will include.

Work, screens, driving and sport

• Work: after LASIK, many people are back at work the next day (2). After PRK, plan for about a week off, and longer if your job needs sharp vision or involves dust or dirt.
• Screens: use them when they feel comfortable. Your eyes may tire and feel dry at first, so short sessions with regular breaks help.
• Driving: only once your vision meets the legal standard for driving and your surgeon has confirmed it. This usually comes sooner after LASIK.
• Sport: the Royal College of Ophthalmologists advises avoiding contact sports for at least a month after LASIK, and for a shorter time after surface treatment (2).

If you are travelling for treatment

The recovery gap matters most when surgery is abroad. After LASIK, most people have a check the next day and can usually fly home within a few days. After PRK, plan to stay until the surface has healed and the bandage lens is out, which is usually about a week. With either, arrange follow-up checks at home for the months that follow. Our page on LASIK eye surgery covers what a trip for LASIK involves.

Side effects compared

Dry eye

Dry eye is one of the most common side effects of both procedures, because both disturb the corneal nerves that help control tear production. The studies disagree on which is worse:

• In a trial that compared the two directly, dry eye symptoms rose after both, with no difference between them. Both groups were back to normal by twelve months (11).
• A study of 143 patients found chronic dry eye at one year in 5% after PRK and 0.8% after LASIK (12).
• A meta-analysis of 14 studies found that LASIK reduced tear stability and tear production, while PRK did not (13).

In the large PROWL studies, 27% to 28% of people who had no dry eye symptoms before LASIK reported new ones at three months (14). The fair reading is that both can cause temporary dryness, neither is reliably drier, and existing dry eye should be treated before either procedure.

Halos and night vision

The largest modern data come from the PROWL studies, led by the US Food and Drug Administration, which followed people after LASIK (14). At three months, 43% to 46% reported at least one new visual symptom, most often halos (30% to 40%), starbursts (29% to 32%) or glare (17% to 21%). Fewer than 1% said these symptoms made daily activities difficult, and 1% to 4% were dissatisfied. PROWL did not include PRK, and we have not found a modern PRK study of similar size.

Haze after PRK

Haze is a cloudiness that can form as the cornea heals after surface treatment. Across the Cochrane trials, visually significant haze averaged 3.3% after PRK (1). In the studies NICE reviewed, haze ranged from 0% to 31% after PRK and from 0% to 2% after LASIK (5). Surgeons often apply a drug called mitomycin C during PRK to prevent it. In one meta-analysis, it cut the risk of haze by about 70% (15), and a second analysis of 17 studies agreed (16). An American Academy of Ophthalmology review found the strongest evidence for its use in higher prescriptions (17).

Flap problems

The flap is LASIK's specific weak point. Across the Cochrane trials, 3.8% of LASIK eyes had a flap complication (1). A flap can also be moved by a hard blow to the eye years later: one case series described flaps dislodged 4 to 11 years after surgery by a basketball, a finger and a dog's paw, and vision recovered well after repair (18). PRK has no flap, so this risk does not apply.

Enhancements

Sometimes a second, smaller treatment is needed to fine-tune the result. The Royal College of Ophthalmologists says up to 1 in 10 people need further surgery (2). Rates have fallen with modern lasers: in one study of 41,504 eyes, retreatment within two years dropped from 4.52% to 0.18% between 2005 and 2012, and having PRK was one of the factors that predicted needing one (19).

Who suits each

When PRK is often the better choice

• Your corneas are on the thin side but otherwise healthy. With no flap, PRK leaves more of the cornea's deeper structure untouched (3).
• A blow to the eye is a real risk in your life. Boxing, martial arts, rugby, and military or police work are common examples (18, 20).
• You can take about a week off and accept a slower recovery.

When LASIK is often the better choice

• You need to be back at work, driving or caring for others within a day or two.
• Your corneas are of normal thickness and shape on detailed scans.
• You would rather avoid the painful first days and the small risk of haze.

When neither may suit you

The American Academy of Ophthalmology lists situations where laser vision correction is usually not advised (4):

• you are under 18, or your prescription has changed in the past year
• you are pregnant or breastfeeding (3)
• you have keratoconus, another corneal disease or corneal scarring
• you have severe dry eye
• you have advanced glaucoma, a cataract or uncontrolled diabetes
• your prescription is very high

For very high prescriptions, or corneas too thin for either laser, a surgeon may suggest a lens-based option instead, such as an implantable contact lens (ICL) or lens replacement.

Where SMILE fits

SMILE (small incision lenticule extraction) is a third laser option. A laser shapes a thin disc of tissue inside the cornea, which the surgeon removes through a small keyhole cut, so there is no flap and no surface layer to regrow. A review of 12 studies found its vision results were similar to LASIK, with fewer dry eye symptoms (21, 22). Sharp vision can take a little longer to return than after LASIK (2). Our page on SMILE eye surgery covers who it suits.

What a proper assessment checks

The assessment matters more than the brand of laser. A thorough one includes:

• Corneal tomography. This is a 3D map of the cornea's shape and thickness, with screening for keratoconus, a condition in which the cornea thins and bulges. UK professional standards require it (23).
• How much tissue will be altered. In one study, 97% of eyes that developed corneal bulging (ectasia) after LASIK had 40% or more of their corneal thickness altered by the flap and laser (24). Abnormal corneal maps are the strongest warning sign (25). These risk tools were built for LASIK and have not been tested for PRK, so PRK is a safer option for some corneas, not a risk-free one.
• A stable prescription, checked against your past records (4).
• Your tears and eyelids, since existing dry eye should be treated first.
• Your general health and medicines, including pregnancy, diabetes and autoimmune conditions (4).
• Time to decide. UK standards call for a cooling-off period of at least a week between consultation and surgery (23).

You will usually be asked to leave contact lenses out for a while before the scans, because lenses can temporarily change the shape of the cornea.

Decision guide by situation

Use this as a starting point for a conversation with your surgeon, not as a substitute for one.

Frequently asked questions

Is PRK more painful than LASIK?

Yes, for the first few days. PRK discomfort usually peaks on days 2 to 3 and fades after that (10). Most people feel little or no pain the day after LASIK (1).

Is PRK safer than LASIK?

Neither is safer overall. PRK avoids flap problems but carries a small risk of haze and a slower recovery (1). Which is safer for you depends on your cornea, prescription and lifestyle.

Why does the military prefer PRK?

Mainly because there is no flap that a blow to the eye could dislodge far from an eye surgeon. PRK made up 65% of procedures at US military eye surgery centres in 2020, though LASIK is also used (20).

Is PRK available in the UK?

Yes. The Royal College of Ophthalmologists lists PRK, LASEK and TransPRK among the laser treatments commonly used in the UK (2). Clinics there often call surface treatment LASEK.

Which is better for astigmatism?

Both can correct astigmatism (3, 4). The choice depends more on your corneal thickness and shape than on the astigmatism itself, so your scans decide which suits you.

How long will I need off work after PRK?

Usually about a week, until the surface has healed and the bandage lens is out. Jobs that need sharp vision or driving may need longer. After LASIK, many people return the next day (2).

Can I have a second treatment if my vision is not quite right?

Often, yes, if your cornea is thick enough. After LASIK, the surgeon may lift the original flap or treat the surface; after PRK, the surface is treated again. Up to 1 in 10 people need one (2).

Which lasts longer, LASIK or PRK?

Both changes are permanent, though small drifts over the years are common, especially with high prescriptions (6, 7). Neither prevents the need for reading glasses that usually starts in your 40s.

Next steps

If one option already sounds like a fit, the next step is a full assessment with corneal scans, so a surgeon can confirm whether your eyes suit LASIK, PRK, another option or none of them. Our partner ophthalmologists offer both LASIK and surface treatment, so the recommendation can follow your scans rather than what is available. Istanbul European Clinic does not provide eye treatment; every clinical decision is made by your independent partner ophthalmologist.