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Comparisons

LASIK vs PRK: compared, side by side

A flap against a surface treatment. The clinical difference is tissue and recovery rather than result, which is why PRK is still used where the cornea is thin.

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Quick answer

LASIK cuts a flap in the surface of the cornea and reshapes the tissue beneath it. PRK removes that surface layer altogether and reshapes the tissue beneath, leaving it to grow back over a few days. The correction is similar; the first week is not, and PRK remains the option where the cornea is too thin for a flap.

General educational information about a subject, not an assessment of your own eyes. Suitability and treatment decisions are made by a qualified ophthalmologist who has examined you.

Compared
LASIK and PRK
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Comparison
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These are the oldest two answers to the same problem, and the difference between them is where the outer layer of the cornea ends up: folded back and replaced, or removed and regrown.

LASIK and PRK compared category by category
Category LASIK PRK
What happens to the surface A flap is cut, folded back, and repositioned at the end The surface layer is removed and grows back over several days
Laser used Two devices: one for the flap, one for the correction One excimer laser
The first week Vision is often serviceable within a day or two Vision is blurry until the surface layer has regrown, and this is the main practical cost of the procedure
Discomfort Typically mild and short-lived Typically more noticeable in the first days, which is expected rather than a complication
Corneal tissue The flap itself consumes depth, so more total tissue is needed No flap is created, so it remains an option where the cornea is too thin for one
Flap-related risks Flap displacement and epithelial ingrowth are recognised, uncommon risks No flap, so these do not apply
Haze Not a typical feature A recognised possibility while the surface heals, which is why the post-operative drops matter
When LASIK may be considered

Your cornea has enough thickness to spare and you want the recovery that comes with a flap, or your prescription is one that is well established for a flap-based technique.

When PRK may be considered

Your cornea is thinner, its surface is irregular, you have had a previous surface treatment, or you would rather avoid a flap on principle and can accept a slower first week.

Neither column is a recommendation. Which procedure suits you depends on measurements that can only be taken in a clinic, and a surgeon who tells you one option is right for everyone is describing their product, not your eyes.

LASIK vs PRK

LASIK and PRK are the two oldest answers to the same question, and the difference between them is entirely about the outer layer of the cornea. One folds that layer back, reshapes underneath, and puts it back. The other removes it, reshapes underneath, and waits for it to regrow.

Because the reshaped tissue is the same tissue either way, the intended optical result is broadly comparable for a given prescription. What differs is how much corneal depth the procedure consumes, how the eye feels and sees in the first week, and which corneas each technique can safely be used on.

Why anyone still chooses a slower procedure

A flap is a structural feature that has to be cut, and cutting it consumes tissue. In an eye whose cornea is thinner than average, or whose surface is irregular, the arithmetic of a flap may leave too little behind to be comfortable, while a surface treatment on the same eye fits within it. PRK is also the conventional choice after certain previous surgeries, and for patients whose occupation makes any risk of flap displacement unwelcome.

There is a second, quieter reason: surface ablation avoids the interface between a flap and the tissue beneath it. That interface is stable in the overwhelming majority of eyes, and it is a feature that PRK simply does not have.

The first week, which is the real trade

After LASIK, most people have serviceable vision within a day or two and are back to normal routines quickly, with instructions about not rubbing the eye. After PRK, vision stays blurred until the surface layer has regrown, which takes days rather than hours, and the eye is typically more uncomfortable during that period. The discomfort is expected rather than a sign of a complication, and it is managed with the drops and lubricants the clinic supplies.

That week is the price of the procedure, and it is worth being honest about it when choosing. A patient who cannot take a week of blurry vision, for work or for care responsibilities, should weigh that heavily rather than being persuaded by a claim that the recovery is "just as quick".

Haze, and why the drops matter

Because the surface layer has to regrow, PRK carries a recognised possibility of haze, a faint cloudiness in the regenerating tissue. It is more likely with higher prescriptions and with sun exposure during healing, which is why the post-operative steroid drops and the instruction to wear sunglasses are not optional extras.

Haze is a possibility rather than an expectation, it is usually mild, and it typically settles. The point of naming it is that the follow-up schedule exists for a reason: the visits are how a clinician notices something early enough to adjust treatment.

Long term, and later treatments

Both procedures change how corneal thickness and eye pressure read for the rest of your life, which matters if you are later assessed for glaucoma or need a lens implant calculated. Ask for a copy of your preoperative measurements and your operative record; it is the single most useful document you will own afterwards, whichever technique you choose.

If a residual prescription remains or short sightedness returns, LASIK can often be refined by lifting the existing flap, while a repeat surface treatment follows the same course as the first one. Both are decisions to make with a clinician who can see the measurements, not from a table.

Also known as lasik vs prk, prk vs lasik, lasik compared with prk

Questions about LASIK vs PRK

Each answer below is the short version; the question links to the page that carries it in full, with sources.

  • What is the difference between PRK and LASIK?

    PRK removes the cornea’s outer layer and lets it regrow, while LASIK lifts a flap and replaces it. PRK involves no flap but a slower, more uncomfortable first few days.

  • Why is PRK recovery longer?

    PRK recovery is longer because the outer layer of the cornea has to regrow, and vision stays soft while it does. Flap and lenticule procedures leave that layer intact, so the surface settles sooner.

  • Can PRK be used for thin corneas?

    PRK is one of the options considered when the cornea is thin, because creating a flap and the tissue it requires is avoided. Whether it is appropriate still depends on the predicted remaining thickness for your correction.

All 112 LASIK questions, searchable

Where this is covered in full

Educational information only

This page describes what is generally true about lasik vs prk. It is not a diagnosis, and it cannot say whether a treatment is suitable for you, because suitability depends on measurements taken during an examination.

Read the full medical disclaimer

Sources & further reading

We prefer primary sources. Where a claim comes from a manufacturer, a single study or a regulator, it is labelled as such below.

  • Laser In Situ Keratomileusis (LASIK) Clinical reference StatPearls, NCBI Bookshelf

    The equivalent clinical reference chapter for LASIK, used so that comparisons describe both procedures symmetrically.

    Used for How LASIK creates and manages a corneal flap; LASIK complication categories.

    Link checked 22 September 2026

  • Comparison of clinical outcomes of LASIK, Trans-PRK, and SMILE Peer-reviewed literature Peer-reviewed literature (via PubMed Central)

    A comparative study of three commonly used refractive procedures, including a summary of proposed advantages of each.

    Used for The procedure comparison page, particularly the PRK discussion.

    Link checked 22 September 2026

These pages go deeper on the questions that usually follow this one.

How LASIK works The flap, the two lasers, and what the surface of the eye does afterwards. SMILE Pro compared with LASIK and PRK The differences between the main refractive procedures, without declaring a winner.