When most people think of laser eye surgery, LASIK is the name that comes to mind. But there’s another highly effective, time-tested procedure that sometimes suits patients even better: PRK. In fact, PRK came first — it’s the original laser vision correction procedure, and it remains an excellent choice today, particularly for people who aren’t ideal candidates for LASIK.
If you’ve been told you have thin corneas, you lead a very active lifestyle, or you simply want to understand all your options before committing, PRK deserves a proper look. This guide explains exactly what PRK is, how the procedure works step by step, what it can correct, and who tends to benefit most.
What PRK actually is
PRK stands for Photorefractive Keratectomy. Like LASIK, it’s a laser procedure that corrects vision by reshaping the cornea — the clear, dome-shaped front surface of the eye — so that light focuses correctly on the retina. The correction principle is essentially identical to LASIK; the difference lies in how the surgeon accesses the corneal tissue to reshape it.
PRK is a surface procedure, sometimes called surface ablation. Rather than creating a flap in the cornea (as LASIK does), PRK works directly on the surface after temporarily removing the cornea’s thin outer layer. That single distinction shapes everything about who PRK suits and how recovery unfolds.
PRK is also the foundation for related surface techniques, including Custom PRK and TransPRK (TSA) — a touch-free, single-step version — which we’ll touch on below.
A quick history: the original laser vision correction
It’s worth knowing that PRK isn’t a lesser or “budget” alternative to LASIK — it’s the procedure that started it all. PRK was the first widely performed laser vision correction, and LASIK evolved from it. Decades of use and refinement stand behind PRK, and it continues to deliver outcomes comparable to LASIK for well-selected patients. Its long track record is one reason surgeons remain completely comfortable recommending it. The U.S. FDA regulates the excimer lasers used and maintains patient-facing information through its LASIK and refractive surgery program.
How the PRK procedure works, step by step
PRK is quick — typically just a few minutes per eye — and, like LASIK, is performed while you’re awake with numbing drops. Here’s what happens.
1. Numbing the eye
Anaesthetic drops make the surface of your eye insensitive to pain. There are no needles and no general anaesthetic.
2. Removing the epithelium
The cornea’s outermost layer — a thin protective layer called the epithelium — is gently removed to expose the tissue beneath. This is the defining step that distinguishes PRK from LASIK: instead of creating and lifting a flap, the surgeon works on the surface directly. The epithelium naturally regenerates over the following days.
3. Reshaping the cornea
An excimer laser removes microscopic amounts of corneal tissue in a pattern calculated specifically for your prescription — exactly as in LASIK. This is the step that actually corrects your vision.
4. Placing a bandage contact lens
Because the epithelium has been removed, the surgeon places a soft bandage contact lens over the eye to protect it and keep you comfortable while the surface heals. This lens stays in for several days until the epithelium has regrown, then is removed at a follow-up visit.
What PRK can correct
PRK corrects the same range of refractive errors as LASIK:
- Nearsightedness (myopia) — difficulty seeing distant objects clearly.
- Farsightedness (hyperopia) — difficulty with near vision.
- Astigmatism — blurred or distorted vision at all distances caused by an uneven corneal shape.
For most patients within the treatable range, PRK delivers excellent, lasting results — comparable to what LASIK achieves.
PRK vs. LASIK: the key difference in brief
The heart of the comparison is simple: LASIK creates a corneal flap; PRK works on the surface without one. This gives LASIK a faster initial recovery, but gives PRK certain advantages — notably preserving more corneal tissue and avoiding any flap-related considerations. Neither is universally “better”; they suit different eyes. We compare them in full in LASIK vs. PRK: Understanding the Key Differences.
Who is PRK a good fit for?
PRK is often the procedure of choice for patients who aren’t ideal LASIK candidates, including those who:
- Have thinner corneas, where creating a flap would leave too little tissue — see Why PRK May Be the Better Choice for Thin Corneas.
- Lead very active lifestyles or play contact sports, where not having a flap can be an advantage.
- Work in professions where a corneal flap is a concern.
- Have certain corneal surface characteristics that make a surface procedure preferable.
Determining whether PRK, LASIK, or another procedure suits you requires a full assessment. Our guide Am I a Good Candidate for LASIK? covers the general criteria, and much of the same evaluation applies to PRK.
What recovery looks like
Here’s the honest trade-off with PRK: because the surface layer must regrow, the initial recovery is more gradual than LASIK’s. In the first several days, vision is hazy and the eyes can feel uncomfortable while the epithelium heals under the bandage lens. Vision then sharpens over the following weeks, reaching its full, stable result over one to three months for many patients. The final outcome is excellent — it simply asks for more patience early on. We break this down day by day in PRK Recovery: A Week-by-Week Guide.
Benefits and considerations at a glance
Benefits: preserves more corneal tissue, no flap and therefore no flap-related considerations, well suited to thin corneas and active lifestyles, decades-long track record, and results comparable to LASIK.
Considerations: slower initial visual recovery, more discomfort in the first few days, and a longer timeline to final vision than LASIK.
Common concerns about PRK — addressed
Because PRK is less talked about than LASIK, patients often arrive with a few worries. Here are the most common, addressed honestly.
“Isn’t PRK the ‘old’ procedure?” PRK came first, but “older” doesn’t mean outdated. It has been continuously refined for decades and remains a first-choice procedure for many patients, with modern variations like Custom PRK and TransPRK representing the latest surface technology. Surgeons recommend it because it works — not because LASIK is unavailable.
“Is the longer recovery a dealbreaker?” For some people it isn’t practical to take several days of downtime, and that’s a legitimate consideration. But many patients find that planning a long weekend or a few days off is a small price for a procedure that may be safer for their particular eyes. The recovery is more gradual, not endless, and the final result is excellent.
“Will it hurt more than LASIK?” The first few days involve more discomfort than LASIK — expect grittiness, watering, and light sensitivity while the surface heals. A bandage contact lens and prescribed drops manage this, and the discomfort eases significantly once the epithelium regrows. Most patients describe it as very manageable with the right preparation.
“Are the results really as good?” Yes. For well-selected patients, PRK’s final visual outcomes are comparable to LASIK. The difference is the journey, not the destination. In fact, many patients who were initially disappointed not to qualify for LASIK end up delighted with their PRK results — proof that the right procedure matters more than the most famous one.
Understanding these points upfront tends to dissolve most of the hesitation patients feel about PRK. And because everyone’s eyes are different, the most reliable way to weigh these considerations for yourself is a personalized consultation.
Frequently asked questions
Is PRK as effective as LASIK? For well-selected patients, PRK achieves final results comparable to LASIK. The main difference is a more gradual initial recovery, not the end outcome.
Does PRK hurt? Numbing drops prevent pain during the procedure. The first few days of healing can involve more discomfort than LASIK, managed with a bandage contact lens and prescribed drops.
Why would I choose PRK over LASIK? PRK is often recommended for thinner corneas, active lifestyles or contact sports, and certain corneal characteristics. Your surgeon will advise which suits your eyes.
How long until I see clearly after PRK? Vision is hazy for the first several days, improves over the following weeks, and typically reaches its full, stable result within one to three months.
What is TransPRK or TSA? TransPRK (TSA) is a touch-free, single-step version of PRK in which the laser removes the surface layer and reshapes the cornea in one automated process.
Find out if PRK is right for you
PRK is a proven, effective procedure that suits many patients beautifully — sometimes better than LASIK. The only way to know is a personalized assessment. Whichever procedure turns out to fit your eyes best, the assessment gives you a clear, evidence-based answer with no obligation attached. Book a consultation with Clarity Laser Vision in Calgary for a full evaluation and an honest recommendation tailored to your eyes.
This article is for general educational purposes and does not constitute medical advice. Only a qualified eye surgeon can determine the right procedure for you after a complete examination.
