Modern PRK Laser Eye Surgery: A Complete Patient Guide
Discover how modern PRK offers an established, flap-free approach to laser vision correction — and why it may be a suitable alternative to LASIK for certain patients.
Imagine waking up in the morning and being able to see your surroundings without immediately reaching for your glasses. Or enjoying outdoor activities, travelling and exercising with less dependence on contact lenses.
For many people, laser vision correction offers the possibility of greater visual freedom.
While LASIK is perhaps the most widely recognised laser eye surgery, another established procedure deserves just as much attention: Photorefractive Keratectomy (PRK).
PRK has been used successfully for decades. Thanks to advances in laser technology, diagnostic imaging and surgical planning, modern PRK remains an important option for patients seeking to reduce their dependence on glasses or contact lenses.
At Dr Mark Deist Eye Care, based at Sandhurst Eye Centre in Sandton, Johannesburg, PRK forms part of a range of refractive surgical options available to suitable patients.
But what exactly is PRK, how does it compare with LASIK, and could it be the right procedure for your eyes?
Let's explore.
What Is PRK Laser Eye Surgery?
PRK (Photorefractive Keratectomy) is a laser vision correction procedure that reshapes the cornea — the transparent, curved front surface of the eye — to improve how light focuses on the retina.
When the eye doesn't focus light correctly, the result is a refractive error, which may cause blurred vision.
PRK can be used to correct common refractive errors, including:
Myopia (short-sightedness): Difficulty seeing distant objects clearly.
Hyperopia (long-sightedness): A focusing error that can affect near vision and sometimes distance vision.
Astigmatism: Blurred or distorted vision caused by irregular curvature of the cornea or lens.
By carefully reshaping the cornea with a specialised excimer laser, PRK aims to improve the eye's natural focusing ability.
The goal is to reduce dependence on spectacles or contact lenses, although complete spectacle independence cannot be guaranteed.
What Makes PRK Different?
Unlike LASIK, which involves creating a thin flap in the cornea before laser reshaping, PRK is a surface-based, flap-free procedure.
During PRK, the thin outermost layer of the cornea, known as the epithelium, is removed or displaced before the laser treatment.
The excimer laser then reshapes the underlying corneal tissue according to the patient's individual prescription and treatment plan.
The epithelium naturally regenerates during the healing process.
This difference is important because it makes PRK a potential alternative for certain patients whose corneal characteristics or lifestyle make LASIK less suitable.
Modern PRK: An Established Procedure Enhanced by Technology
PRK was among the earliest forms of excimer laser vision correction.
Although LASIK later became popular because of its faster initial visual recovery, PRK has continued to evolve.
Today's PRK procedures benefit from advances in several important areas.
1. Advanced Excimer Laser Technology
Modern excimer lasers can remove microscopic amounts of corneal tissue with considerable precision.
This allows the surgeon to reshape the cornea according to the patient's measured refractive error.
Contemporary laser systems may also incorporate sophisticated eye-tracking technology to help maintain accurate treatment alignment.
2. Detailed Corneal Mapping
Before surgery, advanced diagnostic instruments can create detailed maps of the corneal surface.
These measurements help identify irregularities, evaluate corneal shape and assess whether laser vision correction is appropriate.
Corneal topography and tomography are particularly valuable when screening for conditions such as keratoconus or other forms of corneal instability.
3. Individualised Treatment Planning
No two eyes are identical.
Modern refractive surgery considers more than just a spectacle prescription.
Depending on the technology available and the patient's clinical findings, treatment planning may incorporate corneal shape, thickness, optical characteristics and individual visual requirements.
4. Improved Postoperative Care
Modern postoperative treatment protocols, protective contact lenses and appropriate medication help support corneal healing and patient comfort.
However, PRK still involves a longer initial recovery than LASIK, and patients should plan accordingly.
The important distinction is that modern technology improves surgical planning and precision, but it does not eliminate the risks or healing requirements associated with PRK.
PRK vs LASIK: What's the Difference?
One of the most common questions patients ask is:
"Which is better — PRK or LASIK?"
The answer depends on your eyes.
Both procedures use an excimer laser to reshape the cornea, but they differ in how the surgeon accesses the tissue being treated.
Feature | PRK | LASIK |
Surgical technique | Surface treatment | Corneal flap created |
Corneal flap | No | Yes |
Initial visual recovery | Slower | Generally faster |
Early postoperative discomfort | Usually more noticeable | Usually less |
Potential suitability for thinner corneas | May be preferable in selected cases | Requires sufficient corneal thickness |
Flap-related complications | None | Possible |
Long-term visual outcomes | Often comparable in appropriately selected patients | Often comparable in appropriately selected patients |
Follow-up and healing | Longer surface-healing period | Faster initial recovery |
Why Might PRK Be Recommended Instead of LASIK?
For some patients, avoiding the creation of a corneal flap offers meaningful advantages.
PRK may be considered when:
The cornea is thinner than ideal for LASIK, but still suitable for safe laser treatment.
A patient's occupation or sporting activities increase the likelihood of direct eye trauma.
Corneal measurements suggest surface treatment may be preferable.
A previous refractive procedure requires careful consideration of additional correction.
However, PRK is not automatically safe simply because LASIK is unsuitable.
Patients with abnormal corneal shape, keratoconus, insufficient corneal thickness or other risk factors may be unsuitable for both procedures.
This is why comprehensive screening is essential.
Who Is a Good Candidate for PRK?
PRK may be suitable for adults who want to reduce their dependence on glasses or contact lenses and meet the necessary clinical criteria.
An ideal candidate generally has:
A stable spectacle prescription.
Healthy corneas with suitable thickness and shape.
No significant untreated eye disease.
A refractive error within the treatable range.
Good general eye health.
Realistic expectations about the results and recovery process.
What If I Have Thin Corneas?
Corneal thickness is an important consideration in laser vision correction.
LASIK requires the creation of a flap, followed by reshaping of the underlying corneal tissue.
PRK does not require a flap, which can make it an option for some patients with thinner corneas.
However, the laser still removes corneal tissue, and adequate residual corneal strength must be maintained.
Having thin corneas does not automatically mean you qualify for PRK.
Detailed measurements are needed to determine whether any corneal laser procedure is appropriate.
What If I Have Dry Eyes?
Dry eye disease is another important consideration.
Both PRK and LASIK can cause or worsen dry eye symptoms, although their effects on corneal nerves and the tear film differ.
If you already experience burning, gritty sensations, fluctuating vision or excessive watering, these symptoms should be investigated before surgery.
At Dr Mark Deist Eye Care, the dedicated on-site Dry Eye Clinic provides advanced diagnostic assessments, including IDRA dry eye analysis and TearLab testing.
Identifying and managing dry eye disease before refractive surgery may help improve the ocular surface and support more reliable measurements.
What If I Have Keratoconus?
Keratoconus is a condition in which the cornea progressively becomes thinner and changes shape, potentially causing irregular astigmatism and distorted vision.
Routine PRK is generally unsuitable for patients with keratoconus because removing corneal tissue may further compromise corneal stability.
In carefully selected cases, specialist surgeons may consider particular surface laser treatments in combination with corneal cross-linking. These are different from standard PRK and require individual assessment.
Dr Deist has a particular interest in the diagnosis and surgical management of keratoconus and other complex corneal conditions.
What Happens During PRK Laser Eye Surgery?
Although the idea of laser eye surgery may seem intimidating, PRK is generally performed as an outpatient procedure.
The laser treatment itself is relatively brief, although preparation and postoperative care take additional time.
Step 1: Numbing the Eye
Anaesthetic eye drops are administered to numb the surface of the eye.
An instrument gently holds the eyelids open to prevent blinking during treatment.
Step 2: Preparing the Corneal Surface
The surgeon removes the thin outer epithelial layer of the cornea.
Depending on the technique used, this may be performed mechanically, with an alcohol-assisted method or with laser assistance.
Step 3: Excimer Laser Reshaping
The excimer laser reshapes the cornea according to the predetermined treatment plan.
The laser changes the cornea's curvature to improve how light is focused inside the eye.
Step 4: Protecting the Healing Surface
A protective bandage contact lens is usually placed over the cornea.
This helps protect the surface while the epithelial cells regenerate.
Step 5: Recovery and Follow-Up
Patients return home after surgery with prescribed eye drops and detailed postoperative instructions.
Follow-up appointments are essential to monitor healing, assess vision and determine when the bandage contact lens can safely be removed.
PRK Recovery: What Should You Expect?
One of the most important differences between PRK and LASIK is the recovery period.
PRK generally requires more patience during the first few days after surgery.
Because the outer corneal layer needs to regenerate, discomfort and blurred vision are common during early healing.
A Typical PRK Recovery Timeline
Recovery period | What patients may experience |
First 24 hours | Blurred vision, watering, light sensitivity and discomfort |
Days 2–3 | Discomfort may be most noticeable as the surface heals |
Days 3–5 | The epithelium generally closes; the protective contact lens may be removed when healing is confirmed |
First 1–2 weeks | Vision gradually improves, although fluctuations are common |
Weeks 2–4 | Many patients notice further improvements in visual clarity |
1–3 months | Vision continues to stabilise; some patients take longer |
3–6 months | Further refinement and stabilisation may occur, particularly in certain prescriptions |
These timeframes are approximate. Individual healing and visual recovery vary.
Is PRK Painful?
During the procedure, anaesthetic eye drops help minimise discomfort.
After the anaesthetic wears off, patients commonly experience irritation, watering, light sensitivity and discomfort while the corneal surface heals.
Symptoms are often most noticeable during the first two to three days.
Your surgeon will prescribe appropriate medication and eye drops to support healing and manage discomfort.
When Can I Return to Work?
Many patients need several days away from work, and some may require a week or longer depending on their recovery and occupational demands.
Patients who work extensively on computers, drive frequently or perform visually demanding tasks may need additional time.
Driving should only resume once vision meets the necessary legal standard and your surgeon confirms that it is appropriate.
Important Recovery Advice
During recovery:
Use prescribed medication exactly as directed.
Attend all scheduled follow-up appointments.
Avoid rubbing your eyes.
Wear recommended sunglasses outdoors.
Avoid swimming and activities that could expose healing eyes to contamination until cleared by your surgeon.
Do not remove the protective contact lens yourself unless specifically instructed.
Contact your ophthalmologist promptly if symptoms worsen unexpectedly.
Increasing pain, worsening vision, significant redness or unusual discharge require urgent medical attention.
What Results Can You Expect from PRK?
The primary aim of PRK is to improve uncorrected vision and reduce reliance on spectacles or contact lenses.
Many appropriately selected patients achieve substantial improvements in their distance vision.
According to the American Academy of Ophthalmology, approximately 90% of PRK patients achieve 20/40 vision or better without glasses or contact lenses.
However, outcomes depend on factors including the original prescription, corneal characteristics, healing response and individual eye health.
Some patients may still require glasses for particular activities.
Will I Have Perfect Vision After PRK?
No refractive surgery can guarantee perfect vision.
Although many patients achieve excellent results, some may experience residual short-sightedness, long-sightedness or astigmatism.
Occasionally, additional correction may be considered after vision has stabilised, provided it is clinically appropriate.
Will I Still Need Reading Glasses?
Possibly.
PRK reshapes the cornea, but it does not stop the natural ageing process of the eye's internal lens.
From around the age of 40, many people develop presbyopia, a gradual reduction in the ability to focus on nearby objects.
Consequently, someone who undergoes successful PRK for distance vision may still require reading glasses later in life.
This is an important part of preoperative counselling, particularly for patients approaching their forties.
Are There Risks or Side Effects Associated with PRK?
Like all surgical procedures, PRK carries potential risks.
While many patients recover successfully, possible complications include:
Temporary or persistent dry eye symptoms.
Glare, halos or difficulty with night vision.
Delayed epithelial healing.
Corneal haze or scarring.
Infection or inflammation.
Undercorrection or overcorrection.
Regression of the refractive result.
Rare changes in corneal stability.
Rare permanent reduction in best-corrected vision.
Some complications can have lasting effects on visual quality.
Careful patient selection, accurate preoperative measurements and appropriate postoperative management are important in reducing avoidable risks.
Patients should understand both the potential benefits and limitations before deciding to undergo surgery.
Can PRK Correct Astigmatism?
Yes.
Modern PRK can treat many forms of regular astigmatism.
Astigmatism occurs when the eye's optical surfaces do not focus light evenly, often resulting in blurred or distorted vision.
By reshaping the cornea, the excimer laser can reduce the refractive error associated with suitable forms of astigmatism.
However, not all astigmatism is suitable for laser correction.
Irregular astigmatism associated with conditions such as keratoconus requires specialised assessment and may need different treatment strategies.
Is PRK Better for Active Lifestyles?
PRK can be attractive to certain individuals with active lifestyles because it does not involve creating a corneal flap.
For example, people participating in contact sports or occupations where eye trauma is possible may benefit from avoiding flap-related risks.
However, PRK does not make the eyes immune to injury, and appropriate eye protection remains important.
The best surgical option depends on individual circumstances rather than lifestyle alone.
PRK, LASIK or Another Refractive Procedure: Which Is Right for You?
PRK and LASIK are not the only options available to patients interested in reducing their dependence on spectacles.
Depending on age, prescription, corneal health and individual visual requirements, other procedures may be considered.
These include:
LASIK: A flap-based laser vision correction procedure generally associated with faster initial visual recovery.
Implantable Collamer Lens (ICL) surgery: A procedure in which a specially designed lens is implanted inside the eye without removing the natural crystalline lens. It may be suitable for selected patients, including some with higher prescriptions.
Refractive Lens Exchange (RLE): A procedure that replaces the natural lens with an artificial intraocular lens, often considered for selected patients with age-related focusing changes or other specific visual requirements.
Each procedure has distinct benefits, limitations and risks.
The best refractive procedure is not necessarily the newest or most popular one — it is the one most appropriate for your eyes.
Why Choose Dr Mark Deist for Your Refractive Surgery Assessment?
Choosing refractive surgery begins with choosing an ophthalmologist who understands both the possibilities and limitations of modern eye surgery.
Dr Mark Deist is a specialist ophthalmologist and refractive and corneal surgeon based at Sandhurst Eye Centre in Sandton, Johannesburg.
With extensive experience in anterior segment surgery, his clinical interests include laser vision correction, corneal transplantation, keratoconus management and advanced refractive procedures.
His approach involves evaluating each patient's ocular health, visual requirements and treatment suitability before recommending an appropriate option.
For some patients, that may be LASIK.
For others, PRK or another refractive procedure may be more appropriate.
And for certain patients, surgery may not be advisable.
A thorough assessment is essential to making an informed decision.
Frequently Asked Questions About PRK Laser Eye Surgery
1. Is PRK an outdated form of laser eye surgery?
No. Although PRK has been performed for decades, it remains an established refractive procedure. Advances in diagnostic imaging, excimer laser technology and treatment planning continue to support its role in modern eye care.
2. Is PRK safer than LASIK?
Neither procedure is universally safer. PRK avoids flap-related complications, but it has its own risks, including surface-healing problems and corneal haze. Safety depends on the patient's individual eye characteristics and clinical suitability.
3. How long does PRK surgery take?
The laser treatment itself generally takes only a short time. The overall appointment is longer because of preparation, assessment and postoperative care.
4. How long does it take to see clearly after PRK?
Vision usually improves gradually over days and weeks. Some patients achieve good functional vision relatively quickly, while others require several weeks or months for their vision to stabilise.
5. Can both eyes be treated on the same day?
Both eyes can sometimes be treated during the same session, depending on the patient's circumstances and the surgeon's recommendation.
6. Does PRK permanently correct vision?
PRK produces a lasting change in corneal shape. However, natural ageing, changes in the eye and refractive regression can affect vision over time. Additional spectacles or other treatment may eventually be needed.
7. Can I have PRK if I have a high prescription?
Possibly, but higher prescriptions require greater corneal tissue removal and may increase certain risks. Some patients may be better suited to an alternative such as ICL surgery.
8. Can PRK be performed if I have dry eyes?
Mild or manageable dry eye does not necessarily exclude every patient, but dry eye disease should be carefully assessed and appropriately treated before surgery. Significant dry eye may make refractive surgery unsuitable.
9. Is PRK suitable for patients over 40?
Age alone does not automatically exclude someone from PRK. However, presbyopia, early cataract changes and other age-related factors may influence which procedure offers the most appropriate outcome.
10. How much does PRK cost in Johannesburg?
The cost of PRK can depend on the individual treatment plan, surgical facility, technology used and postoperative care arrangements.
Patients should contact the practice for information about consultations, suitability assessments and applicable surgical fees.
Take the First Step Towards Clearer Vision
Modern PRK demonstrates that established surgical techniques can remain highly relevant when combined with contemporary technology and careful patient selection.
For certain patients, particularly those who may not be ideal candidates for LASIK, PRK offers an alternative approach to laser vision correction.
Although recovery takes longer than LASIK, suitable patients may achieve meaningful improvements in their vision and reduced dependence on glasses or contact lenses.
The first step is understanding your eyes and exploring which options may be appropriate for you.
Book Your Refractive Surgery Consultation
If you're considering PRK, LASIK or another form of vision correction, contact Dr Mark Deist Eye Care to arrange a comprehensive assessment.
Dr Mark Deist — Ophthalmic Surgeon
📍 Sandhurst Eye Centre53 Saxon Road, Sandhurst, Sandton, 2196Johannesburg, South Africa
📞 011 217 7520📧 deist@icon.co.za🌐 www.drmarkdeist.com
Your eyes are unique. Your vision correction should be too.
Medical disclaimer: This article provides general educational information and is not a substitute for professional ophthalmic advice. PRK suitability, potential benefits, recovery and risks must be evaluated individually during a comprehensive eye examination.
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