What Is the Success Rate of TransPRK?

What Is TransPRK? A Quick Overview

TransPRK (Trans-Epithelial Photorefractive Keratectomy) is a surface-based laser eye surgery that corrects myopia, hyperopia, and astigmatism without creating a corneal flap or touching the eye with any instrument. The excimer laser removes the epithelium (the cornea’s thin outermost layer) and reshapes the underlying stroma in a single continuous step. After treatment, the epithelium regenerates naturally over 3–5 days, acting as a biological bandage. For a detailed explanation of the mechanics, see our dedicated article on what TransPRK eye surgery involves.

The key distinction from LASIK and SMILE is the absence of a flap or lenticule extraction. No blade, no suction ring, no mechanical contact with the cornea — which is why TransPRK is often described as the safest structural approach to laser vision correction. This matters especially for athletes, military personnel, and anyone with thinner corneas who may not be candidates for Femto LASIK or SMILE Pro.

TransPRK Success Rate: What the Studies Say

The Headline Number: 93–95%

A meta-analysis of 11 studies encompassing over 1,170 eyes found that 93% of TransPRK patients achieved postoperative uncorrected visual acuity (UCVA) of 20/20 or better. A separate Singaporean study with 12-month follow-up reported an even higher figure: 94.3% of patients reaching 20/20 or better, with a significant proportion achieving 20/16 — sharper than what’s considered “normal” vision.

What Does “Success” Actually Mean?

In refractive surgery research, success is typically defined as achieving UCVA of 20/20 or better without glasses or contacts. Some studies also measure the percentage of eyes within ±0.50 dioptre of the intended correction (called “accuracy”) — and TransPRK consistently delivers accuracy rates above 90%. The remaining patients usually achieve 20/25 or 20/30, which is still functional for most daily activities without correction.

Long-Term Stability

One concern patients raise is whether TransPRK results hold over time. Studies with 3–5 year follow-ups confirm that the correction remains stable for the vast majority of patients, provided the original eligibility criteria were met — particularly prescription stability. If you’re curious whether surface-based procedures offer lasting outcomes, our article on whether TransPRK is a permanent solution covers the long-term evidence in detail.

How TransPRK Compares to LASIK and SMILE Pro

Patients often want to know: if TransPRK’s success rate is 93–95%, how does that stack up against other laser procedures? The answer is that final visual outcomes are remarkably similar across all three — the real differences lie in recovery speed, structural impact, and candidacy profiles.

Visual Outcomes

LASIK achieves 20/20 in roughly 96% of patients. SMILE Pro reports similar figures in the 94–98% range. TransPRK’s 93–95% is statistically comparable when you account for study methodology differences. The bottom line: all three procedures deliver excellent vision correction. For a side-by-side breakdown of how these procedures differ in approach, our TransPRK vs LASIK vs SMILE comparison covers every dimension.

Recovery Timeline

This is where TransPRK diverges. Because the epithelium must regenerate after surgery, functional vision takes 3–5 days to return and full stabilisation can take 1–3 months. LASIK patients typically see clearly within hours. SMILE Pro falls in between. For patients who can plan 5–7 days of downtime, the slower recovery is a worthwhile trade-off for the structural advantages. More detail on what the healing process looks like is available in our TransPRK recovery guide.

Corneal Integrity

TransPRK preserves more corneal structural integrity than any flap-based procedure. No flap means no risk of flap dislocation — ever. For contact sport athletes, military personnel, or anyone concerned about traumatic impact, this is a decisive advantage. It’s also the reason TransPRK is often the procedure of choice at Visual Aids Centre for patients whose corneal thickness is borderline for LASIK eligibility.

Factors That Influence Your TransPRK Outcome

Prescription Severity

TransPRK delivers the most predictable results for low-to-moderate myopia (up to –6.00 D). Higher prescriptions still achieve good outcomes, but the probability of needing an enhancement procedure increases slightly. Understanding your myopia power limits helps set realistic expectations.

Corneal Thickness and Shape

Since TransPRK removes tissue from the corneal surface rather than from within a flap, it requires less total corneal depth than LASIK. This makes it viable for patients with corneas as thin as 450 microns — a population often excluded from flap-based procedures. Pre-operative corneal mapping with Pentacam tomography is essential for accurate planning.

Surgeon Experience and Technology

TransPRK outcomes are highly technique-dependent. The excimer laser platform used, the ablation profile selected, and the surgeon’s experience with surface ablation all influence the final result. At Visual Aids Centre, TransPRK is performed using advanced excimer laser platforms with high-speed eye tracking and optimised ablation algorithms.

Post-Operative Care Compliance

TransPRK recovery demands more patient involvement than LASIK. Using prescribed steroid drops on schedule, wearing protective eyewear, avoiding UV exposure, and attending follow-up appointments are all critical to preventing corneal haze and achieving optimal results. Patients who follow the aftercare protocol closely consistently report better outcomes. For general guidance on healing, our article on TransPRK safety covers both the risk profile and the aftercare essentials.

Risks and Complications: Putting Them in Perspective

Corneal Haze

The most frequently discussed risk is corneal haze — a mild clouding of the cornea during the healing phase. Published studies report clinically significant haze in only 3–5% of cases, and the vast majority of these resolve with medication within a few months. Prophylactic use of mitomycin-C (MMC) during the procedure has dramatically reduced haze rates in modern TransPRK protocols.

Temporary Discomfort

Because the epithelium is removed, patients experience 2–3 days of discomfort (described as a gritty, watery sensation) while the surface regenerates. This is managed effectively with bandage contact lenses, lubricating drops, and pain medication. It’s more uncomfortable than LASIK but far from the ordeal some patients fear.

Dry Eye

Temporary dry eye occurs with all refractive procedures. TransPRK actually disrupts fewer corneal nerves than LASIK (since there’s no flap cut), so dry eye symptoms are often milder and shorter-lived. If you’re already prone to dry eye symptoms, this is worth discussing with your surgeon during the consultation.

Under- or Over-Correction

A small percentage of patients may end up slightly under- or over-corrected. In most cases, a single enhancement procedure performed after 6–12 months resolves the residual error. The overall enhancement rate for TransPRK is comparable to other laser procedures — typically under 5%.

Who Benefits Most from TransPRK?

While TransPRK is suitable for most refractive surgery candidates, certain patient profiles gain a particular advantage. Individuals with thin corneas who fall below LASIK’s minimum thickness threshold find TransPRK to be their best laser option. People in physically demanding occupations — defence services, contact sports, first responders — benefit from the absence of a flap that could be displaced by trauma. Patients with mild corneal surface irregularities or previous ocular surface disease often do better with TransPRK’s surface approach. And those who travel frequently and want to avoid the downtime restrictions of more complex procedures may prefer TransPRK’s simpler recovery profile once the initial epithelial healing is complete.

If you’re weighing TransPRK against other flapless options, our comparison of SMILE Pro vs TransPRK highlights the specific trade-offs between these two procedures.