What Are the Side Effects of PRK? | Lasik Awards

Quick Answer

The most common PRK side effects are light sensitivity, blurred vision, glare and halos around lights, dry eye, and corneal haze during the recovery period. Most side effects are temporary and resolve within 3–6 months as the cornea heals. Rare but serious side effects include significant corneal haze affecting vision quality, infection, and post-operative corneal ectasia. Risk of serious complications is low when patients are properly screened and operated on by experienced surgeons.

Detailed Explanation

PRK side effects divide neatly into two categories: expected, temporary effects that are part of normal healing, and uncommon or rare effects that represent genuine complications. Understanding both is essential for informed consent.

Expected Side Effects During Recovery

These effects occur in the majority of PRK patients and are not complications — they are the normal experience of corneal surface healing.

Blurred and fluctuating vision (weeks 1–12) Clear vision does not arrive immediately after PRK. The corneal surface is healing and remodeling, which causes visual fluctuation. Morning vision is often blurrier than afternoon vision as the cornea is slightly more swollen after sleeping. Most patients achieve functional vision within 1–2 weeks and stable 20/20 or better within 1–3 months.

Light sensitivity / photophobia (days 1–14) The exposed epithelial surface during early healing is highly sensitive to light. Bright sunlight and indoor fluorescent lighting can cause significant discomfort. UV-blocking sunglasses are required outdoors during the entire healing period.

Glare and halos (weeks 1–12) As the epithelium heals and the stroma remodels, light scatter at the corneal surface causes visual phenomena — including halos around light sources, starburst patterns, and ghosting. These are most prominent at night during weeks 2–8 and resolve progressively for most patients.

Dry eye symptoms (weeks 1–6) PRK severs some superficial corneal nerve fibers, reducing tear reflex sensitivity temporarily. This can cause a foreign-body sensation, fluctuating vision, and discomfort. Artificial tears are used frequently during this phase (every 1–2 hours for many patients). Symptoms typically improve as corneal nerves regenerate over 3–6 months.

Discomfort and pain (days 1–5) The peak discomfort phase of PRK recovery — particularly days 2–3 — is characterized by burning, grittiness, and aching. This is the most commonly underestimated aspect of PRK recovery. It resolves substantially by day 5–7 when the bandage contact lens is removed.

Less Common Side Effects

Corneal haze (1–5% of cases) Sub-epithelial haze is a normal component of stromal healing, but in some patients it becomes clinically significant — dense enough to affect vision quality. Higher prescriptions and patients who do not use steroid drops as directed carry higher haze risk. Mitomycin-C (MMC) applied during PRK surgery significantly reduces the incidence of clinically meaningful haze. Existing haze, if significant, can be treated with topical steroids or surgical removal.

Undercorrection or overcorrection (5–10% of cases) The cornea’s healing response is not perfectly predictable. Some patients heal in ways that leave them with residual myopia, hyperopia, or astigmatism after PRK. This is not a complication per se — it is biological variability. Most cases are mild and can be addressed with spectacles, contact lenses, or a PRK enhancement if sufficient corneal tissue remains.

Regression (variable, higher with high myopia) Partial return toward the original prescription — myopic regression — occurs in a subset of patients, particularly those treated for higher prescriptions. The first 12–18 months are the most common window for regression. If significant, enhancement surgery may be indicated.

Rare but Serious Side Effects

Corneal infection (keratitis) The exposed epithelial surface during the first 3–5 days of PRK recovery creates a window for bacterial infection. Prophylactic antibiotic drops are used immediately post-surgery to minimize this risk. Infection rates in published series are below 0.1%.

Post-operative ectasia Ectasia — progressive corneal thinning and bulging — is the most serious potential complication of any laser refractive surgery. It results from insufficient residual corneal tissue or from undetected pre-operative corneal weakness (subclinical keratoconus). Thorough pre-operative screening with corneal tomography is the primary preventive measure. Ectasia rates in properly screened patients are very low (estimated 0.02–0.04%).

Persistent dry eye disease Most PRK patients experience temporary dry eye that resolves. A small percentage develop chronic dry eye that requires long-term management with lubricating drops, punctal plugs, or prescription drops such as cyclosporine.

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Important Considerations

Most side effects are duration-dependent, not severity-dependent. The difference between a difficult PRK recovery and an easy one is usually timeline, not permanent damage. Patience and compliance with the drop schedule are the two most effective tools a patient controls.

Night vision effects deserve special attention. Some patients retain persistent halos or starbursts at night beyond 6 months. The incidence of clinically significant night vision disturbance is higher in patients treated for larger prescriptions and those with larger natural pupil sizes. Discuss your pupil size and night vision expectations explicitly before surgery.

Steroid drop compliance directly affects haze risk. Patients who stop steroid drops early or use them inconsistently have measurably higher rates of clinically significant haze. The drop schedule is not optional.

Sun exposure during healing increases haze risk. UV radiation stimulates fibroblast activity in the healing stroma, promoting haze formation. UV-blocking sunglasses with wraparound coverage are required for the first 6–12 months post-PRK.

What to Do Next

1. Review the full recovery timeline. Understanding which side effects occur at which stage helps calibrate expectations. How Long Does PRK Recovery Take provides a week-by-week breakdown.

2. Discuss your pupil size with your surgeon. Patients with large natural pupils have higher rates of persistent night vision phenomena. Your surgeon’s diagnostic workup should include pupil measurement under low-light conditions.

3. Ask specifically about the MMC protocol. Confirm that mitomycin-C will be used during your procedure to reduce haze risk.

4. Prepare for the recovery period. How Do I Prepare for PRK Surgery covers everything to have ready before surgery day.