Both LASIK and PRK correct refractive errors using an excimer laser to reshape the cornea, and both procedures achieve similar long-term visual outcomes. The main differences lie in how the surface of the eye is treated, how long recovery takes, and which patients are the best candidates. Understanding these distinctions helps you have a more informed conversation with your eye surgeon.
How Each Procedure Works
In LASIK (Laser-Assisted In Situ Keratomileusis), the surgeon first creates a thin flap in the outer layer of the cornea using either a microkeratome blade or a femtosecond laser. This flap is folded back, the underlying corneal tissue is reshaped with the excimer laser, and then the flap is replaced. The flap acts as a natural bandage, protecting the treated area and dramatically speeding up recovery.
In PRK (Photorefractive Keratectomy), there is no flap. The outermost layer of corneal cells — the epithelium — is gently removed to expose the stroma below. The excimer laser then reshapes the cornea directly, and the epithelium regenerates naturally over several days. A soft bandage contact lens is placed on the eye after surgery to protect the surface during healing.
Recovery Time
LASIK recovery is notably faster. Most patients see clearly within 24 hours of surgery and can return to work and most normal activities the following day. Discomfort is usually mild and brief.
PRK recovery takes longer. Vision is often blurry for three to five days while the epithelium regrows, and full, stable vision may take three to six weeks. The first few days after PRK can involve moderate discomfort. However, once healing is complete, the visual outcomes are equivalent to LASIK.
Who Is a Better Candidate for Each?
LASIK suits most patients with adequate corneal thickness, mild to moderate prescriptions, and no significant dry eye issues. Patients who cannot have LASIK — because their corneas are too thin, because they have irregular corneal shape, or because they are at higher risk for corneal instability — are often excellent PRK candidates. PRK is also strongly preferred for people in active military or contact sports, where an eye impact could potentially dislodge a LASIK flap.
Patients with severe dry eye may recover better from PRK, as LASIK does temporarily reduce corneal nerve density more significantly. Both procedures can be performed on patients with myopia, hyperopia, and astigmatism within certain prescription ranges.
Long-Term Outcomes
Studies consistently show that LASIK and PRK produce similar rates of 20/20 or better vision after healing is complete. Both procedures are stable and durable over decades for the vast majority of patients. Enhancement procedures are available for both if vision changes over time.
Making the Right Choice
The best procedure for you depends on your prescription, corneal anatomy, lifestyle, and tolerance for recovery time. A pre-operative screening — which includes corneal topography, pachymetry (corneal thickness measurement), and pupil assessment — will determine which option is safer and more appropriate for your eyes.
To learn more about laser vision correction at Vision Center, visit our LASIK and laser vision services page. You can also use our LASIK cost calculator to get a rough sense of what the procedure might cost in your area.