Introduction

But when people sit down in our consultation room at Jryn Eye Clinic in Busanjin-gu, Busan, one question surfaces more than any other:

“Doctor, which one hurts less—SMILE or LASIK?”

It’s an honest concern. Eyes are precious, and even the thought of discomfort can make surgery feel intimidating. The truth, though, is more reassuring than many expect. Modern laser vision correction isn’t about pain—it’s about precision, comfort, and long-term safety.

In this article, we’ll explore what patients really feel during and after both SMILE and LASIK, why the comfort levels differ, and how to decide which procedure fits your eyes and your lifestyle.

Setting the Stage: SMILE vs. LASIK in Today’s Korea

In South Korea, eye health is taken seriously. Regular check-ups are common, especially in major cities like Busan, where people live fast-paced, visually demanding lives. From young adults burdened by years of glasses during school, to middle-aged professionals seeking freedom from contacts, the demand for laser vision correction is strong.

The two leading procedures—SMILE (Small Incision Lenticule Extraction) and LASIK (Laser-Assisted In Situ Keratomileusis)—are often mentioned in the same breath. Both have transformed millions of lives worldwide. Both are safe, precise, and effective.

Yet, the patient experience during and after surgery differs in subtle but important ways. And much of that difference comes down to how the eye structures are handled.

What Patients Feel During Surgery

The truth is reassuring: neither SMILE nor LASIK should cause pain during the actual surgery.

Both procedures begin with anesthetic eye drops, which numb the surface of the cornea. By the time the laser starts, the patient’s role is mostly to remain still and follow gentle instructions.

• In LASIK: A femtosecond laser creates a thin flap on the cornea. During this step, patients feel pressure as the suction ring holds the eye steady. Some describe it as “a thumb pressing firmly on the eye,” but not pain. Once the flap is lifted and the excimer laser reshapes the cornea, patients often report seeing flashing lights or a blurry glow. The flap is then repositioned, and the surgery is complete.
• In SMILE: There is no flap. Instead, a femtosecond laser creates a small lenticule (a lens-shaped piece of corneal tissue) inside the cornea. Through a tiny incision, this lenticule is removed. Patients usually notice mild pressure but describe the process as smoother and less “strange” compared to LASIK.

In other words, while both procedures are painless, patients often say SMILE feels gentler and less invasive while in the chair.

The First Hours After Surgery

This is where patients notice the most meaningful difference.

• After LASIK: The first 24–48 hours can bring mild stinging, tearing, or light sensitivity. Because a corneal flap has been created, some patients describe the sensation as “something in the eye” or “scratchiness.” For most, this discomfort eases quickly, and vision stabilizes within a few days.
• After SMILE: With no flap and a smaller incision, the corneal surface is disturbed less. Many patients report only mild dryness or light sensitivity. Some feel comfortable enough to resume daily activities the next day, aside from the usual caution against rubbing the eyes.

At Jryn Eye Clinic, patients often tell us that recovery after SMILE feels surprisingly uneventful—no sharp pain, just a gradual sharpening of vision.

Why SMILE Often Feels More Comfortable

To understand why SMILE tends to cause less discomfort, it helps to think about the cornea’s anatomy.

The cornea is like a dome of glass, full of delicate nerve endings that not only protect the eye but also regulate tear production.

• In LASIK, creating and lifting the corneal flap temporarily cuts through more of these nerves. While they regenerate over time, this explains why dryness or sensitivity can be more noticeable in the weeks following surgery.
• In SMILE, only a small incision is made, and the lenticule is removed from within. Because fewer nerves are affected, the cornea retains more of its natural stability and sensation.

This preservation of corneal nerves is a key reason why SMILE patients report less dryness and a more comfortable healing phase.

Beyond Pain: The Real Deciding Factors

Pain is important, but it should never be the sole deciding factor when choosing a vision correction procedure. The better question is: Which option is safest and most effective for my eyes and my lifestyle?

Here’s what usually guides that decision:

• Corneal Thickness: Patients with thinner corneas may not be suitable for LASIK but could be good candidates for SMILE.
• Degree of Refractive Error: LASIK can treat a wider range of prescriptions in some cases, though SMILE’s indications continue to expand.
• Dry Eye History: For those already suffering from chronic dry eye, SMILE may be the gentler choice.
• Lifestyle Factors: Athletes, military personnel, or individuals at risk of eye trauma may prefer SMILE because there is no corneal flap to be dislodged.

At Jryn Eye Clinic, Dr. Han Sang Yeop carefully evaluates each patient’s corneal maps, tear function, and visual needs before recommending one procedure over the other.

What Patients in Busan Often Say

Local culture influences expectations. In Korea, where technology and precision are highly valued, patients often come in well-researched. They’ve read about SMILE being “flapless” and are curious whether that automatically makes it better.

Our experience shows:

• Patients in their 20s and 30s, especially active young adults, lean toward SMILE for its comfort and quick return to normal routines.

• Patients with higher prescriptions or complex visual needs sometimes still benefit from LASIK, and once reassured about the minimal discomfort, they are equally satisfied with the outcome.

Ultimately, comfort is part of the decision, but clarity of vision and long-term eye health take priority.

Clinical Evidence on Pain and Comfort

Studies comparing LASIK and SMILE support what we see daily in the clinic. Research published in ophthalmology journals consistently shows:

• Lower postoperative discomfort scores in SMILE patients compared to LASIK.

• Reduced incidence of dry eye symptoms in the early months after SMILE.

• Similar or superior visual outcomes between the two procedures.

This alignment between science and patient experience is what makes SMILE an increasingly popular choice, particularly in Asia.

So, Does SMILE Hurt Less?

The honest answer is: Yes, for most patients, SMILE feels more comfortable during and after surgery compared to LASIK.

But here’s the perspective we always share at Jryn Eye Clinic: modern vision correction surgery—whether SMILE or LASIK—is not something patients should fear for pain. Both are virtually painless, both have excellent safety records, and both can deliver life-changing clarity.

The real decision should rest on medical suitability and personal lifestyle—not fear of discomfort.

Conclusion

When it comes to vision correction, the question of pain is natural—but often overestimated. The reality is that both SMILE and LASIK are virtually painless, thanks to advanced laser technology and precise surgical techniques. That said, many patients find SMILE to be gentler, both during the procedure and throughout the recovery phase, largely because it preserves more of the eye’s natural structure.

But choosing between SMILE and LASIK should never be based on comfort alone. The right decision depends on your eye health, corneal structure, daily habits, and long-term visual needs. That’s why a careful, personalized evaluation is essential.

At Jryn Eye Clinic in Busanjin-gu, Busan, Dr. Han Sang Yeop and our team take the time to understand your eyes and your lifestyle before recommending the most suitable option. Whether you’re a student tired of glasses, an athlete who needs flapless safety, or a professional seeking quick recovery, we’ll help you find the path that balances comfort, safety, and clarity.