LASEK is one of the safest elective procedures in modern medicine. Over 99% of patients achieve functional vision (better than 20/40) afterward, and more than 90% reach 20/20 or better. Serious complications are exceptionally rare, and LASEK actually avoids some of the risks associated with its more popular cousin, LASIK.
How LASEK Differs From LASIK
Both LASEK and LASIK use the same excimer laser to reshape your cornea and correct nearsightedness, farsightedness, or astigmatism. The key difference is how the surgeon accesses the cornea. LASIK involves cutting a flap through the deeper layers of the cornea, folding it back, applying the laser, then replacing the flap. LASEK is a surface procedure: the surgeon loosens only the thin outermost skin of the cornea (the epithelium), moves it aside, reshapes the surface with the laser, then lets the epithelium grow back on its own.
That distinction matters for safety. Because LASEK doesn’t create a deep corneal flap, it eliminates an entire category of complications that only LASIK patients face: flap displacement, flap wrinkling (called striae), inflammation at the flap interface, and cell migration under the flap. In one comparative study, none of the LASEK eyes experienced corneal flap striae, while 5 out of 39 LASIK eyes did. A Cochrane review confirmed that visual outcomes and safety at one year are similar between the two techniques, but only LASIK carries the risk of flap-related problems.
Serious Complications Are Extremely Rare
The complication people worry about most is corneal ectasia, a progressive bulging and thinning of the cornea that can seriously impair vision. A systematic review of the global literature found that ectasia after surface procedures like LASEK occurs in roughly 20 per 100,000 eyes, compared to 90 per 100,000 for LASIK. To put that in perspective, the LASEK ectasia rate is 0.02%. The review could identify only a single reported case of ectasia specifically after LASEK in the entire published literature.
Infection during healing is the other serious concern. LASEK leaves the corneal surface temporarily exposed while the epithelium regenerates, which takes about four to five days. Despite this vulnerability window, LASEK has the lowest infection rate of all refractive surgeries. A meta-analysis calculated the incidence of infectious keratitis after LASEK at 0.000046%, roughly 12 times lower than after LASIK (0.000554%). The contact lens placed on the eye during healing and the use of antibiotic drops help keep that number vanishingly small.
Common Side Effects During Recovery
The tradeoff for LASEK’s safety advantages is a longer, more uncomfortable recovery. Because the surface epithelium needs to regenerate, most people experience moderate discomfort or a gritty sensation for the first three to five days. Vision is blurry during this period and gradually sharpens over several weeks. Full visual stabilization can take one to three months, compared to a day or two with LASIK.
Dry eye is the most common side effect of any laser vision correction. With LASIK, it affects 60 to 70% of patients because the flap cuts through corneal nerves that regulate tear production. LASEK disrupts fewer of these nerves since it works only on the surface, so dry eye tends to be less severe and resolves faster, though it still occurs. Most people use lubricating eye drops for several weeks to a few months after the procedure.
About 20% of patients report some form of visual disturbance after laser eye surgery, including glare, halos around lights, or starburst patterns, especially at night. These symptoms are most noticeable in the first few months and typically improve as the cornea heals. They’re more common in people with large pupils or high prescriptions.
Long-Term Stability
A 10-year follow-up study tracking patients after surface ablation procedures found no long-term complications. Vision does drift slightly over a decade, which is expected since the eye continues to change with age. In the surface ablation group, the average prescription shifted by about one diopter over 10 years, a modest regression that most people wouldn’t notice day to day. If a meaningful amount of vision does regress, enhancement procedures are actually simpler with LASEK than LASIK because there’s no old flap to lift and reposition.
Who Should Avoid LASEK
LASEK isn’t safe for everyone. Certain conditions interfere with how the cornea heals, and a thorough screening before surgery is what keeps complication rates so low. You’re generally not a good candidate if you have:
- Keratoconus or very thin corneas. Reshaping an already weakened or thin cornea raises the risk of ectasia. Surgeons want to ensure enough corneal tissue remains intact after the procedure, typically leaving at least 275 microns of tissue beneath the treatment zone.
- Autoimmune diseases such as lupus or rheumatoid arthritis, or immunodeficiency conditions like HIV. These can prevent proper healing.
- Active eye conditions including glaucoma, uveitis, herpes simplex involving the eye, or chronic eyelid inflammation (blepharitis), which increases infection risk.
- Unstable prescriptions. If your vision is still changing, correcting it now means it will likely shift again.
- Certain medications including steroids and some acne treatments that affect corneal healing.
Diabetes can also complicate healing, so it needs to be well controlled and discussed with your surgeon beforehand.
Why LASEK Is Often Recommended for Active People
Because LASEK doesn’t create a permanent corneal flap, there’s no risk of that flap being dislodged by a blow to the face months or years later. This is why surface ablation procedures are specifically recommended for athletes, police officers, military personnel, and anyone whose lifestyle involves a higher chance of head or facial trauma. The Cochrane review explicitly noted this as a reason to choose LASEK over LASIK. Once the surface epithelium heals completely, the cornea is structurally intact in a way that a LASIK flap never fully is.
What Determines Your Outcome
The biggest factor in LASEK safety isn’t the procedure itself. It’s the screening. Virtually every serious complication in the published literature traces back to a risk factor that existed before surgery: a cornea that was too thin, an early sign of keratoconus that was missed, or a prescription that was too high for the amount of corneal tissue available. Modern screening includes detailed corneal mapping, thickness measurements, and a full medical and ocular history specifically to catch these issues.
Your own behavior during recovery also matters. Following the prescribed schedule of antibiotic and anti-inflammatory drops, avoiding rubbing your eyes, keeping water out of your eyes for the first week, and attending follow-up appointments all reduce the already low risk of complications further. The first postoperative visit, usually the day after surgery, is particularly important for catching any early signs of infection or healing problems.