LASEK (Laser Epithelial Keratomileusis) is a type of laser eye surgery that corrects vision by reshaping the cornea, similar to LASIK and PRK but with a distinct approach to how the surface of the eye is handled during the procedure. It sits in a middle ground between those two more well-known surgeries, preserving a thin layer of tissue that PRK discards while avoiding the deeper corneal cut that LASIK requires. LASEK is most often recommended for people whose corneas are too thin for LASIK or who face higher risks from a traditional LASIK flap.
How the Procedure Works
Every laser vision correction surgery needs to access the cornea, the clear front surface of the eye, so a laser can reshape it. The differences between procedures come down to how the surgeon gets to that corneal tissue.
In LASEK, the surgeon applies a dilute alcohol solution to the surface of the eye. This loosens the epithelium, a paper-thin outer layer of cells that sits on top of the cornea. Using a fine surgical spatula and a gentle lifting motion, the surgeon detaches this epithelial sheet and folds it to one side, keeping it attached to the eye like a hinge. With the cornea now exposed, an excimer laser reshapes the tissue to correct nearsightedness, farsightedness, or astigmatism. Once the laser work is done, the epithelial sheet is smoothed back into its original position, and a bandage contact lens is placed over the eye to protect it while healing.
A variation called epi-LASEK skips the alcohol entirely and instead uses a blunt plastic blade to separate the epithelium from the eye mechanically.
How LASEK Differs From LASIK and PRK
The three procedures all use the same excimer laser to reshape the cornea. The distinction is entirely about what happens before the laser fires.
- LASIK creates a thicker flap that includes both the epithelium and a portion of the corneal tissue beneath it. This flap is cut with a microkeratome blade or a femtosecond laser, lifted, and replaced after the reshaping. Because it cuts deeper into the cornea, LASIK requires more corneal thickness to be performed safely.
- PRK removes the epithelium completely and discards it. The laser reshapes the exposed cornea, and the epithelium regenerates on its own over the following days.
- LASEK preserves the epithelium as a living flap and repositions it after laser treatment, rather than discarding it like PRK. The idea is that keeping this tissue in place may support faster healing and reduce discomfort compared to leaving the cornea fully exposed.
In practice, LASEK and PRK are both classified as “surface ablation” procedures. They leave the deeper corneal structure untouched, which is their main advantage over LASIK for people with thinner corneas.
Who Is a Good Candidate
LASEK is typically considered when LASIK isn’t a safe option. The most common reason is corneal thickness. After any laser vision procedure, enough corneal tissue must remain intact to maintain the eye’s structural strength. Most surgeons want at least 270 microns of tissue left after the procedure, with 310 microns being ideal. Because LASIK’s deeper flap removes more tissue, people with naturally thin corneas or high prescriptions may not have enough to spare.
LASEK can also be a better fit for people at higher risk of flap-related complications from LASIK. This includes people in contact sports or military roles where a blow to the face could dislodge a LASIK flap, even years after surgery. People with certain corneal conditions, very dry eyes, or prior eye surgeries may also be steered toward surface procedures like LASEK.
Recovery and What to Expect
Recovery from LASEK is slower and more uncomfortable than LASIK, which is the main trade-off. LASIK patients often notice improved vision within hours and return to normal activities in a day or two. LASEK recovery looks more like PRK recovery, with the epithelium needing several days to heal and reattach fully.
You’ll wear a bandage contact lens for the first several days to protect the healing surface. During this time, expect moderate discomfort: stinging, tearing, light sensitivity, and a gritty sensation are all normal. Pain levels during the first few days tend to be comparable to PRK, with one study reporting average pain scores around 4 out of 10 for LASEK patients during early recovery. Vision will be blurry initially and clears gradually over several weeks as the epithelium stabilizes.
Activity restrictions follow the same general guidelines as PRK. Contact sports and physical fitness testing are typically cleared at about one month. Swimming in pools, lakes, or oceans also requires waiting at least a month due to infection risk from waterborne bacteria contacting the healing cornea. You should avoid submerging your eyes in any water for at least two weeks.
Corneal Haze: The Main Risk
The most notable risk specific to surface ablation procedures like LASEK is corneal haze, a mild cloudiness that develops in the healing cornea. This happens because the corneal surface generates new tissue as it repairs itself, and that tissue can scatter light slightly.
Haze is common in the months following LASEK. In one clinical study, about 35% of patients had trace-level haze at one month. By three months, 62% showed trace haze and 31% had mild haze. At six months, 58% still had trace haze and 25% had mild haze, with about 8% showing moderate haze. For most patients, this haze is subtle enough that it doesn’t noticeably affect vision. In more significant cases, surgeons may use anti-inflammatory eye drops or a medication called mitomycin C during the procedure itself to prevent haze from developing.
Other risks overlap with those of any refractive surgery: dry eyes in the weeks or months afterward, glare or halos around lights at night, and the possibility of under-correction or over-correction requiring a follow-up procedure. Dry eye tends to be less of a long-term problem with LASEK than with LASIK, because the deeper corneal nerves that regulate tear production are not cut during surface procedures.
Visual Results Compared to LASIK
The final visual outcome from LASEK is generally equivalent to LASIK. Both procedures use the same laser technology to reshape the cornea, so the precision of the correction is the same. The difference is purely in the path to getting there. LASIK delivers fast results with minimal downtime. LASEK takes longer to reach stable vision, often four to six weeks for clarity to fully settle, but arrives at the same destination.
For people with adequate corneal thickness and no other contraindications, LASIK remains the more popular choice simply because of convenience. LASEK fills an important role for those who need the same corrective results but can’t safely undergo the deeper flap creation that LASIK requires. If your eye doctor has recommended LASEK, it usually means they’ve determined it’s the safest path to correcting your vision given your corneal anatomy.