Femtosecond Laser vs Microkeratome in LASIK
Understanding the Two LASIK Flap Methods
During LASIK, we create a thin, hinged flap in the outer layer of your cornea. This flap is gently lifted so that the excimer laser can reshape the corneal tissue underneath and correct your refractive error.
Once the laser treatment is complete, we carefully reposition the flap like a natural bandage. The way we create that flap influences the precision of the procedure, your comfort during surgery, and how quickly your eye heals afterward.
A microkeratome is a mechanical instrument with an oscillating blade that moves across the cornea to create the flap. The device is secured to your eye with a suction ring to hold everything in place while the blade slices a thin layer of corneal tissue.
- The surgeon controls the blade depth using adjustable settings
- The whole process takes only a few seconds per eye
- This technique has been used safely for decades
- The flap edge is smooth and predictable in most cases
The femtosecond laser, often called bladeless LASIK, uses rapid pulses of laser energy to create thousands of tiny bubbles at a precise depth within your cornea. These bubbles form a uniform plane that separates the tissue layers, allowing us to lift the flap without a metal blade.
Because the laser is computer guided, we can program the exact thickness, diameter, and hinge location for your flap. This level of customization helps us tailor the procedure to your unique corneal shape and prescription.
The microkeratome was the standard tool when LASIK was introduced in the 1990s, and millions of successful procedures were performed with this method. As laser technology advanced, the femtosecond laser was approved and quickly became popular because of its ability to create more consistent flap dimensions.
Today, many LASIK centers offer both options, though bladeless LASIK has become the more common choice in practices equipped with the newer technology. Our recommendation depends on your individual eye anatomy and the specific equipment available in our laser suite.
Comparing Safety, Precision, and Outcomes
One of the biggest advantages of the femtosecond laser is the precision with which it creates the flap. Studies show that bladeless LASIK produces flaps within a much narrower range of the intended thickness, often varying by only a few microns.
Microkeratome flaps can be slightly thicker or thinner than planned, though modern devices have greatly improved consistency. For most patients, small variations in flap thickness do not affect the final visual outcome, but in eyes with thinner corneas, every micron matters.
Both flap creation methods carry very low complication rates in experienced hands. With the microkeratome, rare issues can include incomplete flaps, buttonhole flaps, or irregular flap edges, most often related to how the suction ring positions the eye or unexpected patient movement.
- Femtosecond lasers reduce the risk of blade-related irregularities
- Laser flaps may cause transient light sensitivity or small surface bubbles that resolve quickly
- Both methods can occasionally cause inflammation that we manage with eye drops
- Infection risk is extremely low with either technique when proper protocols are followed
The final vision outcomes for bladeless and traditional LASIK are very similar when the surgery is performed correctly. Large reviews of patient data show no significant difference in the percentage of people achieving 20/20 vision or better between the two flap methods.
Recovery speed is also comparable, with most patients noticing clearer vision within hours and returning to normal activities within a day or two. Any minor differences in early healing, such as slightly more initial haziness with laser flaps, typically resolve within the first week.
If your corneas are on the thinner side or you have an irregular surface shape, the femtosecond laser often becomes our preferred choice. Because we can program a thinner, more uniform flap, we preserve more of your underlying corneal tissue for the vision correction itself.
This can be the deciding factor in whether you are a good LASIK candidate at all. Some patients who might not qualify with a microkeratome flap can safely proceed with bladeless technology because we leave more structural support in the cornea.
Determining Which Method Is Right for You
Before recommending a flap creation method, we conduct a comprehensive eye exam that goes far beyond a simple prescription check. We measure your corneal thickness using a device called a pachymeter and map the curvature of your cornea with corneal topography.
- We evaluate the size of your pupil in different lighting conditions
- We check for any signs of keratoconus or corneal ectasia
- We measure your tear film quality to assess dry eye risk
- We review the overall health of your retina and optic nerve
- We calculate the amount of tissue that will be removed based on your prescription
Your corneal thickness is the most important anatomical consideration. If you have thicker corneas and a moderate prescription, both methods may work equally well. Patients with borderline thickness measurements benefit more from the precision of the femtosecond laser.
We also consider the natural curvature and shape of your eye. Steeper corneas or unusually flat corneas may be easier to treat with laser flap creation because we can adjust the suction settings and positioning more precisely than with a mechanical blade.
Certain medical conditions can influence which technique we recommend. If you have a history of keloid scarring or connective tissue disorders, we discuss whether any flap method of LASIK is appropriate or if a surface procedure might be safer.
We also review your medications, including blood thinners that could increase the small risk of bleeding during flap creation. While neither method typically causes significant bleeding, the femtosecond laser may offer an extra margin of safety in these situations.
Bladeless LASIK often costs more than traditional LASIK because the femtosecond laser is a significant investment for the practice. The price difference can range from a few hundred to over a thousand dollars per eye, depending on the region and the specific technology platform.
Most insurance plans consider LASIK an elective cosmetic procedure and do not cover either method. Some flexible spending accounts or health savings accounts can be used to pay for the surgery, and many practices offer financing options to make the procedure more affordable.
What to Expect During Your LASIK Procedure
We will ask you to stop wearing contact lenses for a period before surgery, usually one to two weeks for soft lenses and longer for rigid lenses. This allows your cornea to return to its natural shape so our measurements are accurate.
- Arrange for someone to drive you home after the procedure
- Avoid wearing eye makeup, lotions, or perfumes on surgery day
- Eat a light meal beforehand so you feel comfortable
- Bring sunglasses to protect your eyes from bright light afterward
Once you are in the laser suite, we place numbing drops in your eyes so you will not feel pain. You lie back on a reclining chair, and we position your head under the laser. A small device gently holds your eyelids open so you do not need to worry about blinking.
First, we create the flap using either the microkeratome or the femtosecond laser, depending on the method we planned. Then we lift the flap and ask you to focus on a blinking light while the excimer laser reshapes your cornea. Finally, we reposition the flap and smooth it into place, where it begins to adhere naturally.
With both methods, you will feel gentle pressure on your eye as we apply the suction device to keep everything stable. Your vision may dim or blur temporarily during this step, which is completely normal and lasts only seconds.
If we use the microkeratome, you may hear a brief buzzing sound as the blade moves. With the femtosecond laser, you will hear a rapid clicking or tapping noise from the laser pulses. Neither sound means anything is wrong, and many patients find it reassuring to know what to expect.
Right after LASIK, your eyes may feel gritty, watery, or sensitive to light. We will give you protective shields to wear while you sleep and prescribe eye drops to prevent infection and reduce inflammation. Your vision will be blurry at first, but most patients notice significant improvement within a few hours.
- Rest with your eyes closed for several hours after you get home
- Use your prescribed drops exactly as directed
- Do not rub your eyes for at least a week to avoid dislodging the flap
- Avoid swimming, hot tubs, and eye makeup for the time period we specify
- Wear your eye shields at night to protect against accidental rubbing
We will see you the day after surgery to check that your flap is healing properly and your vision is improving as expected. Additional visits are typically scheduled at one week, one month, and three to six months so we can track your progress.
During these appointments, we measure your vision, check the corneal flap position, look for any signs of inflammation or infection, and assess your tear film. Most healing occurs in the first few weeks, but your vision may continue to stabilize over several months.
Serious complications after LASIK are rare, but you should contact us immediately if you experience sudden vision loss, severe eye pain that does not improve with your prescribed medication, or flashes of light and new floaters. These symptoms could indicate a flap complication or another issue that requires prompt evaluation.
If you accidentally bump or rub your eye hard in the first few days and notice a sudden change in vision or the feeling that something is out of place, call our office right away. Early detection and treatment of flap displacement leads to the best outcomes.
Frequently Asked Questions
Both methods are very safe when performed by an experienced surgeon, and large studies show similarly low complication rates. Bladeless LASIK offers more precise flap thickness control and may reduce certain blade-related risks, but traditional LASIK with a microkeratome has an excellent long-term safety record as well. We choose the method that best fits your individual eye anatomy rather than assuming one is always superior.
The numbing drops we use keep you from feeling pain during flap creation, though you will notice pressure and a sensation of something touching your eye. Most patients describe the experience as uncomfortable rather than painful, and the entire process takes less than a minute per eye. Any discomfort you feel after the numbing wears off is usually mild and improves quickly with rest and lubricating drops.
Flap dislocation is very rare and most often happens in the first day or two if the eye is rubbed or struck. The method used to create the flap does not significantly change this risk as long as the flap heals properly. After the first week, the flap becomes much more stable, and after several months it is unlikely to move unless there is serious trauma to the eye.
Dry eye symptoms are common after LASIK with either flap method because the procedure temporarily disrupts corneal nerves that help regulate tear production. Some research suggests that femtosecond laser flaps may cause slightly less nerve damage because of the more precise cut, but the difference is small and most patients experience similar dry eye symptoms that improve over weeks to months. We may recommend preservative-free artificial tears and other dry eye treatments during your recovery regardless of the technique used.
The eyelid holder prevents you from blinking during the critical moments of flap creation and laser treatment. Modern lasers also have eye tracking systems that follow tiny movements of your eye and adjust the treatment in real time. If you move too much, the laser simply pauses until you are repositioned, so there is no risk of the treatment being applied to the wrong area.
Many surgeons continue to use the microkeratome because it has a proven track record of excellent results and is a perfectly safe option for the majority of LASIK candidates. The equipment cost for a femtosecond laser is substantial, and not all practices have made that investment. Some experienced surgeons are also highly skilled with the microkeratome and prefer the technique they know well, especially for patients with anatomy that is well suited to blade-based flap creation.
Getting Help for Femtosecond Laser vs Microkeratome in LASIK
Choosing between femtosecond laser and microkeratome LASIK is a decision you will make together with our eye doctor based on your unique eyes, lifestyle, and goals. We encourage you to ask questions during your consultation so you understand which approach we recommend and why it is the best fit for you. Our team is here to support you through every step of your vision correction journey.