Femto-LASIK is the development of the classic LASIK, and is the most accurate and safest method for correcting refractive errors.

Why Femto-LASIK Instead of LASIK?

LASIK (laser in situ keratomileusis) is a scientifically well-documented and well-established treatment form for refractive errors, and is the preferred treatment method of most eye specialists. This classic LASIK method has been developed significantly in recent years: into Femto LASIK. In order to correct a vision disorder with a laser treatment, it is necessary first to prepare a small round corneal flap. In the classic LASIK procedure, this corneal lamella is prepared with a microkeratome (a precision surgical instrument with an oscillating blade). In the Femto LASIK procedure, however, the femtosecond laser prepares the flap–without any use of mechanical blades.


Highest Level of Safety and Precision is Achieved with the Femtosecond Laser

The Femto LASIK is technologically the most precise procedure for preparing the corneal lamella. For this reason, you should always make sure that the clinic you choose use a femtosecond laser in their laser eye treatments.

The Procedure


Femtosecond Laser:

First, the thin corneal lamella (flap) is prepared with the femtosecond laser–tissue conserving, evenly and safely




Excimer Laser:

The flap is then carefully folded to the side. Now the Excimer Laser carefully ablates one thousandth of a millimeter (micrometer µm). Through this shaping of the cornea, the refractive error is corrected.



After the use of the excimer laser, the flap is carefully folded back. The flap is quickly fixed and stays in place because of the natural vacuum of the eye and protects the surface of the eye like a natural bandage.


Femto-LASIK Video

The Classic LASIK Procedure

The Advantages

The Femto-LASIK Treatment with the Femtosecond Laser Offers Significant Advantages for the Patient:

  • Treatment of higher refrective errors
  • Treatment by thin corneas
  • Minimizing cut-related complications
  • Safer and more precise
  • Overall gentler to the eye
  • Faster vision recovery


The Advantages of the Femtosecond Laser in Detail:

  • The femtosecond laser is able to produce a much more reliable, gentle and precise corneal flap than the microkeratome. A femtosecond laser can create a flap within 10μm of the desired thickness, whereas the traditional keratome is only accurate within 20-40μm.
  • The laser creates an smooth and uniformly shaped corneal lamella. The center of the flap is exactly the same thickness as in the periphery. Cut-related complications are thereby reduced to an absolute minimum–they are actually nonexistent.
  • The high precision in the thickness of the flap is impossible with a micro keratome. Corneal flaps that are made with the micro keratome are thinner in the center. This can cause a postponement of the following treatment to a later date.
  • The Femtosecond laser works fast and painfree. When the corneal lamella is being prepared you will see a bright light. The so-called "blackout", which usually occurs with the microkeratome, is virtually impossible.
  • The molded glass lens used to fixate the eye is much more pleasant than the previously used suction ring and also much less stressful for the cornea.
  • Due to the gentle and absolutely blade free treatment of the the cornea a significantly faster vision rehabilitation is possible. The cornea remains free of damage, because the tiny bubbles, induced by the femtosecond laser, will be absorbed by the cornea. The tissue heals very rapidly after the treatment. Temporary side effects, such as dry eyes, are rare.

Treatment Procedure

1. Personal, Non-binding Consultation:

  • All relevant eye parameters are measured.
  • We determine what the best method of treatment is for your eyes
  • Examine your eyes to make sure you are a suitable candidate for the treatment



2. A Thorough Medical Preliminary Examination

  • The examination usually lasts about two hour
  • Intensive ophthalmic preliminary examination and measurement of your eyes
  • Our Specialists in ophthalmology will explain every detail about the treatment
  • Before this preliminary examination you must not have worn soft contact lenses for one week and hard contact lenses for two weeks
  • Please note that after the examination you will not be safe driving a vehicle–neither car, nor motorcycle or bicycle. We therefore recommend that you take a cab or public transportation
  • At the examination you will receive a after-care set for the days after your treatment. The medication and content will be explained in detail by our staff


3. On the Day of the Treatment

  • We recommend that you wear comfortable clothes on the day of treatment
  • You can eat and drink normally on the treatment day, but please do not smoke
  • For hygiene reasons, it is also important that you wash your face thoroughly prior to treatment, completely remove makeup, and avoid perfume
  • Outpatient surgery, anesthetic eye drops, no bandage, and sunglasses are recommended
  • The total duration of the laser eye treatment for both eyes: approximately 25 minutes
  • You are not allowed to drive a vehicle after the procedure


4. After the Treatment

  • Please do not rub your eyes!
  • Antibiotic eye drops 5 x á day for 1 week
  • Artificial tears as required
  • Return to work after 2-3 days
  • Resume sports activities after approximately 3 days, swimming and sauna after approximately 2 weeks
  • Post-operative follow-up examinations: after 1 day – 1 week – 1 month
  • You may drive a vehicle again only with the doctor's permission, normally after the 1 week post-operative examination


Good to know

Technical Info About the Femtosecond Laser

The femtosecond laser is an infrared laser that can treat tissue very precisely with significantly less heat created than other laser treatments - a big advantage in laser eye surgery. Femtosecond lasers work with ultra-short light impulses that need only a billionth of a second to create a spot as tiny as 1/100mm. To illustrate the extremely short pulse time: In one second, light travels 7.5 times around the earth, however, in one femtosecond, it only travels one half of the thickness of a hair!


The Preparation of the Corneal Lamella with the Femtosecond Laser–in Detail:

Contrary to traditional lasers, the energy of the laser beam from a femtosecond laser does not affect the tissue on the corneal surface, but reaches a specific predetermined depth inside the cornea. Very high energy levels can thereby be achieved through intense focusing of the laser beam. The point of focus of the laser beam allows material to be divided at the molecular level (photo-disruption), gently separating the tissue. The surrounding corneal tissue remains undisturbed without damage. The femtosecond laser scans the cornea starting at one edge and works its way towards the other side (Ill. 3a). The laser beam produces a layer of tiny bubbles in exactly the desired location depth of the cornea. This enables the corneal flap to be opened and lifted to the side like in traditional LASIK. The final treatment with the excimer laser is then identical to traditional LASIK.


Schematic Representation:

The Laser energy is focused at a precisely predetermined depth of the corneal tissue.





A micro bubble consisting of gas and water is generated (diameter: 5 - 12 μm). The bubble expands and separates the surrounding corneal layers.




The photo-disruption results in a mixture of carbon dioxide (CO2) and water. The epithelial pumping action makes sure the latter is absorbed. What remains, is the separated corneal tissue.



In summary, thousands of laser impulses separate the corneal lamella in the entire flap area. Thus, the Femtosecond laser has made an incision without ever touching the cornea, and because of this is also called a laser keratome. Subsequently, the flap can easily be flipped over by a blunt spatula. 

Advantages of the Femto-LASIK Compared to Classic LASIK at a Glance


Flap Preparation with Femto Laser Flap Preparation with Microkeratome
  • smooth, even corneal flaps
  • thinner flaps, less tissue ablation
  • safer and more precise method
  • painfree method, "gentle Lasik"
  • more gentle method
  • faster vision rehabilitation
  • shaped lens glas
  • no cut-related complications
  • no black-outs during the treatment
  • no blocking of the retina's blood circulation
  • unevenly shaped corneal flap
  • more strain on the cornea due to a thicker flap
  • unreliable method, deviations in the thickness of the flap
  • unpleasant to painful
  • increased strain in the eye due to the microblade
  • longer side effects such as dry eyes
  • suction ring
  • cut-related complication are possible
  • black-out of the eye
  • blocking of the retina's blood circulation is possible

Frequently Asked Questions about LASIK / Femto LASIK