FemtoLasik: the technique that achieves anomaly-free vision

The LASIK technique is used worldwide in Ophthalmology to correct mild or moderate refractive defects, since the severe ones go better with ICL. In recent years, the use of Femtosecond laser has been incorporated to this technique, giving rise to the so-called FEMTOLASIK.

During the procedure of this technique two types of laser are used: the Femtosecond, which has given the name to FEMTOLASIK, and the Excimer, which is in charge of controlling and correcting the patient’s refractive error.

The combination of the Femtosecond laser and the Excimer makes it possible to safely operate myopia, even up to 6 and 7 diopters. This technique also allows treating hyperopia up to 4.5 – 5.5 diopters and astigmatism up to almost 6. Regarding the minimum necessary to be able to undergo surgery, refractive defects of 0.50 diopters or more, both myopia, hyperopia and astigmatism, can generally be operated on.

Uses of FemtoLasik

The first step performed in the operating room is the lifting of the corneal flap. FemtoLasik makes it possible to avoid the use of a scalpel in this process, since the femtosecond laser achieves a very regular, centered incision of homogeneous thickness.

In the second stage of the procedure, the Excimer laser is applied to correct the patient’s refractive error. Prior to this, the patient’s refractive parameters are entered into a computer, as well as the energy emitted by the laser on the eye and the application time.

In addition, the Excimer laser includes the ‘Eye Tracking’ system that allows the laser to follow the eye movements during the procedure so that the treatment is centered with respect to the pupil, thus avoiding problems if the eye moves. When the second laser is applied, the flap is returned to its natural position, where it heals without the need for stitches.

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FemtoLasik: postoperative period

More than 95% of the patients who undergo surgery become emmetropic, that is to say, they achieve vision without anomalies. If any refractive defect remains, it may be operable within six months.

Post-surgical recovery is fast and the patient can notice an improvement from the moment he/she leaves the operating room. The evaluation of the results is made in a review the day after surgery.

During the first 10-12 hours it is recommended that the patient apply drops every hour. In addition, experts advise not to perform any work activities during the following 4 days.


  • The patient cannot be operated if he/she has a very thin cornea in reference to the diopters to be removed.
  • The specialist should also examine the corneal curvature to verify that it is adequate.
  • Femtolaisk is contraindicated in patients with severe dry eyes, as the procedure could worsen it.
  • The treatment is contraindicated for pregnant women, because it is an unstable period in the lack of vision.