Side effects of this procedure such as dry eye and foreign body sensation are only minimal since correction is performed through an intact cornea. Opening up of the cornea is no longer necessary in contrast to LASIK or Femto-LASIK. This method does not lead to “incorrectly cut” flaps.
Femtosecond lenticule extraction: the treatment process
Prerequisites for femtosecond lenticule extraction SMILE
Superiority of femtosecond lenticule extraction SMILE over other laser treatments
VisuMax – the precise, latest-generation femtosecond laser
Minimal laser pulse energy, enabled by highly precise Zeiss optics and high pulse frequency achieve a hitherto unsurpassed perfection of tissue separation – and exactly at the desired corneal depth. Creation of the lenticule with the VisuMax is highly predictable. Femtosecond lenticule extraction SMILE may effectively rid even those patients of their spectacles or contact lenses in whom refractive error correction by laser was previously not possible due to a thin cornea or extremely defective vision.
Functioning of the femtosecond laser
The femtosecond laser is a solid-state laser, and functions in the near infrared range (1053 nm). The energy of the laser beam penetrates the outermost corneal layer to a predetermined and exactly calculated depth to the nearest thousandth of a millimetre. The laser’s energy (photodisruption) give rise to extremely fine air bubbles at the surface, the tissue is severed and a lenticular corneal disc of pre-determined depth and individualised shape is obtained. Tissue outside of the site of application remains unchanged.