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Using an excimer laser (phase 2), refractive surgery consists of changing the anterior curve of the cornea (the transparent surface of the eye).
It allows permanent visual correction in patients whose eye presents an optical defect: myopia, hypermetropia, astigmatism, and more recently presbyopia in hypermetropic patients.

The intervention is carried out in two phases. The first phase consists of gaining access to the corneal treatment area (passing through the superficial layers of the cornea). The second stage consists of the laser treatment itself which modifies the corneal curve (making it flatter for myopia and more rounded for hypermetropia).

Different techniques applied before corneal remodelling
There are other methods than laser refractive surgery.

Lasik Femtoseconde

This is the most recent method, known as “all laser”. Femtosecond laser replaces the microkeratome, thus removing any mechanical risk associated with cutting with a blade.

Main advantages:

  • The corneal flap created has parallel sides and is of perfectly consistent thickness 
  • The thickness, size, centring and regularity of the flap are programmable with an accuracy of a few microns
  • The quality and predictability of the results are better than with other techniques
  • Stability is enhanced and postoperative corrections are less frequent

PRK

Ablation of the epithelium is achieved by simple scraping after instillation of anaesthetic drops.

This very simple and very safe technique requires more time for clear vision to be restored, however, as the epithelium needs to re-form.

Main advantages:

  • Suitable for small or medium corrections
  • Suitable for very thin corneas or those otherwise at risk with Lasik
  • Suitable for irregular or asymmetrical corneas
  • Suitable for patients with activities that carry a risk of trauma

Personalised treatments

Modification of the corneal curve is achieved by a series of energy spots (laser pulses) which remodel the corneal tissue: this is what is known as excimer laser treatment. During this treatment, you look at a flashing light during the series of pulses. The laser is optically connected to your iris (the Eye-tracker system). This system has two advantages: the first is the precision of the treatment, and the second is ensured safety in case of eye movement. The whole intervention is completely painless.

Treatment options can be proposed that go further than the simple correction of vision; Advanced Personalised Treatment (APT) increases image quality, and SupraCor® treatment allows hypermetropic patients to also treat their presbyopia.

Certain optical mini-defects, called aberrations (independent of refractive error) reduce image quality or, in some people, cause poorer vision at night. These aberrations are more frequent in people with large pupils.
Control of the laser with appropriate software allows correction of these mini-defects and therefore sight can be improved beyond simple correction of refractive error.

Main advantages:

  • Improvement of vision at night as well as during the day
  • Reduction of the amount of tissue removed

SUPRACOR ®

SupraCor is the very latest technology in the treatment of presbyopia. It is used during Femtosecond Lasik treatment.