The cornea is the first lens of the different ones that composes our visual system, is the previous zone and is transparent of the outer membrane that covers the ocular globe. It is transparent because their fibers are parallel. As far as his functions, besides allowing to the refraction and transmission of the light it acts like biological lens that along with the crystalline focuses the images that the retina perceives. He is responsible for around a 80% of the focusing capacity and on his major or minor curvature it depends that the refracting defects in the eye take place most of. In addition the cornea has a specific thickness del that partly depends its functionality.

The average of this thickness is of 550 microns for the majority of the people, of who 150 microns can only be eliminated by means of refracting surgery. This data is from great relevance because not amount must to eliminate of weave, that causes after the intervention that the corneal thickness is inferior to 400 microns, this would possibly induce consequences nonwished and serious visual complications in the long term (ectasias corneous to them).

For that reason the advance obtained with the technology Intratase FS is so important when allowing a more precise cut, finer and more regular of the corneal lamina, these advantages allow to be found to great amount of patients with reduced thicknesses corneous to them that before they could not be found.

The refracting surgery by means of Excimer Laser (Lasik) is realised in its totality on the cornea, the procedure basically consists of carving with a laser beam a lens equivalent to the refracting defect that affects the patient.

The surgery realised with Intralase as we explained previously realises the corneal flap by means of another laser of femtosecond, therefore in the refracting surgery that is realised with Intralase two types different from Laser take part.

A beam of pulses of laser of very short duration generates a plasma, this plasma expands at a high speed and moves the weave of around. The expanded plasma continues through weave like a wave front. When the wave front loses energy and speed, the acoustic waves disappear and the plasma cools off, taking the form from a bubble. The point in which it cools off is the depth to that we want to create the flap, is the point in which the laser was focused.