iLasik and Technology
The “i” in iLASIK stands for “individual”! Since this will be adjusted to the individual patient.
With iLASIK it is possible for the first time to tailor all the steps of the operation individually to suit the patient. The ability to adapt to individual specific features allows an individual correction of the defective vision and leads to an optimized result: Individual Best Vision.
The technology which is used in the iLasik Method is tested and completely trustworthy. Today even NASA and the US army send their astronauts or pilots for an iLASIK treatment. The iLASIK method gives the best results even on people who have to possess a very strong and exceptional visual talent, such as astronauts and pilots, who are exposed to extraordinary natural conditions. This can be achieved by the iLASIK treatment.
Your Treatment Process:
- Step :
Using Wavefront-3D measurement analysis the “genetic fingerprint” of the eye is individually determined and taken into account during the treatment of the cornea.
- Step :
The iLASIK treatment uses the latest technology. It is performed on the Cornea; the flap is produced without cutting. ILASIK guarantees an excellent result. The laser surgery using IntraLase accelerates improvement after surgery. The contactless Femtosecond laser allows the preparation of individually designed optimal corneal flaps with faster wound healing.
- Step :
Your Tailor-made laser eye treatment: After the wave scan technology, your personal profile is created using the further innovative technology without cutting your corneal flap. Now your vision will be improved within the scope of the iLASIK treatment with the Advanced CustomVue technology. Everything is consistent with the principle of personal visual quality combined. The Eximer laser system ensures the individual treatment by coupling with the wave front analysis, fully automatic iris recognition as well as variable spot scanning and variable laser pulse rate
iLASIK is also called Femto-Wavefront-LASIK!
This refers to the combination of wavefront-controlled LASIK and Femto-LASIK.
- Wavefront analysis (Aberrometry)
- Corneal incision with Femtosecond laser
- Correction based on wavefront
During the wavefront analysis, the refractive power of the eye at over 200 different points is measured. The data provides an individual “fingerprint” of the eye. The dimensions of the corneal section such as diameter and hinge position are determined by the individual surgeon. The corneal ablation is based on the wavefront analysis: At each point of the cornea, the refractive power specifically is corrected.
The function of the Aberrometer
The Aberrometer is a device which is used in the so-called Wavefront analysis. It is used for the exact determination of the objective and quantitative aberration of the human eye.
The Aberrometer works in the following way: first light is sent into the eye and collected precisely on the retina. The wave front measures the light reflected at over 200 points in the eye using tiny optical sensors. The run-time error of light is recorded and entered on a so-called wave front map. If the eye is without any defects then the light will be reflected in the same way as with Wavefront. When there is a defect, however, the light reflected produces an irregular wave front. These irregularities can be due to refractive power error such as with a sphere and cylindrical shape and also other effects interfering with the picture quality, known as higher-order aberrations.
The wave front map corresponds to a graphic representation of all the image defects of the optical system and is therefore often called the “fingerprint” of the eye.
The WaveScan Wavefront System
The Wavefront System uses the Hartmann Shack Aberrometer which records 240 different measuring values and 100% of them with the unique VISX Fourier Algorhythmus. It, therefore, guarantees an exact result. The WaveScan wavefront system supports the iris recognition and is connected with the laser VISX Excimer system for an optimized wavefront-guided treatment.
Cornea cut with Femtosecond laser:
What is a Femtosecond laser?
The Femtosecond laser is an Infrared-Laser, which works with a wavelength of 1052 nm. It works with a small spot size of 1/100 mm and it has a very short active duration of a few hundred femtoseconds (1 Femtosecond = 10-15 s = 0,000.000.000.000.001 s). The application of Femtosecond lasers in the field of Ophthalmology is for the blunt separation of corneal tissue.
The iLasik or Femto LASIK is computer-controlled. The contactless femtosecond laser has replaced the hand-held mechanical Microkeratom, which was traditionally used in the first step of LASIK to cut the cornea. In addition, the femtosecond laser is among others used to correct high corneal curvatures (astigmatism Keratotomy), by the implantation of intracorneal ring segments and by a corneal transplant. The femtosecond laser guarantees stable corneal flaps with improved wound healing and a higher bio-mechanical stability. Since hardly any aberrations are induced by the laser cutting, the Femto LASIK delivers better results. By avoiding editing-related complications it increases the security of the operation.
Wavefront Eximerlaser-Correction (VIS STAR S4 IR Eximer-Laser):
The Eximer laser system ensures the individual treatment by coupling with the wave front analysis, fully automatic iris recognition as well as variable spot scanning and variable laser pulse rate. The Excimer laser, developed at the end of the 1970s, produces radiation in the ultraviolet wavelength range. The light pulses occur in a high pressure gas mixture that is transferred at a high-voltage discharge of 25,000 volts in an energetically excited state. The laser pulses are formed by special computer-controlled optics and are distributed over the cornea, so that the desired modeling is achieved with the elimination of shortsightedness and long sightedness, corneal curvature and also eyes with higher-order (aberrations).
VISX STAR S4 IR© Excimer Laser-Advantages:
The fully automatic VISX Iris recognition
The pattern of the iris or eye is – like a finger print – an individual characteristic. A picture of the iris is taken in the framework of the preliminary study whilst the patient is sitting, and then the eye can be aligned later when the patient is lying down: With iris recognition it is possible, that with the Wavefront Analysis data can be correctly projected onto the cornea of the patients. The iris recognition therefore provides a basis for the correct adjustment of the treatment.
Variable Spot Scanning, Variable Repetition Rate
While the first Excimer laser sent out a laser beam with large diameters, more modern devices use a very small beam diameter, which moves at a high frequency over the cornea (“flying spot”). Using a feedback mechanism, it is registered, where the laser has already removed corneal tissue. By selective removal, a more accurate and a more sparing treatment on the cornea is possible, since the same point is never treated twice.
The VISX STAR S4 IR Excimer laser has a variable Laser beam, i.e. the diameter can vary from 0.65 mm to 6.5 mm. In addition, the laser pulse rate can be adjusted from 6 to 20 Hz. Overall, the same result can be achieved with less corneal ablation. This is especially advantageous for patients with a thinner cornea.
Active Track 3-D Eye Tracking System
Eye trackers are an important part of modern laser systems. Eye tracker detects even minimal and involuntary eye movements and quickly equalizes them: sensitive sensors and cameras observe the position of the pupil with approx. 120-240 measurements per second. When the eye – or the head of the patient – is moved during the laser treatment, a signal is sent to the laser eye tracker and reports the changed position. The laser adjusts its ablation profile to the new position and follows the eye movement; therefore it is called The Eye Tracking System.
Simple Eye trackers are only able to capture horizontal and vertical movements (in the x and y axis). New technologies – such as the VISX STAR S4 IR Excimer laser Iris recognition – enable it, in addition to take into account rotatory (circular) eye movements in the z axis.