Custom Wavefront PRK (or photorefractive keratectomy) is where no flap of the cornea is created to do the actual correction. The correction is done on the front surface of the cornea. This is the choice procedure if you have a corneal thickness not suitable to do the LASIK procedure. If you are into contact sports like Boxing PRK is preferable to LASIK even if your cornea is thick enough to have LASIK.
This instrument gives personal correction by integrating the wavefront diagnosis obtained with the WASCA Analyzer into therapy with the MEL-80. However, it can do much more besides. If treatment planning is to be truly customized, it must take into account not only wavefront data, but all the relevant parameters of each individual patient.
On the basis of the highly accurate wavefront data from the WASCA Analyzer, the CRS-Master II allows the treatment planning required for the correction. Your correction profile including the higher order aberrations is analyzed in 0.4 seconds!
Customized aberration correction demands the utmost precision from the excimer laser. To guarantee the degree of accuracy required, the CRS-Master II adapts the laser energy to each patient's corneal curvature. Together with the aberration Smart Lens Design of the MEL-80, the extremely accurate ablation creates an optimum basis for the correction of even the smallest irregular refractive errors.
In the development of the CRS-Master II, prime importance was attached not only to the optimization of therapy, but also to safety. During all phases of treatment planning, the residual corneal thickness is monitored.
In the treatment planning process, all relevant parameters are displayed on a clearly structured interface. To permit fast, convenient treatment planning in everyday clinical use, the CRS-Master II offers practical, meaningful presets.
The CRS-Master II is truly customized therapy meeting the needs of your personalized correction with precision.
Not all wavefront analyzers used for different lasers are the same although they use the same Shack-Hartman wavefront analysis method, which is the gold standard for true wavefront analysis. The number of points analyzed varies for different lasers. The more points analyzed the more precise is the creation of the correction profile. Zyoptix treatment by Bausch & Lomb uses the Zywave Aberrometer machine which analyze 78 points on the entire cornea as compared to
WASCA wavefront analyzer analyzing 800 points in a 7MM pupilsary area of the cornea.
You are led to the laser room and you lie down on the laser bed. Your eyes are adjusted so the microscope of the laser can be focused properly' A drop of anesthetic is instilled in the right eye and the left eye is taped shut. A speculum is inserted to keep the right eye open during the procedure. The cornea is covered with a thin layer of epithelium. A rotating fine brush is used for a few seconds to remove this epithelium. Some times 20% alcohol for 20 seconds is used to remove the epithelium.
Now that you've had your personal vision profile using WASCA CRS master and your corneal flap using the XP Microkeratome, your procedure is done using the Zeiss MEL 80 Excimer Laser. The flap created by the microkeratome is lifted to expose the corneal tissue. The laser is delivered to precisely correct your personalized correction. The Zeiss Mel 80 laser has the fastest laser delivery in Manitoba. It also has a very fast Eyetracker to compensate for any eye movement during the procedure.
Because the Zeiss Mel 80 laser is very fast the actual laser correction is done in a matter of seconds. Even the high corrections are done under a maximum of only 45 seconds. After the correction is done a contact lens is placed to protect the treated area during the next 2 to 3 days of healing The left eye is focused under the microscope. The right eye is covered. The process of creating the flap and the laser correction is the same as for the right eye.
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