Techniques
Precise and modern laser technologies in use for a life without glasses or contact lenses.
Laser-assisted crystalline surgery
The femtosecond laser is an infrared laser with a spot diameter of a hundredth of a millimeter, which can make more precise cuts than any microsurgery scalpel. The energy of the laser beam is discharged over an action time of a few hundred femtoseconds (1 femtosecond = 0,000.000.000.000.001s). The tissue can thus be incised with extreme precision and at the same time very gently, while practically no heat is generated. The crystalline capsule can thus better resist ruptures than with conventional techniques and is better adapted to receive a special lens (e.g. for the treatment of presbyopia or astigmatism). The ultrasound energy which may still be required (to remove the crystalline by suction) can also be markedly decreased.
A further technical advantage allowed by this novel instrument is the “optical coherence tomography” (OCT). This is an imaging technique with which high resolution images not only of the cornea, but also of the interior space of the eye with the chambers and the crystalline lens, are made possible.
The measuring principle is similar to the ultrasonic procedure, but with OCT a 40 times superior measurement precision can be attained, because contrary to the ultrasonic technique the measurement is based on light of a single wavelength. Thus even the finest structures of the eye can be represented with micrometer resolution.
Another benefit of this femtosecond laser is the low pressure necessary to gently position the eye by suction, without discomfort. No waves are formed on the corneal surface, allowing a precise incision.
For more details on Femto-Phako please visit: Johnson+Johnson Vision
Femtosecond laser, Zeiss VisuMax
The femtosecond laser is a solid-state laser. It functions in the near infrared range (1053 nm) and can separate tissue layers of a few microns. The energy of the laser beam penetrates through the outermost layer of the cornea to reach a predetermined depth with a precision of a few thousandths of a millimeter. There the energy of the laser creates a layer of minute air bubbles (photodisruption), the tissue is perforated and a fine lamella of cornea can be detached that has the exact thickness and individual shape previously calculated. Outside of the affected domain the tissue remains intact.
The groundbreaking VisuMax laser system from Zeiss uses powerful femtosecond technology with outstanding incision precision, exceptional speed and a gentle treatment approach.
The VisuMax femtosecond laser is specifically designed for therapeutic and refractive applications in modern corneal surgery:
- for precise flap creation in femto lasik
- for a comprehensive spectrum of different corneal transplantation procedures (keratoplasty)
- for intracorneal tunnel segments (ICR tunnel preparation)
- Lenticule extraction with SMILE
For further informations click here: http://www.zeiss.ch
Zeiss MEL 90 Excimer-Laser
The Zeiss MEL 90 was designed specifically for the requirements of modern refractive surgery and combines proven safety with individually configurable options. Unique product features such as the FLEXIQUENCE® switching function (250 Hz / 500 Hz), the new Triple-A ablation profile and an outstanding intraoperative ablation speed of up to 1.3 seconds per diopter open up new treatment perspectives.
The MEL 90 Excimer laser of the company Zeiss is a high frequency Excimer laser of the latest generation. The duration of treatment is shortened markedly in comparison to conventional lasers and there is now warming up of the corneal stroma. The stress on the eye is therefore very low, visual acuity after the treatment is recovered distinctly faster. Ablation with the Zeiss MEL 90 is aspherical, which means that it follows the natural elliptical shape of the cornea. The optical quality achieved with this aspherical ablation is remarkable and increases especially the quality of vision in twilight conditions.
Eye tracker
The Zeiss MEL 90 is guided by an ultra-fast infrared eye tracker. This system ensures that even with a nervous patient or in case of involuntary eye movements ablation is performed only exactly where planned. The precision is of the order of a thousandths of a millimeter.
For further informations click here: http://www.zeiss.ch
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