Femtosecond laser Optimedica
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: www.optimedica.com
Femtosecond laser, Zeiss Visumax
Laser correction Femto Lasik
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.
Zeiss MEL 80 Excimer-Laser
(Frequency 250 Hz, impulse 4 nanoseconds)
The MEL 80 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 80 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 (eye-tracking system with a frequency of 250 Hz)
The Zeiss MEL 80 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.
Wave front and aberrometry guided Lasik
Aberrations are deviations form the ideal optical image formed in the eye. The wave front and aberrometry guided laser treatment allows to detect the most minute optical defects or the deviations of the global deviations of the eye and results in an even better visual acuity in the twilight and an improved contrast vision. The measurement data obtained with the aberrometer are translated into an ablation profile for the laser, permitting to attain the optimal light refraction for the eye and to effect the corresponding corrections at the cornea.
There are two measurement methods
We organize regular information sessions on the most modern technologies and safest procedures for the correction of visual defects.
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