ALLEGRO Topolyzer

The basis for successful treatment of visual disorders is an accurate diagnosis. Working with the ALLEGRO Topolyzer means utilizing an ideal device to support the decision-making process for customized laser eye surgery. By determining the patient’s exact visual correction needs, it greatly enhances the range of possible treatments, from WaveLight's “Wavefront optimized” procedure to the highly sophisticated topography guided treatment.

The ALLEGRO Topolyzer with its corresponding T-CAT software has been specifically designed to measure and generate high resolution treatment data for eyes with severe irregularities. It was developed for the most difficult cases, in which standard Wavefront measurement and treatment would prove clinically ineffective. With an extraordinarily high resolution of the cornea resulting from 22,000 measuring points and a large placido disc, the ALLEGRO Topolyzer is an accurate tool for the preparation of refractive surgery. In addition to producing a refractive map to display the influence of aberrations, the ALLEGRO Topolyzer is fitted with an interactive elevation map, allowing the individual selection of reference body, radius and asphericity.

ALLEGRO T-CAT Treatment

ALLEGRO Topolyzer and T-CAT have been optimized to complete the range of customized laser vision correction and to interact in perfect synchronization with the ALLEGRETTO WAVE excimer laser systems. All necessary treatment and patient parameters are transferred from the ALLEGRO Topolyzer to the ALLEGRETTO WAVE laser systems via diskette, mini CD or memory stick. The ALLEGRO T-CAT software inside the laser′s notebook then calculates the appropriate correction pattern. The surgeon may, however, decide to change individual parameters at any stage of the process. The integrated real keratometer and automatic measuring release allow for precise centration of the image. Digital image transmission and sub-pixel approximation combined with a comfortable working distance and a measuring time amounting to only a fraction of a second allow for the highest possible reproduceability and accuracy of the data recorded. All data obtained here will be used by the ALLEGRO T-CAT software to define the respective treatment parameters.

The ALLEGRO Topolyzer may also be used as a stand-alone diagnostic instrument for regular topography measurements which are always required in refractive surgery. Integrated in the device is a keratoconus detection software and optional pupillometry software is also available. The manifold screen representation possibilities of the ALLEGRO Topolyzer include:
- Overview display
- Large color map
- 3D cornea
- Fourier Analysis
- Zernike Analysis
- Indices (keratoconus detection software)
- Comparative examinations with difference map
- Refractive display mode
- Height data
- Camera image

Applications for the ALLEGRO Topolyzer include:
- Repair station for decentered/irregular ablations after previous refractive surgery
- Enlarging small optical zones
- Keratoconus screening
- Treatment of high astigmatism
- Treatment of other surgically induced corneal irregularities