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Impressum
Topography-assisted individual photoablation
Bende T., Berret R., Oltrup T., Jean B., Magnago T.
Universitäts-Augenklinik, Eberhard-Karls-Universität, Tübingen
Purpose: Individual photoablation as a method to optimize the
outcome of refractive surgery and as "repair kit" for irregular
corneal surface (e.g. decentration after PRK/LASIK) will be demonstrated.
Methods: Results of the high resolution topography (C-Scan) based
surgery planer (ORK; SCHWIND Eye-Tech Solutions) in combination with the
lasers SCHWIND ESIRIS and SCHWIND MULTISCAN will be presented. These results
will be compared with results after standard treatment. The influence
of relevant parameters like treatment zone diameter, bending-zone, corneal
thickness (total, thickness, flap thickness, remaining stromal thickness)
on the treatment and the resulting outcome with regard to Selective Corneal
Aberration (SCOA), Functional Optical Zone (FOZ), Modular Transfer Funktion
(MTF), Phaseshift and Point-Spread-Function (PSF) will be evaluated.
Results: Results of topography assissted individual photoablation
will be presented. Principles, possibilities and limitations will be discussed
for these examples. With LASIK, for instance, there is less corneal stroma
available for the recentration of a decentered photoablation as with PRK,
which causes the neccessity for different treatments.
Conclusion: The surgery planer presented here allows treatment
of irregular corneal surfaces, being not accessible with standard treatment
as such as an optimized ablation of regular corneas.