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Methodology of separation and ablation of corneal tissue using femtosecond and excimer laser

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Session Details

Session Title: Presented Poster Session: Femtolaser Refractive Applications

Session Date/Time: Saturday 05/09/2015 | 09:30-11:00

Paper Time: 10:40

Venue: Poster Village: Pod 2

First Author: : O.Vlasak CZECH REPUBLIC

Co Author(s): :    J. Skorpikova   K. Vodickova           

Abstract Details


The aim of the the poster is to compare and record fate properties of femtosecond and excimer laser on corneal tissue. Which of the methodologies used in contemporary modern refractive surgery is the most accurate and least intrusive?


Neovize Eye Clinic, Vinicni 235, Brno, Czech Republic


The research was conducted on pig eyes. The actual correction of corneal tissue ran on the devices of Zeiss company (femtosecond laser VisuMax: 1100 - 1600nm and excimer laser MEL 80, operating at a wavelength of 193nm). In the operating theater was operated under constant conditions (21 ° C and 45% humidity). Size of flap, transition and optical zone was insignificant for us. The record was taken on electron microscope Tescan VEGA TS 5136XM.


In the ReLEx method electron microscopy images show greater irregularities in both optical and non-optical portion. The situation is better in method using the multiple energy. But the biggest unknown can be seen in the transition region between the non-optical and optical zones The transition zone is clearly visible in the images transition line. From the optical point of view, it may cause undesirable light scattering. Irregularity of the transition line is reduced using the higher separation energy. We therefore conclude that this method is very susceptible to the correct power setting.


For good results with surgery ReLEx method is essential correctly set the laser beam values. However, the quality of corneal stroma bed appears to be still better in older methodologies (when using excimer laser). But this fact is not reflected in the measured high order aberrations, as shown by present study on this topic

Financial Interest:


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