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Comparison of laser in situ keratomileusis flaps created by 3 Femtosecond lasers

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Session Details

Session Title: Refractive
Session Date/Time: Sunday 28/02/2016 | 08:30-11:00
Paper Time: 09:42
Venue: Skalkotas
First Author: : M.Anticic CROATIA
Co Author(s): :    M. Bohac   M. Koncarevic   A. Biscevic   N. Gabric     

Abstract Details


To evaluate the thickness of laser in situ keratomileusis (LASIK) flaps created by 1 of 3 femtosecond lasers using anterior optical coherence tomography (OCT -Carl Zeiss Meditec AG, Jena Germany) in patients with myopia and myopic astigmatism.


Specialty Eye Hospital “Svjetlost”, School of Medicine, University of Rijeka, Zagreb, Croatia


In this comparative case series, flap creation for bilateral LASIK was performed using an IntraLase (femtosecond group 1), Femto LDV (femtosecond group 2) and VisuMax (femtosecond group 3). We evaluated central flap thickness, mean flap thickness, meridian flap uniformity, difference between the mean central and mid-peripheral flap thickness 2 mm in the horisontal and vertical plane and flap thickness predictability (mean deviation between the achieved and attempted flap thickness). Flap thickness was determined at 10 points. Intented flap thickness was 110 μm. Measurements were taken 3 months postoperatively.


All femtosecond groups comprised 82 eyes. Eyes in femtosecond groups 1 and 3 had relatively even flap configuration. Flaps in femtosecond group 2 had a meniscus shape with the difference between the mean peripheral 108,27±4,6µm and the central flap thickness 94,04±3,20µm (P<.001). Flaps in femtosecond group 3 had the least difference between the mean peripheral 108,12±17µm and the central flap thickness 105±15,5µm (P<0.68). Meridian flap uniformity measured at 10 measurement points at 90- and 180- degrees were uniform and regular for each femtosecond device. The flap thickness predictability was similar in all femtosecond groups (P=0.312).


Flap morphology differed according to the system used. Although the central flap thickness created by the Ziemer LDV was less than that created by the Intralase and VisuMax, measurements of 3 femtosecond lasers were close to the intended thickness.

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