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Significant topographic thickness variability differences in LASIK flaps created by a mechanical microkeratome versus two different femtosecond lasers

Session Details

Session Title: LASIK

Session Date/Time: Wednesday 09/10/2013 | 08:00-10:30

Paper Time: 09:00

Venue: Auditorium (First Floor)

First Author: : M.Chalikia GREECE

Co Author(s): :    A. Kanellopoulos   G. Asimellis           

Abstract Details

Purpose:

To evaluate topographic thickness variability with possible epithelial remodeling interference on LASIK flaps created with 3 different techniques.

Setting:

Laservision.gr Eye Institute, Athens, Greece

Methods:

55 patients that had bilateral (110 eyes) myopic LASIK several years ago (2-7 years; average 4.5 ± 2.7 years), formed three groups, based on the method of flap creation: group A (flap created by the Moria M-2 microkeratome), group B (the AMO Intralase™ FS60 femtosecond laser), and group C (the Alcon – WaveLight® FS200 femtosecond laser). All cases were completed with the Alcon/ WaveLight Allegretto Wave® Eye-Q 400Hz excimer laser. Topographic thickness maps of each LASIK flap were obtained by means of scanning high frequency ultrasound biomicroscopy imaging.

Results:

The average central flap thickness for each group was: Group A: 138.33 ± 12.38 ?m, group B: 128.46 ± 5.72 ?m and group C: 122.00 ± 5.64 ?m. When multiple paracentral and peripheral flap thickness points were evaluated, variability for the flap thickness was 9.73 ± 4.93 for group A, 8.48 ± 4.23 ?m for group B, and 4.84 ± 1.88 ?m for group C. The overall thickness homogeneity of group C (FS200) was statistically significant when compared to group A: M2 (p = 0.004), and group B: FS60 (p = 0.078).

Conclusions:

This study suggests that there may be a significant difference in flap thickness homogeneity between the two femtosecond lasers and the microkeratome studied. The FS200 appears significantly superior to both the FS60 and M2 in flap thickness homogeneity.

Financial Interest:

... travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented