Comparison of visual and refractive results and flap morphology when using two different femtosecond laser platforms for the correction of myopia: IntraLase® vs Victus®

Session Details

Session Title: LASIK: Flap Morphology and Ablation Profile

Session Date/Time: Monday 09/10/2017 | 08:30-10:20

Paper Time: 09:00

Venue: Room 3.6

First Author: : M.Garcia-Gonzalez SPAIN

Co Author(s): :    C. Bouza-Miguenz   A. Parafita-Fernandez   G. Laucirika   R. Aranda-Benito   C. Villa   M. Teus     

Abstract Details

Purpose:

To compare the 3-month postoperative visual and refractive results and flap thickness homogeneity (FTH) when using two different femtosecond (FS) laser platforms to correct myopia: IntraLase® versus Victus®.

Setting:

Clínica Novovisión, Madrid, Spain; Clínica Rementería, Madrid, Spain; Universidad Europea de Madrid, Spain; Universidad de Alcalá, Alcalá de Henares, Madrid, Spain

Methods:

Prospective, observational study. 47 myopic eyes that underwent FS-LASIK (31 eyes using Intralase® vs 16 eyes using Victus®) aiming for 110 µm flap thickness (FT), and using the same Allegretto® excimer laser, were included. Visual and refractive results and the change in higher order aberrations were evaluated at 3 months postop. In addition, FT was measured at the center and at 14 points along the horizontal axis, in each case, using an anterior segment OCT (Spectralis®). In order to evaluate FTH, we calculated the difference between the maximum and the minimum thickness point of each flap.

Results:

At 3 months postop, uncorrected distance visual acuity, residual refraction, efficacy, safety and predictability were significantly better in the IntraLase group. The Victus® group showed a significant greater increase in total corneal room mean square (RMS) (P=0.007), coma (P=0.04) and spherical aberration (P=0.0001) compared to IntraLase®. Mean central FT was 123.2 ± 9.2 µm in the IntraLase® group and 116.3 ± 14.4 µm in the Victus® group (P=0.005). The difference between the maximum and the minimum FT points in each flap was significantly lower with IntraLase (22 ± 8.3 µm) than with Victus (35.7 ± 16.9 µm) (P=0.0007).

Conclusions:

Our preliminary results suggest that IntraLase® offers higher degrees of efficacy, safety, predictability and FTH than Victus® for the correction of myopia. Although FS flaps are believed to be planar and highly reproducible in thickness, this may not be the case for every FS-device. Differences in the patient interface shape (flat or curved) and/or the level of the IOP at which each laser device might influence in FTH. Moreover, it is presumably that the better FTH obtained with IntraLase® would explain the significantly better visual and refractive outcomes obtained with this FS laser compared to Victus®

Financial Disclosure:

receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented, research is funded, fully or partially, by a competing company, research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented, receives consulting fees, retainer, or contract payments from a competing company