A comparative study of mechanical microkeratome vs femtosecond laser in early re-treatment after laser in situ keratomileusis (LASIK)

Session Details

Session Title: LASIK & PRK II

Session Date/Time: Monday 16/09/2019 | 14:00-16:00

Paper Time: 14:42

Venue: Free Paper Forum: Podium 3

First Author: : P.Drake-Rodriguez Casanova SPAIN

Co Author(s): :    I. Rodriguez   S. Rodrigo   P. Cañadas   A. Parafita   J. Gros   M. Teus              

Abstract Details

Purpose:

To compare flap-lift LASIK enhancement outcomes to correct residual refractive errors after three months of primary myopia correction performed with either Moria M2® mechanical microkeratome (Moria SA, Antony, France) or IntraLase® femtosecond laser (Abbott Medical Optics Inc., Santa Ana, California) for flap creation, using the Esiris excimer laser (Schwind Eye Tech Solutions, Kleinostheim) for stromal ablation in both groups.

Setting:

Clinica Novovision, Madrid, Spain.

Methods:

Retrospective Observational Cohort Study of 83 eyes initially treated with IntraLase (Group 1) and 85 eyes initially treated with Moria M2 (Group 2), that underwent enhancement using the “relifting flap” technique. Both groups were matched by the refractive defect. Uncorrected distance visual acuity (UDVA), best corrected distance visual acuity (CDVA) and refractive outcomes were evaluated 1 and 7 days, 1 and 3 months postoperatively.

Results:

No differences in preoperative UDVA and spherical equivalent (SE) were found between groups (p>0.05). At one and seven days postop, Group 2 had statistically better UDVA than Group 1 (p=0.04 and p=0.004, respectively). Nevertheless, at one and three-month visit no differences were found in UDVA between groups (p>0.05). At three-month visit no differences were found in terms of residual refraction (p>0.05) between groups; ten and nine eyes lost ≥ 2 lines of CDVA, 95% and 93%, and 100% and 99% of the eyes had a residual SE within ±0.5D and ±1D, in Groups 1 and 2, respectively.

Conclusions:

LASIK enhancement has been found to be a reliable technique for residual refraction correction after LASIK, providing comparable predictability outcomes with primary LASIK performed to correct low myopia. Nevertheless, we observed an initial faster visual recovery in the mechanical microkeratome group, probably due to a weaker flap adhesion that allows an easier relifting of the flap and less postoperative corneal inflammation than in those eyes treated with the femtosecond laser.

Financial Disclosure:

None