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Session Title: LASIK
Session Date/Time: Wednesday 09/10/2013 | 08:00-10:30
Paper Time: 08:24
Venue: Auditorium (First Floor)
First Author: : A.Robinet FRANCE
Co Author(s): : D. Smadja D. Touboul
To compare the induced corneal higher-order aberrations (CHOAs) after wavefront-guided (WFG) and wavefront-optimized (WFO) myopic laser in situ keratomileusis (LASIK).
Department of Ophthalmology, University Hospital of Bordeaux, France
This retrospective study comprised 148 refraction-matched myopic eyes that underwent wavefront-guided LASIK with the Visx Star S4 laser (84 eyes) or wavefront-optimized LASIK with the WaveLight Allegretto Wave Eye-Q (64 eyes) targeted for emmetropia. Preoperative and postoperative manifest refraction spherical equivalent (MRSE), uncorrected (UDVA) and corrected (CDVA) distance visual acuities were compared. Total corneal HOA, corneal spherical aberrations, corneal coma through a 6-mm pupil size, and corneal eccentricity were measured with a dual Scheimpflug imaging device preoperatively and 3 months after surgery.
Preoperatively, there were no significant differences between the wavefront-guided and wavefront-optimized groups in age, MRSE, or CHOAs (all p>.05). Postoperatively, there were no differences in UDVA, CDVA and MRSE between the wavefront-guided and wavefront-optimized groups (all P>.05). 100% and 96% of eyes were within +/-0.50 D of emmetropia, respectively after wavefront guided and wavefront optimized ablation, postoperatively. Wavefront-guided ablation induced significantly less total corneal HOAs and less positive corneal spherical aberrations than wavefront-optimized with a mean induction of +0.11 +/- 0.1 ?m and +0.18 +/- 0.18 ?m, and +0.14 +/- 0.16 ?m and +0.27 +/- 0.25 ?m, respectively (p < 0.01). However, there was no difference in induced corneal coma between the 2 groups (p >.05). The increase factor in corneal spherical aberration was 1. 38 and 3.16, respectively with the WFG and WFO treatment.
Although these ablation profiles aim to limit the induction of total eye HOAs, they both induced significant total and spherical corneal aberrations after myopic ablation. However, the wavefront-guided profile induced significantly less total and spherical corneal aberrations than the wavefront optimized profile.
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