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Comparison of induced corneal higher-order aberrations after wavefront-guided and wavefront-optimized myopic laser in situ keratomileusis

Session Details

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           

Abstract Details

Purpose:

To compare the induced corneal higher-order aberrations (CHOAs) after wavefront-guided (WFG) and wavefront-optimized (WFO) myopic laser in situ keratomileusis (LASIK).

Setting:

Department of Ophthalmology, University Hospital of Bordeaux, France

Methods:

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.

Results:

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.

Conclusions:

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.

Financial Interest:

NONE