Abstract

SA.27.11

Aspheric ablations with the Bausch & Lomb 217 Z 100 laser

Taneri S., Stottmeister S.
Zentrum für Refraktive Chirurgie und Augenabteilung am St. Franziskus-Hospital Münster

Objective: To evaluate the clinical performance of the new aspheric ablation mode (Zyoptix Aspheric) in laser in situ keratomileusis (LASIK) using the Bausch & Lomb 217 Zyoptix 100 laser. This new algorithm incorporates the asphericity of the cornea (Q-value), the corneal curvature (K-values) and the manifest refractive error to create an ablation pattern.
Methods: Clinical Study with 3 groups of treatments: Group I: 20 eyes treated with the Zyoptix Tissue-saving profile (refraction and keratometry based) Group II: 50 eyes treated with the Zyoptix Aspheric profil Group III: 20 eyes treated with the Zyoptix Personalized Treatment (wavefront aberration-guided) Eligible eyes were between 0 D and -8.0 D of sphere did not have more than -1.5 D of refractive astigmatism (not corneal or wavefront-predicted). The Zyoptix XP microkeratome was used to create the LASIK flap. Follow-up visits were scheduled at day 1, day 5-8, 1 month, and 3 months. Mean outcome measures: High and low contrast visual acuity, predictability of the spherical and cylindrical correction, induced changes in wavefront aberration.
Results: In group 2 the average refraction was spherical -0.14 dpt and -0,33 dpt cylindrical. The spherical aberration (Z400) remained constant at 0.015 µm. The uncorrected contrast sensitivity without glare was identical to preoperative best corrected. The contrast sensitivity with glare was slightly better than preoperatively. Natural asphericity of the cornea was best preserved in group 2. The efficacy index was 1.03 (better than in group 1 and 3).
Conclusions: Results with aspheric ablations indicate a very good predictability in terms of refraction and uncorrected contrast sensitivity at preoperatively best corrected levels

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