Table of Contents
Advances in Optical Technologies
Volume 2010, Article ID 538541, 13 pages
http://dx.doi.org/10.1155/2010/538541
Research Article

Ablation Resolution in Laser Corneal Refractive Surgery: The Dual Fluence Concept of the AMARIS Platform

1Research and Development Department, SCHWIND Eye-Tech-Solutions, 63801 Kleinostheim, Germany
2Grupo de Investigación de Cirugía Refractiva y Calidad de Visión, Instituto de Oftalmobiología Aplicada, University of Valladolid, 47011 Valladolid, Spain

Received 15 February 2010; Revised 21 June 2010; Accepted 8 July 2010

Academic Editor: Maria Calvo

Copyright © 2010 Samuel Arba-Mosquera and Thomas Hollerbach. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose. To evaluate to which extent individual Zernike terms can be corrected. Methods. Ablation time and fidelity was analysed using different fluence levels (range 90–2000 mJ/ c m 2 ) and aspheric ablation profiles. With optimal parameters, the extent to which individual Zernike modes can be corrected was evaluated. Results. The range 188–565 mJ/ c m 2 resulted as optimum fluence level with an optimum proportion range 50%–90% for high fluence. With optimal parameters, it corresponds to 2.4 s/D at 6 mm OZ, with fidelity variance of 53  𝜇 m RMS, and average ablation error of 0.5  𝜇 m for each location. Ablation simulation of coma Z[3, ± 1] showed 98,4% accuracy and 98% fit quality; trefoil Z[3, ± 3], 99,9% accuracy and 98% fit quality; spherical aberration Z[4,0], 96,6% accuracy and 97% fit quality; secondary astigmatism Z[4, ± 2], 97,9% accuracy and 98% fit quality. Real ablation on a flat plate of PMMA of coma Z[3, ± 1] showed 96,7% accuracy and 96% fit quality; trefoil Z[3, ± 3], 97,1% accuracy and 96% fit quality; spherical aberration Z[4,0], with 93,9% accuracy and 90% fit quality; secondary astigmatism Z[4, ± 2], with 96,0% accuracy and 96% fit quality. Conclusions. Ablation of aspherical and customised shapes based upon Zernike polynomials up to the the 8th order seems accurate using the dual fluence concept implemented at the AMARIS platform.