Igell2013

Page 1

Güell JL (ed): Cataract. ESASO Course Series. Basel, Karger, 2013, vol 3, pp 116–128 DOI: 10.1159/000350913

Laser Corneal Refractive Surgery: An Update Daniel Elies  ·  Jose L. Güell  ·  Paula Verdaguer  ·  Oscar Gris  ·   Felicidad Manero Instituto Microcirugía Ocular, Universidad Autónoma de Barcelona, Barcelona, Spain

Introduction

Lamellar corneal surgery for the correction of refractive errors has been evolving for more than 60 years. LASIK (laser-assisted in situ keratomileusis) is a well-known procedure for correction of different refractive defects as ­myopia, hyperopia and astigmatism. It is the most widely used refractive surgical technique due to its safety and effectiveness, quick visual recovery, and minimal side effects. The introduction of wavefront-guided laser technology into the field of refractive surgery in 1999 rep­ resented a significant advancement in ophthalmology, allowing an optimized correction not only of spherocylindrical errors but also of higher-order aberrations. Femtosecond lasers were introduced in the place of mechanical microkeratomes, and in the past few years have rapidly become accepted as a safe and effective way to create flaps for LASIK, various corneal transplant confi­ gurations, and intracorneal channels for treating ectatic corneal disorders. The ultimate goal has been to create an intrastromal lenticule that can be removed in one piece manually, thereby avoiding the need for photoablation by an excimer laser. The results of the first prospective trials of this technique have been reported. Copyright © 2013 S. Karger AG, Basel

Lamellar corneal surgery for the correction of ­refractive errors has been evolving for more than 60 years, since Dr. Barraquer began developing lamellar corneal surgery in 1948 [1–4]. Fundamentally, refractive lamellar corneal surgery attempts to remove, add, or modify the corneal stroma so that the radius of curvature of the anterior corneal interface is changed as desired. LASIK (laser-assisted in situ keratomileusis) is a well-known procedure for correction of different refractive defects as myopia, hyperopia and astigmatism [5, 6]. Current LASIK uses a hinged flap avoiding corneal instability; it precisely sculpts the stromal bed, sidestepping the pain, corneal haze and regression. Principles, Techniques and Results

LASIK is typically performed in two stages and with two laser platforms: flap creation with a microkeratome or femtosecond laser followed by stromal refractive ablation with the excimer laser.

Downloaded by: University of Hong Kong 198.143.53.1 - 8/18/2015 12:21:40 AM

Abstract


Turn static files into dynamic content formats.

Create a flipbook
Issuu converts static files into: digital portfolios, online yearbooks, online catalogs, digital photo albums and more. Sign up and create your flipbook.