الفهرس 
ABLATION PATTERN DEVELOPMENTSOnly 14 pages are availabe for public view
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Abstract
Novel technologies in laser in situ keratomileusis by new
surgical instrumentation has been developed, making the surgical
procedure easier for the surgeon with better excimer laser ablation
algorithms, increasing the optical quality of the ablation and thus the
safety of the vision correction procedure. New techniques have been
obtained that can be classified into two categories: Wavefront
optimized and Wavefront guided algorithms.
The Wavefront optimized approach considers an eye’s
refractive error and preoperative keratometry, in conjunction with the
variable ablation depths of peripherally delivered laser pulses, to
apply a precalculated aspheric ablation that aims to limit induced
SAs and maintaining the original Q value of the cornea.
The Wavefront guided approach renders a customized treatment
plan based on an eye’s unique preoperative aberrometry with the
intent of not only minimizing induced postoperative aberrations but
also reducing or eliminating preoperative HOA.
Many advances in LASIK ablation profiles have been developed
over conventional ones: Q value adjusted and TG (TG).
Aim of work to compare between Q value based ablation and
Topography-guided LASIK as regards safety, visual acuity, contrast
sensitivity and high order aberration HOAs.