الفهرس 
CORNEAL TOPOGRAPHY AND TOMOGRAPHYOnly 14 pages are availabe for public view
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Abstract
Background: Laser vision correction has been established over the last 2 decades as a safe and effective intervention, with Laser-assisted in situ keratomileusis (LASIK) being one of the main techniques practiced globally. Femtosecond laser-assisted LASIK has become a popularized modification over the last decade and over the standard LASIK technique utilizing mechanical microkeratomes. Aspherical ablation profiles performed by “wavefront optimized” have been employed to reduce spherical aberration associated with myopic corrections.
Aim of the Work: To evaluate the quality and efficacy of topography-guided femtosecond lasik in virgin eyes with myopia, hypermetropia and astigmatism.
Patients and Methods: This comparative prospective study was conducted on 60 eyes of 30 Egyptian patients with comparing preoperative and postoperative outcomes. Eyes with myopia (-1.0 up to -8.0 diopters) or hypermetropia (+1.0 up to +5.0 diopters) or astigmatism (up to 5.0 diopters) or less. Eyes with central corneal thickness (CCT) of 500 microns or more. Eyes at risk for developing post-refractive corneal ectasia, such as keratoconus, keratoconus suspect, previous refractive surgery, corneal dystrophy, corneal guttae or opacities, any previous eye surgery e.g.:pseudophakic patients, retinal detachment surgery, all eyes were normal for example no cataract, no glaucoma, no retinal pathology and no previous trauma.
Results: Our study was performed on sixty eyes of thirty Egyptian patients. Sixty eyes of thirty patients underwent LASIK using T-CAT. Seventeen patients were females and thirteen were males. The average age of the patients was 24.8 year ±5.45 standard deviation (SD). The average spherical error was -3.09 D ±2.33 SD. The average cylinder error was -1.02 D ±1.02 SD.
Conclusion: The results found in our study show that there was statistically significant differences between preoperative BCVA and postoperative UCVA with a good safety and efficiacy profile with T-CAT lasik as no patient loss even one line and 80% of cases gaining at least one line postoperative. The surgery was associated with higher values of high order aberrations after surgery than before surgery.