الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Myopia, being one of the commonest refractive error, is known to be an optical aberration, where the parallel light rays from a distant image got focused on a certain point anterior to the retina. The prevalence of myopia has the highest prevalence in East and Southeast Asia. Its prevalence in China is (49.7%), in the States (20.0%), Australia (11.9%), India (9.7%), Nepal (16.5%), and Cambodia (6.0%).
The treatment of myopia is mainly refractive surgery to avoid further comorbidities. Different procedures have been used in refractive surgery which include photorefractive keratectomy (PRK), radical keratotomy (RK), laser-assisted in situ keratomileusis (LASIK), laser thermal keratoplasty (LTK), small incision lenticule extraction (SMILE) etc. Femtosecond uses ultra-short duration of the pulses causing significantly less damage to the collateral tissues. Therefore, currently femtosecond LASER has been demonstrated to be the safest amongst the refractive surgical techniques. Thus, the current study aimed to study the effect of myopic excimer laser refractive surgery on choroidal thickness. This is a cohort study on myopic patients who are eligible for myopic excimer laser refractive surgery, femto-LASIK. The study was performed in the ophthalmology Department of Menoufia University hospitals and private ophthalmic center, Egypt.
Patients were selected according to the inclusion and exclusion criteria: Inclusion criteria of the patients included in the study including: patients with myopia with or without myopic astigmatism, age not less than 18 years, refractive stability for at least 1 year before the procedure, Residual bed thickness not less than 60% of the total thickness of cornea Percentage of Tissue Altered (PTA)