الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Myopia (nearsightedness) is an eye disorder where light focuses in front of, instead of on, the retina. This causes distant objects to be blurry while close objects appear normal. Other symptoms may include headaches and eye strain. Severe Myopia is associated with an increased risk of retinal detachment, cataracts, and glaucoma. Photorefractive keratectomy (PRK) is a surgical procedure for the treatment of refractive error and higher order wavefront aberrations. PRK for myopia is a surface ablation procedure that flattens the cornea by removing corneal tissue centrally, thereby changing the refractive power of the cornea and reducing myopia and may be combined with a reduction of the higher order aberrations specific to the eye. Small incision lenticule extraction (SMILE), originally called Femtosecond lenticule extraction (FL Ex), is a form of laser based refractive eye surgery developed by Carl Zeiss Meditec used to correct myopia, and astigmatism. Although similar to LASIK laser surgery, the intrastromal procedure is novel in that it uses a single femtosecond laser referenced to the corneal surface to cleave a thin lenticule from the corneal stroma for manual extraction. It has been described as a painless procedure. This study was conducted to compare the visual and refractive outcomes following Photorefractive Keratectomy (PRK) and Femto-SMILE (Small-Incision Lenticule Extraction) for myopic patients. The study included was conducted on 80 eyes of 40 patients with myopia who were classified into 2 equal groups according to the treatment regimen; photo refractive keratectomy (PRK) group and femto-SMILE (Small-incision Lenticule Extraction) group. In the current study, there was statistically significant improvement in the mean UCVA in the two-study group postoperative as compared with the preoperative BCVA value (p < 0.05). The degree of improvement was better in the PRK group. The mean postoperative UCVA after treatment was statistically significantly higher in the PRK group as compared with the femto-SMILE group (p < 0.05). The mean myopia before treatment and after treatment were statistically significantly higher in the femto-SMILE group as compared with the PRK group (p < 0.05). There was statistically significant decrease in the mean myopia in the two-study group postoperative as compared with the preoperative value (p < 0.05). The degree of improvement was higher in the femto-SMILE group. In the current study, there was statistically significant decrease in the mean astigmatism in the two-study group postoperative as compared with the preoperative value (p < 0.05). The degree of improvement was higher in the femto-SMILE group. There was statistically significant decrease in the mean K1 and K2 in the two-study group postoperative as compared with the preoperative value (p < 0.05). The mean K1 and K2 after treatment were statistically significantly higher in the PRK group as compared with the femto-SMILE group (p < 0.05) that means better improvement in association with femto-SMILE group.