Refractive Correction Of Myopia And Myopic Astigmatism

1092 WordsDec 12, 20165 Pages
Femtosecond lenticule extraction is a new method for refractive correction of myopia and myopic astigmatism.1 The only available femtosecond laser platform to perform this surgery is Visumax (Carl Zeiss Meditec AG, Jena, Germany). During the femtosecond lenticule extraction procedure, an intrastromal lenticule is created between two photodisruption planes (ie, cuts) and mechanically removed for refractive correction. The anterior lamellar cut is parallel to the corneal surface at a preset depth. The depth and shape of the posterior cut determine the thickness, shape, and refractive power of the removed lenticule. Corneal cuts are performed from posterior to anterior, as once a photodisruption plane is created the bubbles make deeper structures untreatable for the femtosecond laser platform. In the small incision lenticule extraction (SMILE) procedure, the anterior lamellar cut is similar to the flap cut in a femtolaser-assisted laser in situ keratomileusis (LASIK) procedure, and the stromal tissue anterior to the anterior lamellar cut is called the “cap”. However, the side cut is only 3–4 mm (50°–60°) in length in contrast to the approximate 310° side cut of a LASIK flap. However in femtosecond laser lenticule extraction (FLEX), the side cut is elongated similar to a LASIK flap, and the cap is lifted as a femtolasik flap to remove the underlying lenticule. In the current study, we investigated the accuracy of cap thickness in patients treated with SMILE and compared it

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