الفهرس 
CORNEA
Difference Between (Intacs and Kerarings):Only 14 pages are availabe for public view
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Abstract
Keratoconus is a bilateral, noninflammatory, progressive ectatic corneal disorder characterized by thinning and protrusion of the central cornea resulting in progressive myopia, regular and irregular astigmatism. It can be managed with spectacles or contact lenses, in the early stages of the disease. Until the last decade of the twenteeth century, keratoplasty procedures were the only alternative to treat this pathological condition. In the beginning of the twenty one century, intracorneal ring segments implantation was proposed as a therapeutic choice for treating keratoconus patients, aiming for delaying or avoiding corneal grafting. ICRSs act by exerting an ‘‘arc-shortening effect’’ on the corneal lamellae that flattens the central cornea. Different types of ICRS are present, Intacs, Ferrara and Kerarings. They differ depending on their curvature, width, and the zone of implantation. Kerarings are characterized by triangular cross sections that induce a prismatic effect on the cornea, reducing glare. The optical zone provided by the segments is 5.0 mm in diameter. Tunnel creation for segment implantation can be performed mechanically or through the femtosecond laser. The femtosecond laser can create an accurate and uniform 360° depth.
THE OBJECTIVE OF THIS STUDY WAS TO ASSESS THE EFfiCACY OF KERARINGS USING FEMTOSECOND LASER FOR TREATING KERATOCONUS.