الفهرس 
Descemet’s MembraneOnly 14 pages are availabe for public view
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Abstract
Corneal refractive surgeries have been raised in popularity in recent years as it offers a long-term solution to myopia, hyperopia, astigmatism and presbyopia, and is generally viewed as safe and effective. Despite the advances and availability of corneal refractive surgery, the biomechanical properties of the pre and post-operative cornea are not well characterized. The biomechanical properties of corneal tissue determine how it will respond and deform when placed under stress, and this response is different depends on the difference of the biomechanical properties between the corneas.[173]Corneal biomechanical properties are of major importance in laser refractive surgery and must be taken into consideration to reduce the risk for iatrogenic ectasia.[209] CORVIS_ST applies air pulse on the cornea,then observes and records the movements using a high-speed Scheimpflug video camera in real time.[218] With 4330 frames per second, the CORVIS ST records the dynamic deformation and determines the velocity, length, and time lapse during applanation andhighest concavity.[209]With a growing volume of refractive surgeries worldwide, the aim of this study was to compare LASIK with SMILE for myopia studying the postoperative change in corneal biomechanical properties, which are often a precursor of clinically significant ectasia.