alexa A Review of Corneal Biomechanics after LASIK and SMILE and the Current Methods of Corneal Biomechanical Analysis | OMICS International | Abstract
ISSN: 2155-9570

Journal of Clinical & Experimental Ophthalmology
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Review Article

A Review of Corneal Biomechanics after LASIK and SMILE and the Current Methods of Corneal Biomechanical Analysis

Elizabeth Yang1*, Cynthia J Roberts2 and Jodhbir Singh Mehta1
1Singapore National Eye Centre, 11 Third Hospital Avenue, Singapore
2Department of Ophthalmology and Department of Biomedical Engineering, The Ohio State University, 915 Olentangy River Road, Columbus, OH 4321, United States
Corresponding Author : Elizabeth Yang
31 Woodlands Avenue
New Malden, Surrey
United Kingdom, KT33UL
Tel: +447964975591
E-mail: [email protected]
Received: August 21, 2015; Accepted: December 24, 2015; Published: December 27, 2015
Citation: Yang E, Roberts CJ, Mehta JS (2015) A Review of Corneal Biomechanics after LASIK and SMILE and the Current Methods of Corneal Biomechanical Analysis. J Clin Exp Ophthalmol 6:507. doi:10.4172/2155-9570.1000507
Copyright: © 2015 Yang E, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

Corneal refractive surgeries for the correction of myopia, hyperopia, astigmatism and hyperopia are quick and effective procedures, and have been growing in popularity over the last two decades. However, post-surgery corneal ectasia remains one of the most feared surgical complications. This is where the biomechanical integrity of the cornea begins to fail, with progressive thinning of the stroma, steepening of the cornea, irregular astigmatism, and decreased distance visual acuity. Laser-assisted in-situ keratomileusis (LASIK) is currently the most common refractive surgery procedure. It uses a femtosecond laser or a microkeratome to cut a thin flap on the surface of the cornea. Corneal tissue is then photoablated to correct the refractive error and the flap is then replaced at the end of the procedure. Newer techniques such as small incision lenticule extraction (SMILE) make use of a small incision only, without flap creation, and a lenticule is extracted to correct the refractive error. The avoidance of flap creation should theoretically maintain the integrity of the anterior corneal region and lower the risk of corneal ectasia, but there have been few clinical studies to date that compare the corneal biomechanical outcomes of different procedures. In this review, we highlight the biomechanical differences in outcomes between LASIK and SMILE, as well as explain some of the in vivo and in vitro techniques to investigate corneal biomechanical parameters.

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