Biomechanical Modeling of Refractive Corneal Surgery

Author:

Alastrué V.1,Calvo B.1,Peña E.1,Doblaré M.1

Affiliation:

1. Group of Structural Mechanics and Material Modelling, Aragon Institute of Engineering Research (I3A), University of Zaragoza, Spain

Abstract

The aim of refractive corneal surgery is to modify the curvature of the cornea to improve its dioptric properties. With that goal, the surgeon has to define the appropriate values of the surgical parameters in order to get the best clinical results, i.e., laser and geometric parameters such as depth and location of the incision, for each specific patient. A biomechanical study before surgery is therefore very convenient to assess quantitatively the effect of each parameter on the optical outcome. A mechanical model of the human cornea is here proposed and implemented under a finite element context to simulate the effects of some usual surgical procedures, such as photorefractive keratectomy (PRK), and limbal relaxing incisions (LRI). This model considers a nonlinear anisotropic hyperelastic behavior of the cornea that strongly depends on the physiological collagen fibril distribution. We evaluate the effect of the incision variables on the change of curvature of the cornea to correct myopia and astigmatism. The obtained results provided reasonable and useful information in the procedures analyzed. We can conclude from those results that this model reasonably approximates the corneal response to increasing pressure. We also show that tonometry measures of the IOP, underpredicts its actual value after PRK or LASIK surgery.

Publisher

ASME International

Subject

Physiology (medical),Biomedical Engineering

Reference38 articles.

1. Understimation of Intraocular Pressure in Eyes After Laser In Situ Keratomileusis;Akimoto;Jpn. J. Ophthalmol.

2. Computer simulation of arcuate keratotomy for astigmatism;Hanna;Refract. Corneal Surg.

3. A Microstructurally-Based Finite Element Model of the Incised Human Cornea;Pinsky;J. Biomech.

4. Applanation Tonometry and Correction According to Corneal Thickness;Stodtmeister;Acta Ophthalmol. Scand.

5. Effect of Corneal Thickness in Intraocular Pressure Measurements With the Pneumotonometer, Goldmann Applanation Tonometer, and Tono-Pen;Bhan;Invest. Ophthalmol. Visual Sci.

Cited by 137 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3