Dynamical Simulation of Cornea Deformation in Laser Surgery

A dynamical simulation method is presented to model the cornea deformation in surgery of laser thermokeratoplasty. The virtual cornea is constructed as a mass-spring system. The corneal surface tension is simulated by damping spring stretch between mass points on the cornea model. The aqueous humor...

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Bibliographic Details
Published inWuhan University journal of natural sciences Vol. 16; no. 4; pp. 332 - 336
Main Authors Gao, Mingxiang, Chen, Dingfang, Yang, Yanfang
Format Journal Article
LanguageEnglish
Published Heidelberg Wuhan University 01.08.2011
Subjects
Biomedical and Life Sciences
Computer Science
Life Sciences
Materials Science
mass-spring model
TP 391.9
dynamical simulation
laser thermokeratoplasty
cornea model
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Summary:A dynamical simulation method is presented to model the cornea deformation in surgery of laser thermokeratoplasty. The virtual cornea is constructed as a mass-spring system. The corneal surface tension is simulated by damping spring stretch between mass points on the cornea model. The aqueous humor in the eyeball is modeled as ideal gas, and the intraocular pressure is simulated by gas pressure. The coagulation force is exerted on each photocoagulation spot to demonstrate its collapse caused by the condensation of corneal soft tissue irradiated by laser. An extra viscous drag force is added to each mass point to weaken the mass point oscillation. The use of the effective time-corrected Verlet integral method brings about flowing and stable dynamic simulation procedures. The simulation results show that, comparing to the undeformed model, the curvature of the region between the optical center and photocoagulation spot increases obviously. Moreover, the shape of the deformed virtual cornea is much similar to that of the real cornea after surgery.
Bibliography:dynamical simulation; cornea model; mass-spring model; laser thermokeratoplasty
A dynamical simulation method is presented to model the cornea deformation in surgery of laser thermokeratoplasty. The virtual cornea is constructed as a mass-spring system. The corneal surface tension is simulated by damping spring stretch between mass points on the cornea model. The aqueous humor in the eyeball is modeled as ideal gas, and the intraocular pressure is simulated by gas pressure. The coagulation force is exerted on each photocoagulation spot to demonstrate its collapse caused by the condensation of corneal soft tissue irradiated by laser. An extra viscous drag force is added to each mass point to weaken the mass point oscillation. The use of the effective time-corrected Verlet integral method brings about flowing and stable dynamic simulation procedures. The simulation results show that, comparing to the undeformed model, the curvature of the region between the optical center and photocoagulation spot increases obviously. Moreover, the shape of the deformed virtual cornea is much similar to that of the real cornea after surgery.
42-1405/N
GAO Mingxiang, CHEN Dingfang, YANG Yanfang 1. School of Science, Wuhan University of Technology, Wuhan 430063, Hubei, China; 2. Research Institute of Intelligent Manufacture and Control, Wuhan University of Technology, Wuhan 430063, Hubei, China
ISSN:1007-1202
1993-4998
DOI:10.1007/s11859-011-0759-2