Department of Laser and Optoelectronics Engineering, University of Technology, Baghdad, Iraq.
Lasers Med Sci. 2013 May;28(3):871-7. doi: 10.1007/s10103-012-1168-2. Epub 2012 Aug 2.
Due to the wide use of laser systems in human activities, an accidental event of laser exposure may occur where the most susceptible part to injury is the eye. A typical invisible pulsed, far IR, CO2 laser beam was used as an intrabeam accidentally struck an eye leading to raise its temperature to a limit where a pain sensation was started followed by aversion response with a delay of 0.25 s. At this time, the laser beam was assumed to terminate with respect to the cornea. The finite element method (FEM) was used successfully to predict, numerically, the temperature distribution through the anterior part of the eye when subjected to the laser beam. The FEM program was written using Visual Basic 6 coding. The effects of laser parameters such as laser beam profile, pulse width, and repetition rate on the temperature distribution and the consequential thermal damage were studied. The efficiency of the constructed computer program of the present work was examined by the comparison of the predicted results with those obtained from previously published experimental and theoretical works. The comparison shows good agreements.
由于激光系统在人类活动中的广泛应用，可能会发生意外的激光照射事件，而最容易受伤的部位是眼睛。本文采用典型的不可见脉冲远红外 CO2 激光束，作为腔内意外照射眼睛的光束，导致其温度升高到产生疼痛感觉的极限，然后是延迟 0.25s 的回避反应。此时，假设激光束相对于角膜终止。成功地使用有限元方法（FEM）数值预测了眼睛前部受到激光照射时的温度分布。使用 Visual Basic 6 编码编写了 FEM 程序。研究了激光参数（如激光束轮廓、脉冲宽度和重复率）对温度分布和由此产生的热损伤的影响。通过将预测结果与先前发表的实验和理论工作的结果进行比较，检验了本工作中构建的计算机程序的效率。比较表明，结果吻合较好。
