利用Hwey-Lan Liou模型眼研究的复曲面人工晶状体焦深的变化  

Change of the focused depth of biconvex Toric intraocular lens in Hwey-Lan Liou schematic eye

作　　者：杨欣[1] 张斌[1] 刘丹岩[1] 杜颖华[1] 郭从容[1] 崔月先[1] 

机构地区：[1]河北医科大学第二医院眼科,石家庄050000

出　　处：《中华实验眼科杂志》2015年第4期347-350,共4页Chinese Journal Of Experimental Ophthalmology

基　　金：河北省2013年医学科学研究课题计划项目（冀卫函[2013]167号）

摘　　要：背景 复曲面人工晶状体（IOL）虽然能有效矫正角膜散光,提高患者的视觉质量,但由于其光学结构复杂,故许多条件下其光学质量与球面IOL存在差异.目的 评价和比较复曲面IOL、球面IOL和非球面IOL在复色光环境下的焦深变化.方法用Zemax光学设计软件建立Hwey-Lan Liou模型眼,采用光线追迹法进行计算,评价并比较Tecnis ZA9003 IOL、SN60AT IOL、Arcysof Toric IOL在复色光条件下和在不同瞳孔直径条件下的焦深变化,并绘制离焦曲线.结果 瞳孔直径为3 mm时,球面和复曲面IOL在离焦=0的情况下均有较好的调制传递函数（MTF）,上述3种IOL的焦深范围非常接近,正负方向的离焦曲线对称.瞳孔直径为5 mm时,球面和复曲面IOL的MTF明显较瞳孔直径为3 mm时降低,离焦MTF曲线向负离焦方向偏移,焦深较瞳孔直径3 mm时减小.非球面IOL的离焦MTF稳定,不随瞳孔直径的增大而发生明显变化,但焦深明显减小.结论 复曲面IOL有与球面IOL相近的焦深变化规律,焦深随着瞳孔直径的增大而减小,对负离焦耐受较好.Background Toric intraocular lens （IOL） has two optical powers in two perpendicular directions,and it could result in many different optic performance from spherical IOL.Objective This study was to evaluate the depths of focus of spherical,aspherical and Toric IOL under polychoromatic light by Hwey-Lan Liou schematic eye.Methods Hwey-Lan Liou schematic eye was created using Zemax software,and the alterations of focusing depth of Tecnis ZA9003 IOL （a spherical IOL）,SN60AT IOL （a aspherical IOL）,Arcysof Toric IOL were evaluated and compared based on Hwey-Lan Liou schematic eye by ray tracing method.Results The modulation transfer function （MTF） was perfect and the depth of defocus was equal under the zero defocus and under the pupil diameter of 3 mm with symmetrical focus curve in plus or minus two-axis in both spherical IOL and Toric IOL.The MTF decreasing with 5 mm pupil compared with that with 3 mm pupil.The MTF was declined under the pupil diameter of 5 mm compared with 3 mm in spherical IOL and Toric IOL along with the decrease of focus depth and the drifting of MTF toward negative axis.However,only the focus depth was decreased but MTF appeared to be stable in aspherical IOL.Conclusions Toric IOL and spherical IOL exhibit similar trends in focus depth change,and their focus depths decrease with the increase of pupil diameter.In addition,Toric IOL and spherical IOL show good light focus during minus defocus shifting.

关 键 词：人工晶状体 散光 模型眼 焦深 

分 类 号：R779.66[医药卫生—眼科]