Hwey—Lan Liou模型眼复曲面人工晶状体偏心及旋转对成像质量的影响  

Optical performance of rotation and decentration of Toric intraocular lens implant in Hwey-Lan Liou model eye

作　　者：柴茜楠[1] 张斌[1] 耿玉欣[1] 杜颖华[1] 刘丹岩[1] 马菲妍 魏玉华[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》2017年第11期1003-1008,共6页Chinese Journal Of Experimental Ophthalmology

摘　　要：背景 研究证实白内障囊外摘出联合Toric人工晶状体（IOL）植入术能够有效矫正角膜散光，改善患者的裸眼视力，但Toric IOL植入后可能因偏心及旋转造成IOL的位移误差，其对成像质量的影响与球面IOL有何不同值得关注和研究。 目的 评价Toric IOL的旋转和偏心对成像质量和波前像差的影响。 方法 将放在Hwey-Lan Liou模型眼中的SN60AT球面IOL和Toric IOL沿各自的子午线和不同轴位偏移，子午线间隔为5°，轴位偏离自中心沿0°～90°方向，偏心量分别是0.25、0.50和0.75 mm，Toric IOL在模型眼中模拟旋转5°和10°，评价和比较不同IOL偏心量和旋转度对成像质量及波前像差的影响。 结果 球面IOL与Toric IOL居中时各瞳孔直径下调制传递函数（MTF）曲线在各空间频率时都非常接近4 mm瞳孔直径条件下，偏心0.25 mm时SN60AT IOL 6 c/d和12 c/d的MTF值分别为0.581 087和0.411 960，T3 IOL分别为0.454 259和0.382 313，T4 IOL分别为0.426 020和0.360 490，T5 IOL分别为0.425 606和0.359 877。偏心0.50 mm时SN60AT IOL 6 c/d和12 c/d的MTF值分别为0.573 073和0.412 787，T3 IOL分别为0.450 943和0.379 481，T4 IOL分别为0.423 153和0.356 664，T5 IOL分别为0.422 881和0.356 230。偏心0.75 mm时SN60AT IOL 6 c/d和12 c/d的MTF值分别为0.560 038和0.413 624，T3 IOL分别为0.445 597和0.374 322，T4 IOL分别为0.418 522和0.350 087，T5 IOL分别为0.418 468和0.349 976。分别沿0°、5°、10°、90°子午线偏心时MTF值非常接近。球面IOL与Toric IOL的均方根值（RMS）随着偏心量的增加而递增，其中彗差的增加较为显著，T4 IOL偏心0.75 mm时慧差由居中时的0增加到C（3，－1）－0.049 79 μm、C（3，1）－0.037 59 μm；三叶草像差增加到C（3，3）0.005 72 μm、C（3，－3）0.004 64 μm，散光有少许增加。Toric IOL旋转角度由5°增大至10°时，高空间频率下的成像质量显著下降，Toric IOL旋转时的RMS的变化主要由散�Background Cornea astigmatism can be effectively corrected by implanting Toric intraocular lens （IOL） during cataract surgery and therefore improve visual acuity of patients.However, the decentration and rotation position errors were inevitable sometime.What＇s the difference of effect of position errors on quality of image between spherical IOL and Toric IOL needs further research. Objective This study was to evaluate the optical performance and wavefront with rotation and decentration of Toric IOL. Methods Different decentration for SN60AT IOL（spherical IOL） and Toric IOL in Hwey-Lan Lion model eyes was set with the role as follows： decentration 0.25 mm to 0.75 mm in a 5°-interval from 0° to 90°.Furthermore, Toric IOL was rotated at 5° and 10°, respectively.Then the image performances of SN60AT IOL and Toric IOL at different decentration distances and rotated degrees were evaluated with modulation transfer function （MTF） and value of wavefront aberration under all conditions. Results At the centration, the MTF curves of spherical IOL and Toric IOL were similar under 3, 4 and 5 mm pupil diameter at each spatial frequency.Under the condition of 4 mm pupil diameter, when the decentration was 0.25 mm, the MTF values of SN60AT IOL at 6 c/d and 12 c/d were 0.581 087 and 0.411 960, respectively.T3 IOL were 0.454 259 and 0.382 313, T4 IOL were 0.426 020 and 0.360 490, T5 IOL were 0.425 606 and 0.359 877.When the decentration was 0.50 mm, the MTF values of SN60AT at 6 c/d and 12 c/d were 0.573 073 and 0.412 787, respectively.T3 IOL were 0.450 943 and 0.379 481, T4 IOL were 0.423 153 and 0.356 664, T5 IOL were 0.422 881 and 0.356 230.When the decentration was 0.75 mm, the MTF values of SN60AT at 6 c/d and 12 c/d were 0.560 038 and 0.413 624, respectively.T3 IOL were 0.445 597 and 0.374 322, T4 IOL were 0.418 522 and 0.350 087, T5 IOL were 0.418 468 and 0.349 976.When the IOL decentralized along 0°, 5°, 10°, 90°meridian line, the MTF values were almostly same.The root mean square （RMS） o

关 键 词：人工晶状体 眼部屈光/生理性 散光/生理病理性 人工晶状体植入 偏心 成像质量 视力/生理性 高阶像差 

分 类 号：R779.6[医药卫生—眼科]