Mester Ulrich, Sauer Thomas, Kaymak Hakan
Department of Ophthalmology, Knappschafts Hospital, Sulzbach, Germany.
J Cataract Refract Surg. 2009 Mar;35(3):485-90. doi: 10.1016/j.jcrs.2008.09.028.
To compare the tilt and decentration of a single-piece aspheric intraocular lens (IOL) and the position of the natural crystalline lens in young individuals.
Department of Ophthalmology, Knappschafts Hospital, Sulzbach, Germany.
This prospective noncomparative single-center study included volunteers younger than 40 years with no ocular abnormalities (crystalline lens group) and patients older than age 62 who had uneventful cataract surgery and Tecnis ZCB00 IOL implantation (IOL group). All eyes were examined with the OPD-Scan II; spherical aberration, vertical coma Z(3,-1), and horizontal coma Z(3,1) were analyzed with a 5.0 mm pupil. Lens tilt and decentration were studied with a new Purkinje meter.
The crystalline lens group and IOL group comprised 20 subjects (40 eyes) each. Both groups showed compensation for corneal spherical aberration and neutralization of horizontal corneal coma. All lenses were tilted upward (mean 2.2 degrees, crystalline lens; 2.5 degrees, IOL) and to the temporal side (mean 3.1 degrees, crystalline lens; 2.6 degrees, IOL). The crystalline lenses were decentered downward (mean 0.16 mm) and to the temporal side (mean 0.07 mm). The IOL was displaced to the nasal side of the pupil (mean 0.06 mm) with almost no vertical mean decentration (0.02 mm upward).
The aspheric IOL and young crystalline lens compensated for mean corneal spherical aberration, resulting in low total spherical aberration. The position of the IOLs showed minimal decentration and tilt and was mirror symmetrical, comparable to the position of the crystalline lens in young individuals. The slight malpositioning partially compensated for corneal horizontal coma.
比较单片非球面人工晶状体（IOL）的倾斜和偏心情况以及年轻人自然晶状体的位置。
德国苏尔茨巴赫克纳普沙夫茨医院眼科。
这项前瞻性非对照单中心研究纳入了年龄小于40岁且无眼部异常的志愿者（晶状体组）以及年龄大于62岁且白内障手术顺利并植入Tecnis ZCB00 IOL的患者（IOL组）。所有眼睛均用OPD-Scan II进行检查；使用5.0毫米瞳孔分析球差、垂直彗差Z(3, -1)和水平彗差Z(3, 1)。用新型浦肯野计研究晶状体的倾斜和偏心情况。
晶状体组和IOL组各有20名受试者（40只眼）。两组均显示出对角膜球差的补偿以及水平角膜彗差的中和。所有晶状体均向上倾斜（晶状体平均2.2度；IOL平均2.5度）并向颞侧倾斜（晶状体平均3.1度；IOL平均2.6度）。晶状体向下偏心（平均0.16毫米）并向颞侧偏心（平均0.07毫米）。IOL向瞳孔鼻侧移位（平均0.06毫米），几乎没有垂直方向的平均偏心（向上0.02毫米）。
非球面IOL和年轻晶状体补偿了平均角膜球差，导致总球差较低。IOL的位置显示出最小的偏心和倾斜，并且呈镜像对称，与年轻人晶状体的位置相当。轻微的位置异常部分补偿了角膜水平彗差。
