Beiko George H H
J Cataract Refract Surg. 2007 Aug;33(8):1455-60. doi: 10.1016/j.jcrs.2007.04.019.
To compare contrast sensitivity after phacoemulsification with implantation of the Tecnis intraocular lens (IOL) between patients with a selected preoperative corneal spherical aberration and patients without a selected amount of aberration.
Private practice, St. Catharines, Ontario, Canada.
Thirty-three cataract patients were divided into 2 groups. The first group (n = 13) included consecutive patients with a spherical aberration of at least +0.33 microm measured with the Oculus Easygraph. Consecutive patients meeting the inclusion criteria (n = 20) were included in the second group. All patients had phacoemulsification with implantation of the Tecnis IOL. After 3 to 5 weeks, contrast sensitivity was measured by sinusoidal grating charts for distance under photopic (85 cd/m2) and mesopic (3 cd/m2) conditions with optical correction in place. Five standard spatial frequencies were tested.
All surgical procedures and postoperative courses were uneventful. The IOLs were in the bag without decentration or tilt. The mean preoperative spherical aberration was +0.370 microm +/- 0.024 (SD) in the first group and +0.291 +/- 0.081 microm in the second group (P = .0010). Patients in the first group had better contrast sensitivity than those in the second group. Statistically significant differences were detected at spatial frequencies of 6.0 cycles per degree (cpd) and 12 cpd under photopic conditions (P = .0267 and P = .0215, respectively) and mesopic conditions (P = .0356 and P = .0217, respectively).
The Tecnis IOL has a negative spherical aberration of -0.27 microm. Targeting for a postoperative mean residual spherical aberration of approximately +0.10 microm by selecting patients according to their preoperative spherical aberration resulted in better contrast sensitivity.
比较植入Tecnis人工晶状体（IOL）的白内障超声乳化术后，术前角膜球差处于特定范围的患者与术前角膜球差未处于该特定范围的患者之间的对比敏感度。
加拿大安大略省圣凯瑟琳市的私人诊所。
33例白内障患者被分为2组。第一组（n = 13）包括使用Oculus Easygraph测量出球差至少为+0.33微米的连续患者。符合纳入标准的连续患者（n = 20）被纳入第二组。所有患者均接受了超声乳化联合Tecnis IOL植入术。3至5周后，在明视（85 cd/m2）和中视（3 cd/m2）条件下，通过正弦波光栅图在佩戴合适的光学矫正眼镜时测量距离视力的对比敏感度。测试了5个标准空间频率。
所有手术过程和术后恢复均顺利。IOL均位于囊袋内，无偏心或倾斜。第一组术前平均球差为+0.370微米±0.024（标准差），第二组为+0.291±0.081微米（P = 0.0010）。第一组患者的对比敏感度高于第二组。在明视条件下，空间频率为6.0周/度（cpd）和12 cpd时检测到统计学上的显著差异（分别为P = 0.0267和P = 0.0215），在中视条件下也有显著差异（分别为P = 0.0356和P = 0.0217）。
Tecnis IOL的负球差为-0.27微米。根据患者术前球差选择患者，使术后平均残余球差约为+0.10微米，可获得更好的对比敏感度。
