人工晶状体前表面非球面化改良能够改善视觉质量(英文)

Improving quality of vision with an anterior surface modified prolate intraocular lens:A prospective clinical trial

目的:根据对比敏感度结果比较前表面改良的非球面Tecnis Z9000 IOL和标准的911A IOL的光学性能。方法:Tecnis Z9000硅凝胶IOL和911A IOL具有共同的基本特征包括12mm总长度、三片直边双凸6mm的光学直径和成角的聚丙乙烯C襻。对连续10例双侧白内障患者(20眼)进行了随机前瞻研究,所有患者都接受了白内障超声乳化手术并随机于1眼植入Tecnis Z9000 IOL,另1眼在术后6wk内植入911A IOL作为对照,术后6wk进行对比敏感度检查,所得数据采用秩和检验进行比较。结果:随机植入Tecnis IOL组的术前平均最佳Snellen矫正视力为6/8.5(0.70),植入911AIOL组为6/9.4(0.64),所有20眼术后最佳矫正视力都达到了6/6(1.0)。术后对比敏感度分析发现两组在12和18cpd(明视)、1.5和3cpd(暮视)以及1.5和3cpd(暮视伴眩光)均有统计学差异(P<0.05)结论:Tecnis Z9000 IOL被证明其对比敏感度在明视高空间频率和暮视低空间频率方面均显著优于911A IOL。

AIM： To compare the optical performance of the anterior surface modified prolate Tecnis Z9000 IOL with the standard 911A IOL in terms of contrast sensitivity outcomes. METHODS： The Tecnis Z9000 silicone IOL shares the same basic characteristics with the 911A IOL including a 12.0mm overall diameter, 3-piece equiconvex 6.0mm optic and angulated cap C polyvinylidene fluoride haptics. This is a randomized prospective study that involved ten consecutive patients （20 eyes） with bilateral cataracts. Each patient underwent phacoemulsification and received randomly the Tecnis Z9000 IOL in one eye and the control （911A IOL） in the fellow eye within 6 weeks period of one another. Contrast sensitivity was measured after six postoperative weeks. The collected data were analyzed through using Hann Whitney U test. RESULTS： The mean pre-operative best spectacle corrected Snellen visual acuity in the eyes that were randomly selected to receive the Tecnis IOL was 6/8.5 （0.70） and in the eye selected to receive the 911A IOL was 6/9.4 （0.64）. Postoperatively all 20 eyes achieved best corrected Snellen visual acuity of 6/6 （1.0）. Postoperative contrast sensitivity testing showed statistically significant differences （P〈0.05） between the two IOLs at 12 and 18 cpd under photopic, at 1.5 and 3 cpd under mesopic, and at 1.5 and 3 cpd under mesopic with glare conditions. CONCLUSION： The Tecnis Z9000 IOL proved to have statistically significant superior contrast sensitivity to the 911A IOL at high spatial frequencies under photopic conditions and at low spatial frequencies under mesopic and mesopic with glare conditions.