[1]张蝶念,张红,田芳,等. 老年性白内障患者中角膜后表面散光对总角膜散光的影响[J].眼科新进展,2015,35(7):652-655.[doi:10.13389/j.cnki.rao.2015.0178]
　ZHANG Die-Nian,ZHANG Hong,TIAN Fang,et al. Effects of posterior corneal astigmatism on total corneal astigmatism in age-related cataract[J].Recent Advances in Ophthalmology,2015,35(7):652-655.[doi:10.13389/j.cnki.rao.2015.0178]
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 老年性白内障患者中角膜后表面散光对总角膜散光的影响
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《眼科新进展》[ISSN:1003-5141/CN:41-1105/R]

卷:
35卷
期数:
2015年7期
页码:
652-655
栏目:
应用研究
出版日期:
2015-07-05

文章信息/Info

Title:
 Effects of posterior corneal astigmatism on total corneal astigmatism in age-related cataract
作者:
 张蝶念; 张红; 田芳; 张磊
 300384　天津市，天津医科大学眼科医院
Author(s):
 ZHANG Die-Nian; ZHANG Hong; TIAN Fang; ZHANG Lei
 Tianjin Medical University Eye Hospital , Tianjin 300384 , China
关键词:
 ; 角膜后表面散光; 总角膜散光; 模拟角膜曲率计散光; 老年性白内障
Keywords:
 ; posterior corneal astigmatism;  total corneal astigmatism;  simulated keratometry astigmatism ;  age-related cataract
DOI:
10.13389/j.cnki.rao.2015.0178
文献标志码:
A
摘要:
 目的　研究老年性白内障患者模拟角膜曲率计散光和总角膜散光大小及轴位的差异，评价角膜后表面散光对总角膜散光的影响。方法　８０例老年性白内障患者（１０５眼，左４７眼，右５８眼）手术前行Ｐｅｎｔａｃａｍ检查，记录角膜前后表面散光，并对角膜前后表面散光行相关性分析。模拟角膜曲率计散光用屈光指数１．３３７５及角膜前表面曲率半径计算，总角膜散光由前后表面散光在角膜后表面的矢量合计，计算模拟角膜曲率计散光和总角膜散光的矢量差Ｅ→、大小差Ｅ和轴位差Ａ。结果　角膜前表面散光和后表面散光大小间无明显相关性（Ｐ＝０．９８），后表面散光对前表面散光的平均补偿作用为５．７９％。总角膜散光及模拟角膜曲率计散光大小分别为（１．１２±０．６５）Ｄ和（１．０７±０．６４）Ｄ，差异具有统计学意义（ｔ＝－２．４０，Ｐ＝０．０２）；两者轴位分别为（６７．９３±５６．５０）°和（６８．９０±５９．６８）°，差异无统计学意义（ｔ＝－０．２７，Ｐ＝０．７９）。散光值大小及轴位差异的算术均值分别是（０．０５±０．２３）Ｄ和（－０．５７±１３．０２）°，绝对值是（０．１９±０．１５）Ｄ和（７．００±１０．９７）°。两者散光大小差别大于０．５０Ｄ或轴位差别大于１０°的有３０眼，占２８．５７％。结论　老年性白内障患者忽略角膜后表面测量可能会导致具有临床意义的角膜散光值估计的差异。
Abstract:
 Objective To evaluate the effects of posterior astigmatism ( PA) on total corneal astigmatism by the difference of magnitude and axis between simulated keratometry astigmatism and total corneal astigmatism in age-related cataract. Methods A rotating Scheimpflug camer a ( Pentacam Oculus , Wetzlar, Germany) was used to measure 105 eyes of 80 patients for cataract surgery. Both anterior stigmatism ( AA) and PA were recorded. The simulated keratometry astigmatism ( KA) was calculated by the anterior corneal surface measurement and the index of l. 3375 ,while the total corneal astigmatism ( TA) was derived by doubled-angle vector analysis of the astigmatisms on both corneal surfaces. Then . the differences of vector , magnitude , axis were calculated between KA and TA. Results AA and PA had no obvious relationship (P > 0. 98) , the compensation effects of PA on AA was 5. 7g% . The magnitude of KA and TA were ( 1. 12 +0. 65 ) D and ( 1. 07 + 0. 64 ) D, respectively , and there was significant difference ( t = - 2. 40 .P = 0. 02) . The axis of KA and TA were ( 67. 93 + 56. 50 ) o and ( 68. 90 + 59. 68) o ,respectively, there was no significant difference ( t = - 0. 27 .P = 0. 79 ) . The mean arithmetic and absolute error of KA for TA magnitude were ( 0. 05 + 0. 23 ) D and (0. 19 +0. 15)o,respectively. The mean arithmetic and absolute error of KA for TA axis were ( - 0. 57 + 13. 02) D and ( 7. 00 + 10. 97 ) o ,respectively. In the whole study ,30 eyes (28. 57% ) had either a magnitude difference more than 0. 50 D or an axis difference more than 100 between KA and TA. Conclusion Omission of PA may lead to clinical significant inaccuracies in estimating of the corneal astigmatism in age-related cataract patients.

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更新日期/Last Update: 2015-07-03