Quantitative evaluation of irregular astigmatism by fourier series harmonic analysis of videokeratography data.
Quantitative evaluation of irregular astigmatism by fourier series harmonic analysis of videokeratography data.
复制标题
通过视频角膜摄影数据的傅里叶级数谐波分析定量评估不规则散光。
DOI：
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复制
发表时间：
1998
影响因子：
4.4
通讯作者：
Norio Miyata
中科院分区：
文献类型：
--
作者：
Tetsuro Osbika;A. Tomidokoro;Kyoko Maruo;Tadatoshi Tokunaga;Norio Miyata
目的
定量评估角膜不规则散光与最佳矫正视力的关系。
方法
本文对用计算机角膜摄像仪测得的角膜环上的屈光力进行了傅里叶级数谐波分解。提取球形和规则的晶体成分，在环2至9上定量剩余的不规则晶体成分。通过使用基于每只眼睛的每个环的半径的Stiles-Crawford效应计算加权平均值，并将其用作不规则屈光成分的指数。对108只眼进行了数据分析，其中正常53只眼，圆锥角膜34只眼，圆锥角膜穿透性角膜移植术21只眼。仅当使用硬性接触透镜矫正的视力为20/20或更好时，才将圆锥角膜眼和角膜移植术后的眼纳入研究。分析最佳矫正视力的对数、年龄、疾病类型、屈光散光、不规则散光成分、表面规则性指数和表面不对称性指数。
结果
多元回归分析结果显示，不规则屈光成分与最佳矫正视力显著相关（r = -0.744;校正R2 = 0.549; P < 0.001），而其他解释变量与最佳矫正视力无相关性。
结论
该模型的不规则散光的组成部分似乎是一个有效的，定量的手段来描述角膜不规则散光。
PURPOSE
To assess quantitatively corneal irregular astigmatism in association with best spectacle-corrected visual acuity.
METHODS
Refractive powers on a mire ring measured with computerized videokeratography were decomposed, using the Fourier series harmonic analysis. Extracting spherical and regular astigmatic components, the remaining irregular astigmatic component was quantified on rings 2 through 9. A weighted average was calculated by using the Stiles-Crawford effect on the basis of the radius of each ring of each eye and was used as an index of the irregular astigmatic component. Data analyses were carried out in 108 eyes, including 53 normal eyes, 34 eyes with keratoconus, and 21 eyes that had undergone penetrating keratoplasty for keratoconus. Keratoconic eyes and eyes after keratoplasty were included in the study only if visual acuity, corrected with a hard contact lens, was 20/20 or better. Logarithm of best spectacle-corrected visual acuity, age, type of disease, refractive astigmatism, irregular astigmatic component, surface regularity index, and surface asymmetry index were analyzed.
RESULTS
In results of multiple regression analysis, the irregular astigmatic component was significantly correlated with best spectacle-corrected visual acuity (r = -0.744; adjusted R2 = 0.549; P < 0.001), whereas other explanatory variables showed no correlation with best spectacle-corrected visual acuity.
CONCLUSIONS
This model of the irregular astigmatic component seems to be an efficient, quantitative means of describing corneal irregular astigmatism.
从角膜照片的计算机辅助分析得出的角膜形状的定量描述符。
DOI：
--
发表时间：
1989
期刊：
Refractive & corneal surgery
影响因子：
--
作者：
Dingeldein,SA;Klyce,SD;Wilson,SE
通讯作者：
Wilson,SE
影响因子：
4.4
作者：
N. Maeda;S. Klyce;M. Smolek;H. Thompson
通讯作者：
N. Maeda;S. Klyce;M. Smolek;H. Thompson