均方预测误差
眼科
散光
医学
折射误差
视力
屈光度
光线追踪(物理)
假性白内障
人工晶状体度数计算
人工晶状体
白内障手术
球差
验光服务
正视
镜头(地质)
角膜
眼睛畸变
光学
折射
角膜曲率计
Scheimpflug原理
角膜地形图
数学
物理
算法
作者
Julian Langer,Mehdi Shajari,Thomas C. Kreutzer,Siegfried G. Priglinger,Wolfgang J. Mayer,Marc J. Mackert
出处
期刊:Journal of Refractive Surgery
[SLACK, Inc.]
日期:2021-05-01
卷期号:37 (5): 312-317
被引量:1
标识
DOI:10.3928/1081597x-20210222-03
摘要
Purpose To compare different new-generation biometric formulas and ray-tracing for small-aperture intraocular lens (IOL) (IC-8; Acufocus, Inc) implantation in patients undergoing cataract and refractive lens exchange surgery with highly irregular corneas. Methods This monocenter study included 17 eyes of 17 patients with highly irregular corneas of different genesis. Biometric and topographic corneal data were assessed using the IOLMaster 700 (Carl Zeiss Meditec) and Pentacam (Oculus Optkigerate GmbH). Prediction and absolute error were compared after 3 months based on manifest refraction. Furthermore, change of total corneal refractive power in different corneal pathologies was also evaluated. For IOL power calculation, three fourth-generation IOL formulas were compared (Haigis, SRK-T, and Barrett Universal II). The dataset was then checked against ray-tracing and analyzed to improve prediction error in these highly irregular corneas. Results All patients showed an improvement in visual acuity postoperatively with a mean spherical equivalent of -1.22 ± 0.49 diopters (D). Overall comparison of the three formulas showed the Haigis formula to be superior in terms of the smallest deviation of predictive and absolute error. IOL calculations with ray-tracing were possible in all eyes, but showed inaccurate results with keratometric values of 48.00 D and greater. Conclusions The IC-8 IOL is well suited for patients with lens exchange in highly irregular corneas. The Haigis formula seemed to be the most accurate in the patient group. Ray-tracing confirmed the results of biometric formulas up to a keratometric value of 48.00 D and should be compared with standard biometric formulas to address corneal irregularities and to minimize refractive surprises after surgery. A comparison with ray-tracing in eyes with a keratometric value of greater than 48.00 D should not be considered due to the inaccurate results. [J Refract Surg. 2021;37(5):312-317.].
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