C constant: New concept for ray tracing-assisted intraocular lens power calculation
C constant: New concept for ray tracing-assisted intraocular lens power calculation
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DOI：
10.1016/j.jcrs.2013.10.037
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发表时间：
2014-05-01
影响因子：
2.8
通讯作者：
Hoffmann, Peter
中科院分区：
文献类型：
--
作者：
Olsen, Thomas;Hoffmann, Peter
PURPOSE: To evaluate the accuracy of the C constant for ray tracing-assisted intraocular lens (IOL) power calculation.DESIGN: Case series.SETTING: Public university hospital and private clinic.METHODS: Preoperatively, all intraocular distances were measured using laser biometry. Various IOL designs were studied; powers ranged from -5.0 diopters (D) to +38.0 D. The IOL power calculation was performed with the Olsen formula using the C constant and compared with the Haigis, Hoffer Q, Holladay 1, and the SRK/T formulas on optimized datasets. Outcome measures were the error of the prediction, expressed as the arithmetic error, and the absolute error between the observed refraction and the predicted refraction.RESULTS: Two thousand forty-three cases from the 2 centers were studied. No significant differences were found between the Haigis, Hoffer Q, Holladay 1, and SRK/T formulas with the exception of the SRK/T formula, which performed better than the other thin-lens formulas in eyes with an axial length (AL) greater than 27.0 mm (P1.0 D) for the 2 series, respectively (P
