Olsen T, Corydon L, Gimbel H
Department of Ophthalmology, Aarhus University Hospital, Denmark.
J Cataract Refract Surg. 1995 May;21(3):313-9. doi: 10.1016/s0886-3350(13)80140-x.
The accuracy of intraocular lens (IOL) power calculation was evaluated in a multicenter study of 822 IOL implantations using the Binkhorst II, Sanders/Retzlaff/Kraff (SRK I, SRK II, SRK/T), Holladay, and Olsen formulas. All but the first of these were optimized in retrospect with calculation of the SRK A-constant, the Holladay surgeon factor, and the Olsen pseudophakic anterior chamber depth (ACD) for each lens style. The ACD prediction of the Olsen formula was based on a previously described regression formula incorporating preoperative ACD, corneal height, axial length, and lens thickness. Among the optical IOL power calculation formulas, the highest IOL power prediction error was found with Binkhorst's and the lowest with Olsen's, which was more accurate than the SRK/T and the Holladay formulas (P < .05). The SRK/T formula was significantly more accurate than the original SRK regression formulas (P < .001). When analyzed for axial length dependence, all formulas showed the least error in the normal range. Error of the Olsen formula was lower than that of the others in the axial length interval 20 mm to 26 mm. No differences in accuracy were found between the optical IOL calculation formulas in eyes with an axial length above 26 mm (P < .05). The accuracy of IOL power calculation can be improved with optical formulas using newer-generation ACD-prediction algorithms.
在一项多中心研究中，使用Binkhorst II、Sanders/Retzlaff/Kraff（SRK I、SRK II、SRK/T）、Holladay和Olsen公式，对822例人工晶状体（IOL）植入手术的IOL屈光度计算准确性进行了评估。除第一个公式外，其他公式均通过回顾性计算每个晶状体类型的SRK A常数、Holladay术者因子和Olsen人工晶状体前房深度（ACD）进行了优化。Olsen公式的ACD预测基于先前描述的一个回归公式，该公式纳入了术前ACD、角膜高度、眼轴长度和晶状体厚度。在光学IOL屈光度计算公式中，发现Binkhorst公式的IOL屈光度预测误差最高，而Olsen公式的误差最低，Olsen公式比SRK/T和Holladay公式更准确（P <.05）。SRK/T公式比原始的SRK回归公式显著更准确（P <.001）。在分析对眼轴长度的依赖性时，所有公式在正常范围内显示出最小的误差。在20 mm至26 mm的眼轴长度区间内，Olsen公式的误差低于其他公式。在眼轴长度超过26 mm的眼中，光学IOL计算公式之间在准确性上未发现差异（P <.05）。使用新一代ACD预测算法的光学公式可以提高IOL屈光度计算的准确性。
