University Eye Clinic, Aarhus Hospital NBG, Aarhus, Denmark.
Ophthalmology. 2011 Sep;118(9):1710-5. doi: 10.1016/j.ophtha.2011.04.030. Epub 2011 Jul 2.
To test the hypothesis that the refractive outcome of the first eye can be used to improve the intraocular lens (IOL) power calculation for the second eye.
Retrospective, consecutive case series in a university clinic setting.
One thousand two hundred thirty-five patients who underwent sequential bilateral IOL implantation using the same type of IOL for both eyes.
The refractive outcome was analyzed in retrospect and the IOL power calculation was reviewed using 3 different methods: (1) the old Sanders-Retzlaff-Kraff (SRK) II formula, (2) the newer SRK/T formula, and (3) the more recent Olsen formula. In a subgroup of 232 eyes, the actual postoperative anterior chamber depth (ACD) was measured using the Lenstar LS900 laser biometer (Haag-Streit AG, Koeniz, Switzerland).
The error in diopters (D) of the predicted refraction in the spectacle plane.
The correlation coefficients between the prediction errors for the right and left eyes were 0.56, 0.38, and 0.27 for the SRK II, SRK/T, and Olsen formula, respectively (P<0.001). Based on the observed correlation, the prediction of the second eye could be corrected according to the regression formula: Rx(cor) = Rx(exp)+β×Px(err), where Rx(cor) and Rx(exp) are the corrected and the uncorrected refractive prediction, respectively, Px(err) is the observed error of the first eye, and β is a formula-specific regression coefficient. Using this formula, the mean absolute error (MAE) was found to decrease from 0.56 D to 0.46 D, from 0.47 D to 0.41 D, and from 0.42 D to 0.40 D with the SRK II (P<0.001), the SRK/T (P<0.001), and the Olsen formula (P<0.05), respectively. Substituting the measured postoperative ACD of the first eye for the estimated ACD for the second eye in the Olsen formula was found to have a similar accuracy as the empirical regression formula.
Depending on the IOL power calculation formula, the prediction error of the first eye may be used to improve the prediction for the second eye. The reason for this effect seems to be the formula-dependent inaccuracy in the prediction of the IOL position (ACD) after surgery.
检验以下假设，即第一只眼的屈光结果可用于改进第二只眼的人工晶状体（IOL）屈光力计算。
在大学诊所环境中进行回顾性、连续病例系列研究。
1235 名连续接受双侧 IOL 植入术的患者，双眼均使用相同类型的 IOL。
回顾性分析屈光结果，并使用 3 种不同方法（1）旧的桑德斯-雷茨拉夫-克拉夫（SRK）II 公式，（2）新的 SRK/T 公式，和（3）最近的奥尔森公式，对 IOL 屈光力计算进行回顾。在 232 只眼中的一个亚组中，使用 Lenstar LS900 激光生物测量仪（Haag-Streit AG，Koeniz，瑞士）实际测量术后前房深度（ACD）。
在眼镜平面预测折射的屈光度误差。
右眼和左眼预测误差之间的相关系数分别为 0.56、0.38 和 0.27，用于 SRK II、SRK/T 和奥尔森公式（P<0.001）。根据观察到的相关性，可以根据回归公式校正第二只眼的预测：Rx(cor)=Rx(exp)+β×Px(err)，其中 Rx(cor)和 Rx(exp)分别为校正和未校正的屈光预测值，Px(err)为第一只眼的观察误差，β为公式特定的回归系数。使用此公式，平均绝对误差（MAE）从 0.56 D 降至 0.46 D、从 0.47 D 降至 0.41 D、从 0.42 D 降至 0.40 D，分别对应于 SRK II（P<0.001）、SRK/T（P<0.001）和奥尔森公式（P<0.05）。在奥尔森公式中，用第一只眼的术后实际 ACD 替代估计的第二只眼 ACD，结果与经验回归公式的准确性相当。
根据 IOL 屈光力计算公式的不同，第一只眼的预测误差可用于改进第二只眼的预测。这种效果的原因似乎是手术中术后 IOL 位置（ACD）预测的公式相关不准确。
