Xu Yanxin, Liu Liangping, Li Jianbing, Cheng Huanhuan, Qin Yingyan, Mao Yan, Wu Mingxing
State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China.
Curr Eye Res. 2021 Sep;46(9):1333-1340. doi: 10.1080/02713683.2021.1887271. Epub 2021 Mar 5.
To compare the differences in refractive outcome and anterior chamber depth (ACD) after phacoemulsification between eyes with and without previous pars plana vitrectomy (PPV). Patients who had significant cataracts after PPV were included in the study group, and patients with a matched axial length (AL) who had cataracts without PPV were selected as the control group. The performance of new generation intraocular lens (IOL) power calculation formulas (Barrett Universal II, Kane, Ladas Super formulas), and the traditional formulas (SRK/T, Holladay 1, Hoffer Q, Haigis) with and without the Wang-Koch (WK) AL adjustment were compared between the two groups. The postoperative ACD was measured using the Scheimpflug imaging system with manual correction at least three months after surgery. In total, there were 193 eyes from 193 patients in each group. The mean prediction errors (MEs) of the new generation formulas had no significant systemic bias in the study group; the hyperopic shift was displayed in the traditional formulas for eyes with AL > 26mm. However, the difference of MEs between the two groups among all the formulas were not significant. The absolute prediction error (MAE) and median prediction error (Med AE) in the study group were larger than those in the control group among all the formulas. The postoperative ACD of the study group was deeper but not significant than that of the control group. There was no refractive shift in vitrectomized eyes compared with non-vitrectomized eyes no matter in new generation formulas or traditional vergence formulas. The prediction error among all the formulas in vitrectomized eyes were significantly higher than those in non-vitrectomized eyes. The ACD after phacoemulsification in vitrectomized eyes was not significantly different from non-vitrectomized eyes.
比较有或无前部玻璃体切割术（PPV）的眼睛在白内障超声乳化术后屈光结果和前房深度（ACD）的差异。将PPV术后患有明显白内障的患者纳入研究组，选择眼轴长度（AL）匹配且无PPV的白内障患者作为对照组。比较两组中使用和不使用王-科赫（WK）AL调整的新一代人工晶状体（IOL）屈光力计算公式（巴雷特通用二代、凯恩、拉达斯超级公式）以及传统公式（SRK/T、霍拉迪1、霍弗Q、海吉斯）的性能。术后至少三个月使用带有手动校正的Scheimpflug成像系统测量ACD。每组共有来自193例患者的193只眼。新一代公式的平均预测误差（MEs）在研究组中无明显系统性偏差；对于AL>26mm的眼睛，传统公式显示有远视偏移。然而，所有公式在两组之间的MEs差异均无统计学意义。在所有公式中，研究组的绝对预测误差（MAE）和中位数预测误差（Med AE）均大于对照组。研究组的术后ACD比对照组深，但差异无统计学意义。无论在新一代公式还是传统的屈光公式中，玻璃体切割术的眼睛与未进行玻璃体切割术的眼睛相比均无屈光偏移。玻璃体切割术的眼睛中所有公式的预测误差均显著高于未进行玻璃体切割术的眼睛。玻璃体切割术的眼睛在白内障超声乳化术后的ACD与未进行玻璃体切割术的眼睛无显著差异。
