Yan Chenxi, Yao Ke
From the Eye Center (C.Y., K.Y.) of the 2nd Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China.
From the Eye Center (C.Y., K.Y.) of the 2nd Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang Province, China.
Am J Ophthalmol. 2022 Jan;233:57-67. doi: 10.1016/j.ajo.2021.07.011. Epub 2021 Jul 20.
To explore the impact of preoperative lens vault (LV) on the accuracy of the Barrett Universal Ⅱ, Haigis, Hoffer Q, Hoffer QST, Holladay 1, Kane, and SRK/T formulas in eyes with a shallow anterior chamber.
Retrospective case series.
Included were 409 eyes with anterior chamber depth (ACD) shallower than 3.0 mm that underwent phacoemulsification. Eyes were divided into a short axial length (AL) group (<22.00 mm) and a normal AL group (22.00 ≤ AL < 24.50 mm). Each group was further divided into a small LV subgroup (LV <0.95 mm) and a large LV subgroup (LV ≥0.95 mm) according to the median of the preoperative LV. Postoperative refraction was measured 3 months after surgery. Mean absolute error (MAE) was calculated and compared for each formula. The correlation between LV and the mean numeric error predicted by each formula was analyzed.
Overall, the Barrett and Kane formulas generated the smallest MAE in both short AL and normal AL groups (P < .05 for both). In short AL eyes with small LV, the Haigis formula performed better than other traditional formulas (P < .05 for all). In normal AL eyes with a small LV, the Barrett and Kane formulas showed higher accuracy (P < .05 for all), and other formulas were comparable. In either subgroup with a large LV, the Haigis formula created a significant higher MAE (P < .001 for all), followed by Hoffer QST. Positive correlations were found between LV and mean numeric errors predicted by all formulas, except for Barrett and Kane formulas (P < .001 for all), indicating a postoperative hyperopic shift with an increased LV.
In shallow anterior chamber eyes with a large LV, the Haigis and Hoffer QST formulas taking preoperative ACD into calculation surprisingly showed a larger prediction error. However, the Barrett and the Kane formulas, which include both ACD and lens thickness as predictive parameters, showed good accuracy in both small and large LV subgroups. Therefore, although formulas referring to preoperative ACD are generally believed to achieve better refractive results in patients with a shallow anterior chamber, LV may be valuable to consider when choosing an IOL power calculation formula.
探讨术前晶状体拱高（LV）对前房浅的眼睛中Barrett Universal Ⅱ、Haigis、Hoffer Q、Hoffer QST、Holladay 1、Kane和SRK/T公式准确性的影响。
回顾性病例系列研究。
纳入409只前房深度（ACD）小于3.0mm且接受了超声乳化手术的眼睛。将眼睛分为短眼轴长度（AL）组（<22.00mm）和正常AL组（22.00≤AL<24.50mm）。根据术前LV的中位数，每组进一步分为小LV亚组（LV<0.95mm）和大LV亚组（LV≥0.95mm）。术后3个月测量屈光状态。计算每个公式的平均绝对误差（MAE）并进行比较。分析LV与每个公式预测的平均数值误差之间的相关性。
总体而言，Barrett和Kane公式在短AL组和正常AL组中产生的MAE最小（两者P均<.05）。在短AL且LV小的眼睛中，Haigis公式比其他传统公式表现更好（所有P<.05）。在正常AL且LV小的眼睛中，Barrett和Kane公式显示出更高的准确性（所有P<.05），其他公式相当。在任何一个LV大的亚组中，Haigis公式产生的MAE显著更高（所有P<.001），其次是Hoffer QST。除了Barrett和Kane公式外，在LV与所有公式预测的平均数值误差之间发现正相关（所有P<.00
