Department of Ophthalmology, Chang Gung Memorial Hospital, Linkou Medical Center, No. 5, Fuxing Street, Guishan District, Taoyuan, 33305, Taiwan, ROC.
Department of Medicine, College of Medicine, Chang Gung University, Taoyuan, Taiwan.
Sci Rep. 2022 Mar 11;12(1):4305. doi: 10.1038/s41598-022-08253-6.
The studies for astigmatism prediction error at different diameters using optical biometry are scant. We investigated patients who underwent cataract surgery with monofocal, nontoric intraocular lens (IOL) from 2017 through 2019 in a medical center. Patients with prior refractive surgeries, corneal opacity, or surgical complications were excluded. Corneal astigmatism (CA) was measured using AL-Scan at 2.4- and 3.3-mm diameter zones and calculated using the Barrett toric calculator preoperatively and postoperatively. The mean absolute error and centroid prediction error for the two zones were computed using double-angle plots. In total, 101 eyes of 76 patients were analyzed. Mean patient age was 68.7 ± 9.3 years and mean preoperative CA power was 0.7 ± 0.5 D. The overall centroid prediction error a 3.3 mm (0.09 ± 0.58 D@25) was significantly lower than that at 2.4 mm (0.09 ± 0.68 D@87) on the X-axis (P = 0.003). The 3.3-mm measurement also had a lower centroid prediction error than the 2.4-mm did for eyes with against-the-rule (ATR) and oblique astigmatism (P = 0.024; 0.002 on X-axis, respectively). The 3.3-mm measurement provided a more accurate CA estimation than the 2.4-mm did, particularly for ATR astigmatism. Diameter zone and astigmatism type should be considered crucial to precise astigmatism calculation.
使用光学生物测量法预测不同直径散光预测误差的研究较少。我们调查了 2017 年至 2019 年在一家医疗中心接受单焦点、非散光人工晶状体（IOL）白内障手术的患者。排除了有屈光手术、角膜混浊或手术并发症的患者。使用 AL-Scan 在 2.4 和 3.3 毫米直径区域测量角膜散光（CA），并在术前和术后使用 Barrett 散光计算器计算。使用双角度图计算两个区域的平均绝对误差和质心预测误差。共分析了 76 例 101 只眼。患者平均年龄为 68.7±9.3 岁，平均术前 CA 力为 0.7±0.5 D。3.3 毫米的整体质心预测误差（0.09±0.58 D@25）明显低于 2.4 毫米的（0.09±0.68 D@87），在 X 轴上（P=0.003）。3.3 毫米的测量对于逆规散光（ATR）和斜散光（P=0.024；X 轴上分别为 0.002）的眼，其质心预测误差也低于 2.4 毫米。3.3 毫米的测量比 2.4 毫米更能准确地估计 CA，尤其是对于 ATR 散光。直径区域和散光类型应该被认为是精确散光计算的关键。
