Stability of the Barrett True-K formula for intraocular lens power calculation after SMILE in Chinese myopic eyes
Stability of the Barrett True-K formula for intraocular lens power calculation after SMILE in Chinese myopic eyes
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DOI：
10.18240/ijo.2020.04.05
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发表时间：
2020-04-18
影响因子：
1.4
通讯作者：
Song, Yan-Zheng
中科院分区：
文献类型：
--
作者：
Zhu, Wei;Zhang, Feng-Ju;Song, Yan-Zheng
目的：将 Barrett True-K 公式与 Lensstar 900 中集成的其他公式进行比较，以预测小切口晶状体摘除 (SMILE) 后的人工晶状体 (IOL) 屈光度。方法：进行理论前瞻性研究，使用 SRK/T（Sanders、Retzlaff、Kraff/理论）、Holladay 1、Haigis 和 Barrett True-K 公式预测 SMILE 前后等效 IOL 屈光力的比率并比较他们预测的稳定性。该研究包括 54 只眼睛（54 例），明显屈光球当量 (MRSE) 为 -4.99 +/- 1.45 D。将其分为两组：A 组 27 只眼，眼轴长度为 24-26 mm，B 组 27 只眼轴长度 >26 mm。所有参加本研究的受试者在 SMILE 前和 SMILE 后 6 个月均使用 Lenstar 900 检查，包括测量眼轴、角膜结果：Barrett True-K 公式对两组等效 IOL 屈光力的预测更加稳定，尤其是长眼轴眼（B 组）。 SRK/T、Holladay 1、Haigis 和 Barrett True-K 公式的百分比分别为 7.4%、7.4%、85.19% 和 88.89%，误差范围在 0.5 D 以内； A组误差幅度在1.0D以内为25.92%、51.84%、100%和100%；误差幅度在 0.5 D 以内时分别为 33.33%、40.74%、44.44% 和 81.48%； B 组中 1.0 D 以内的误差范围为 44.44%、59.26%、66.66% 和 92.59%。B 组中 2.0 D 范围内的 Barrett True-K 公式的相应百分比为 100%。结论：理论上，Barrett True-K 公式比其他公式对白内障眼术后提供了更稳定的预测。微笑。
AIM: To compare the Barrett True-K formula with other formulas integrated in Lenstar 900 to predict intraocular lens (IOL) power after small-incision lenticule extraction (SMILE).METHODS: A theoretical prospective study was performed to predict the ratio of equivalent IOL power before and after SMILE using the SRK/T (Sanders, Retzlaff, Kraff/ theoretical), Holladay 1, Haigis, and Barrett True-K formulas and compare the stability of their predictions. The study included 54 eyes (54 cases) with a manifest refraction spherical equivalent (MRSE) of -4.99 +/- 1.45 D. They were divided into two groups: 27 eyes with axial length of 24-26 mm in Group A, and 27 eyes with axial length >26 mm in Group B. All subjects enrolled in this study were examined with the Lenstar 900 before and 6mo after SMILE including measurements of axial length, corneal curvature, and anterior chamber depth (ACD).RESULTS: The prediction of equivalent IOL power of the two groups was more stable for the Barrett True-K formula, especially in long axial length eyes (Group B). The respective percentages for the SRK/T, Holladay 1, Haigis, and Barrett True-K formulas were 7.4%, 7.4%, 85.19%, and 88.89% for a margin of error within 0.5 D; 25.92%, 51.84%, 100%, and 100% for a margin of error within 1.0 D in Group A; 33.33%, 40.74%, 44.44%, and 81.48% for a margin of error within 0.5 D; and 44.44%, 59.26%, 66.66%, and 92.59% for a margin of error within 1.0 D in Group B. The respective percentages for Barrett True-K formulas were 100% for a margin of error within 2.0 D in Group B.CONCLUSION: Theoretically, the Barrett True-K formula provides more stable predictions than other formulas for cataract eyes after SMILE.