ABSTRACT

Purpose

To evaluate the value of total keratometry (TK) to estimate corneal power in eyes that underwent SMILE for treatment of myopia or myopic astigmatism in subgroups of low and high astigmatism.

Methods

The difference between preoperative and postoperative measurements of corneal power (ΔTCRP, ΔTK) was compared with the surgically induced refractive change at the corneal plane (ΔSE_co) by Pearson correlation. Vector analysis of TCRP- and TK-derived astigmatism was performed to evaluate the corneal astigmatism. Single-angle plots were generated with the AstigMATIC tool for standard astigmatism vector analysis.

Results

Paired t-test revealed statistically significant differences in preoperative (p = .02) and postoperative (p = .0455) measurements between TK and TCRP in the group of high-level astigmatism and the postoperative low astigmatism group (p < .01). No significant differences were found in preoperative data in the group of low-level astigmatism (p = .60). The correlation of ΔSEco and TK (low astigmatism, R² = 0.978; high astigmatism R² = 0.980) was stronger than the correlation of TCRP 4.0 mm and ΔSEco (low astigmatism, R² = 0.743; high astigmatism R² = 0.959) in both astigmatic groups. The vector analysis demonstrated nearly identical results concerning the correction index (CI) for TK and TCRP. Comparing the difference vector (DV) between both parameters, TK-derived results were closer to the optimum.

Conclusions

The findings endorse TK as a reliable measure of corneal power after SMILE in patients with low and high astigmatism.

中文翻译：

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OCT 与基于 Scheimpflug 的总角膜功率测量在近视散光 SMILE 程序中的变化

摘要

目的

评估总角膜曲率 (TK) 的价值，以估计接受 SMILE 治疗低度和高度散光亚组的近视或近视散光的眼睛的角膜屈光力。

方法

通过皮尔逊相关性，将术前和术后角膜屈光力测量值（ΔTCRP，ΔTK）与手术引起的角膜平面屈光变化（ΔSE _{co ）进行比较。}对 TCRP 和 TK 衍生的散光进行矢量分析以评估角膜散光。使用 AstigMATIC 工具生成单角图，用于标准散光矢量分析。

结果

配对t检验显示，高水平散光组和术后低散光组的 TK 和 TCRP 在术前 ( p = .02) 和术后 ( p = .0455) 测量值上有统计学显着差异( p <.01)。低度散光组术前数据无显着差异（p = .60）。ΔSEco和TK（低散光，R ²  = 0.978；高散光R ²  = 0.980）的相关性强于TCRP 4.0 mm和ΔSEco（低散光，R ²  = 0.743；高散光R ² = 0.959）在两个散光组。向量分析表明 TK 和 TCRP 的校正指数 (CI) 的结果几乎相同。比较两个参数之间的差异向量 (DV)，TK 导出的结果更接近最佳值。

结论

该研究结果支持 TK 作为对低度和高度散光患者进行 SMILE 后角膜屈光力的可靠测量。