泪膜稳定性对角膜屈光力测量及白内障手术规划的影响
Impact of tear film stability on corneal refractive power measurement and surgical planning for cataract.
作者信息
Jiang Yuanfeng, Chen Xiteng, Gao Yichen, Gao Nan, Wang Huiyu, Feng Yanwen, Li Meisa, Qin Luning, Li Fei, Zhao Shaozhen, Bu Shaochong, Tian Fang
机构信息
Tianjin Key Laboratory of Retinal Functions and Diseases, Tianjin Branch of National Clinical Research Center for Ocular Disease, Eye Institute and School of Optometry, Tianjin Medical University Eye Hospital, Tianjin, China.
出版信息
Adv Ophthalmol Pract Res. 2025 Feb 3;5(2):100-106. doi: 10.1016/j.aopr.2025.02.001. eCollection 2025 May-Jun.
PURPOSE
This prospective cohort study aimed to assess the influence of tear film stability on corneal refractive power measurement and surgical planning in cataract patients.
METHODS
Participants were divided into tear film instability (tear film stability level 2) and control (level 0-1) groups based on Keratograph 5M results. Using IOL Master 700, two consecutive measurements were obtained with a 10-min interval. Parameters including standard keratometry (Kf, Ks and K), keratometric corneal astigmatism (KCA), total keratometry (TKf, TKs and TK) and total corneal astigmatism (TCA) were recorded. IOL power was calculated using SRK-T, SRK-T TK, Haigis, Haigis TK, Barrett Universal II, and Barrett Universal II TK formulas.
RESULTS
The results showed significantly higher differences between two measurements in Kf, K, KCA, TKf, TK, and TCA, as well as the vector variability of corneal astigmatism in the tear film instability group (all < 0.05). Of all formulas, only the SRK-T formula displayed significantly higher variability in IOL power calculations in the tear film instability group compared to the control group ( < 0.05).
CONCLUSIONS
This study highlights that tear film instability can lead to deviations in corneal refractive power and astigmatism measurements, contributing to increased prediction errors in IOL power calculation, particularly with the SRK-T formula.
目的
这项前瞻性队列研究旨在评估泪膜稳定性对白内障患者角膜屈光力测量及手术规划的影响。
方法
根据角膜地形图仪5M的结果，将参与者分为泪膜不稳定组（泪膜稳定性等级为2）和对照组（等级为0 - 1）。使用IOL Master 700，每隔10分钟进行连续两次测量。记录包括标准角膜曲率计测量值（Kf、Ks和K）、角膜曲率性散光（KCA）、总角膜曲率（TKf、TKs和TK）以及总角膜散光（TCA）等参数。使用SRK - T、SRK - T TK、Haigis、Haigis TK、Barrett Universal II和Barrett Universal II TK公式计算人工晶状体度数。
结果
结果显示，泪膜不稳定组两次测量之间在Kf、K、KCA、TKf、TK和TCA方面的差异显著更高，以及角膜散光的矢量变异性也更高（均P < 0.05）。在所有公式中，与对照组相比，泪膜不稳定组中只有SRK - T公式在人工晶状体度数计算中显示出显著更高的变异性（P < 0.05）。
结论
本研究强调泪膜不稳定可导致角膜屈光力和散光测量出现偏差，从而增加人工晶状体度数计算中的预测误差，尤其是使用SRK - T公式时。
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