Application of Pentacam TNP in calculating the intraocular lens power after corneal refractive surgery
10.3980/j.issn.1672-5123.2024.4.28
- VernacularTitle:Pentacam TNP在角膜屈光手术后人工晶状体度数计算中的应用研究
- Author:
Xinyi ZANG
1
;
Shilan MAO
1
;
Jin XIE
1
;
Xiaomin LIU
1
;
Dewei LI
1
;
Jing YUAN
1
;
Yunhai DAI
1
Author Information
1. Shandong Second Medical University, Weifang 261053, Shandong Province, China
- Publication Type:Journal Article
- Keywords:
cataract;
true net power(TNP);
SRK/T;
prediction errors
- From:
International Eye Science
2024;24(4):646-650
- CountryChina
- Language:Chinese
-
Abstract:
AIM: To assess the accuracy of predicting intraocular lens(IOL)power after myopic refractive surgery using the Pentacam system's true net power(TNP)in the 3 mm zone combined with the SRK/T formula [i.e. TNP 3 mm(SRK/T)].METHODS: Retrospective study. This study enrolled 35 cases(50 eyes)of patients undergoing cataract surgery after laser assisted in situ keratomileusis(LASIK)or photorefractive keratectomy(PRK)from July 2019 to December 2021. Preoperatively, IOL power of 50 eyes, 34 eyes and 41 eyes was calculated by TNP 3 mm(SRK/T), Barrett True-K and Olsen 2 formulas, respectively, with at least 2 formulas used to calculate IOL power for each patient. The actual diopter was recorded 3 mo postoperatively. Prediction errors(PE)of IOL power were compared among the three calculation methods, and the proportion of eyes with PE within ±0.5 D and ±1.0 D was analyzed.RESULTS: The PE at 3 mo postoperatively for TNP 3 mm(SRK/T), Barrett True-K, and Olsen 2 was -0.02±0.63, -0.54±0.80, and 0.25±0.80 D, respectively(P<0.001). The proportions of PE within ±0.5 D were 66%(33/50), 44%(15/34)and 37%(15/41), respectively(P<0.05); the proportions of PE within ±1.0 D were 88%(44/50), 71%(24/34)and 80%(33/41), respectively(P>0.05).CONCLUSION: The Pentacam TNP 3 mm(SRK/T)method is simple to operate and provides accurate calculation of IOL power after corneal refractive surgery.
