Comparison of total corneal power measurements obtained with different devices after myopic keratorefractive surgery

• Published in: International journal of ophthalmology 2023-07, Vol.16 (7), p.1117-1122
• Main Authors: Wang, Zi-Yang, Song, Yan-Zheng, Yang, Wen-Li, Liu, Qian, Li, Yi-Feng, Cui, Rui, Shen, Lin, Zhai, Chang-Bin
• Format: Article
• Language: English
• Subjects: Clinical Research; corneal power; keratorefractive surgery; total keratometry
• ISSN: 2222-3959; 2227-4898
• DOI: 10.18240/ijo.2023.07.17

To analyze the differences, agreements, and correlation among total corneal power parameters generated by different instruments after myopic keratorefractive surgery. The prospective cross-sectional study included patients who underwent myopic keratorefractive surgery and received measurements of corneal power 3mo after surgery. Automated keratometer was used for the measurement of simulated keratometry (SimK), swept-source optical coherence tomography (SS-OCT) based biometer for total keratometry (TK), anterior segment-OCT for real keratometry (RK), and Scheimpflug keratometer for the true net power (TNP), the total corneal refractive power (TCRP) and equivalent K-readings (EKR). The differences among these parameters were analyzed, and the agreements and correlation between SimK and other total corneal power parameters were investigated. A total of 70 eyes of 70 patients after myopic keratorefractive surgery were included. The evaluated corneal power parameters were as follows: SimK 38.32±1.93 D, TK 37.54±2.12 D, RK 36.64±2.09 D, TNP 36.56±1.97 D, TCRP 36.70±2.01 D, and EKR 37.55±2.00 D. Pairwise comparison showed that there were significant differences (