Zarei-Ghanavati Siamak, Saber Moghaddam Mahtab, Bakhtiari Elham, Shirzad Sina, Sadeghi Javad, Motamed Shariati Mehrdad
Eye Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
J Curr Ophthalmol. 2025 Jun 5;36(3):272-278. doi: 10.4103/joco.joco_152_24. eCollection 2024 Jul-Sep.
To evaluate the agreement between topographical and tomographic measurements of the cornea with three methods of Placido-disc, Scheimpflug, and optical coherence tomography in normal eyes with myopic refractive error candidate for keratorefractive surgery.
Subjects within the age range of 18-55 years old candidates for keratorefractive surgery with no history of systemic disorder, eye diseases except refractive errors, and ocular surgery were enrolled in the study. The intraclass correlation coefficient and Bland-Altman diagrams evaluated the agreement between different devices.
In this study, 97 subjects, including 35 men and 62 women, participated. There was a statistically significant agreement between the three corneal imaging devices' keratometry measures. Bland-Altman plots show a mean difference of 0.5 diopter (D) for mean anterior keratometry, and 95% limits of agreement reached the value ± 1.00 D for mean anterior astigmatism. Evaluation of the elevation maps showed that the central and maximum elevation of the cornea's anterior and posterior surfaces with Pentacam and Optopol have poor agreement.
Despite an excellent statistical agreement, the differences in the anterior keratometry values may not be clinically acceptable.
采用Placido盘、Scheimpflug和光学相干断层扫描三种方法，评估角膜地形图测量与断层扫描测量在有近视屈光不正且适合角膜屈光手术的正常眼中的一致性。
年龄在18 - 55岁之间、有角膜屈光手术指征、无全身疾病史、无除屈光不正外的眼部疾病及眼部手术史的受试者纳入本研究。组内相关系数和Bland - Altman图用于评估不同设备之间的一致性。
本研究共纳入97名受试者，其中男性35名，女性62名。三种角膜成像设备的角膜曲率测量结果之间存在统计学上的显著一致性。Bland - Altman图显示，平均前角膜曲率的平均差异为0.5屈光度（D），平均前散光的95%一致性界限达到±1.00 D。对高度图的评估表明，Pentacam和Optopol测量的角膜前、后表面的中央和最大高度一致性较差。
尽管在统计学上有良好的一致性，但前角膜曲率值的差异在临床上可能无法接受。
