Kim Moonjung, Han Eui S
Department of Ophthalmology, Sheikh Khalifa Specialty Hospital, Ras Al Khaimah, United Arab Emirates.
Department of Ophthalmology, Seoul National University Hospital, Seoul, Korea.
Saudi J Ophthalmol. 2022 Aug 29;36(2):189-194. doi: 10.4103/sjopt.sjopt_50_21. eCollection 2022 Apr-Jun.
The purpose of the study was to evaluate the agreement between measurements by optical low-coherence interferometry (OLCI, Aladdin) and those by Scheimpflug imaging combined with partial coherence interferometry (Scheimpflug-PCI, Pentacam AXL) in cataract patients.
This was a retrospective comparative study conducted in the United Arab Emirates. Axial length (AL), corneal power (keratometry, K), anterior chamber depth (ACD), and corneal astigmatism in patients with cataracts were measured with both devices. Difference and correlation were evaluated with paired -test (p) and Pearson's correlation coefficient, respectively.
A total of 164 eyes of 95 patients were analyzed (164 eyes for K, 155 for ACD, and 112 for AL). The mean AL taken by OLCI was longer than that by Scheimpflug-PCI (23.25 mm vs. 23.23 mm, ≤ 0.0001), showing an excellent correlation between the two ( = 0.9990). ACD measured by OLCI was 0.08 mm shallower than that by Scheimpflug-PCI ( = 0.0003, = 0.7386). Corneal power measured by OLCI was lower than that by Scheimpflug-PCI (differences in mean K, flat K, and steep K were 0.05 diopters (D), 0.08 D, and 0.02 D, respectively), showing very strong correlations between the two devices ( = 0.9614, 0.9445, and 0.9535, respectively). Only flat K values measured with the two devices were significantly different ( = 0.0428). There were no statistically significant differences in the magnitude of astigmatism or J45 vector between the two devices ( = 0.1441 and = 0.4147, respectively). However, J0 vector values were significantly different ( = 0.0087).
Although OCLI and Scheimpflug-PCI showed strong correlations for measurements of AL, K, ACD, and corneal astigmatism in cataract patients, there were small but statistically significant differences in AL, ACD, flat K, and J0 vector. Thus, these two devices are not interchangeable for calculating intraocular lens power.
本研究旨在评估光学低相干干涉测量法（OLCI，阿拉丁）与Scheimpflug成像联合部分相干干涉测量法（Scheimpflug-PCI，Pentacam AXL）在白内障患者测量结果之间的一致性。
这是一项在阿拉伯联合酋长国进行的回顾性比较研究。使用这两种设备测量白内障患者的眼轴长度（AL）、角膜屈光力（角膜曲率计，K）、前房深度（ACD）和角膜散光。分别采用配对t检验（p）和Pearson相关系数评估差异和相关性。
共分析了95例患者的164只眼（K测量164只眼，ACD测量155只眼，AL测量112只眼）。OLCI测量的平均AL比Scheimpflug-PCI测量的长（23.25mm对23.23mm，p≤0.0001），两者之间显示出极好的相关性（r = 0.9990）。OLCI测量的ACD比Scheimpflug-PCI测量的浅0.08mm（p = 0.0003，r = 0.7386）。OLCI测量的角膜屈光力低于Scheimpflug-PCI测量的（平均K、平K和陡K的差异分别为0.05屈光度（D）、0.08D和0.02D），两种设备之间显示出很强的相关性（分别为r = 0.9614、0.9445和0.9535）。仅两种设备测量的平K值有显著差异（p = 0.0428）。两种设备之间散光量或J45向量无统计学显著差异（分别为p = 0.1441和p = 0.4147）。然而，J0向量值有显著差异（p = 0.0087）。
尽管OCLI和Scheimpflug-PCI在白内障患者的AL、K、ACD和角膜散光测量方面显示出很强的相关性，但在AL、ACD、平K和J0向量方面存在微小但具有统计学意义的差异。因此，这两种设备在计算人工晶状体屈光力时不可互换。
