Jeyandran Joshua, Roberts Cynthia J, Yuhas Phillip T
College of Optometry, The Ohio State University, Columbus, OH, USA.
Department of Ophthalmology and Visual Sciences, College of Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, USA.
Clin Optom (Auckl). 2025 Sep 5;17:283-296. doi: 10.2147/OPTO.S535433. eCollection 2025.
The purposes of this study were to test the validity of a portable ultrasound biometer (6000 Scanmate-A, DGH Technology) against an optical biometer and to establish its repeatability and reproducibility on patients in sitting and supine positions.
Healthy adults (N = 51) were recruited prospectively. At two study visits, Observer 1 made five measurements of AL and ACD in the right eye using an optical biometer (IOLMaster, Zeiss). Then two sets of three measurements of AL and ACD were made using the Scanmate-A, one while participants were sitting and another while they were supine. Observer 2 made the same measurements at one visit on a subset of participants (n = 42). Averages of the measurements were prepared for analysis (significance threshold set to α = 0.01) according to Bland and Altman, repeated-measures analyses of variance, linear correlations, and intraclass correlation coefficients (ICC).
AL and ACD were significantly shorter when measured by the Scanmate-A (median [interquartile range] = 23.4 [22.5, 24.7] mm and mean ± standard deviation = 3.22 ± 0.45 mm, respectively) than when measured by IOLMaster (23.8 [23.1, 25.2] mm and 3.51 ± 0.33 mm, respectively). For both body positions, there were no differences in ACD and AL between visit 1 and visit 2. Correlations were strong between the visits, but the limits of agreement varied. Similarly, there were no significant differences between Observer 1 and Observer 2. Correlations and ICC were strong-to-moderate between the observers, and the limits of agreement varied.
Consistent with reports on other a-scan devices, the Scanmate-A measured shorter AL and shallower ACD than the IOLMaster. Although, mean or median AL and ACD did not differ across study visits, observers, and body positions, large limits of agreement on Bland-Altman analyses must be accounted for by users of the Scanmate-A.
本研究旨在检验便携式超声生物测量仪（6000 Scanmate - A，DGH Technology公司）相对于光学生物测量仪的有效性，并确定其在患者坐位和仰卧位时的重复性和再现性。
前瞻性招募健康成年人（N = 51）。在两次研究访视中，观察者1使用光学生物测量仪（IOLMaster，蔡司公司）对右眼的眼轴长度（AL）和前房深度（ACD）进行5次测量。然后使用Scanmate - A进行两组各3次AL和ACD测量，一组在参与者坐位时进行，另一组在仰卧位时进行。观察者2在一次访视中对部分参与者（n = 42）进行相同测量。根据布兰德 - 奥特曼分析、重复测量方差分析、线性相关性分析和组内相关系数（ICC），对测量平均值进行分析准备（显著性阈值设定为α = 0.01）。
与IOLMaster测量结果相比，Scanmate - A测量的AL和ACD显著更短（中位数[四分位间距]分别为23.4 [22.5, 24.7] mm和均值±标准差为3.22 ± 0.45 mm）（IOLMaster测量结果分别为23.8 [23.1, 25.2] mm和3.51 ± 0.33 mm）。对于两种体位，访视1和访视2之间的ACD和AL均无差异。访视之间相关性较强，但一致性界限有所不同。同样，观察者1和观察者2之间无显著差异。观察者之间的相关性和ICC为中等到强，一致性界限有所不同。
与其他A超设备的报告一致，Scanmate - A测量的AL比IOLMaster短，ACD比IOLMaster浅。尽管在研究访视、观察者和体位之间，AL和ACD的均值或中位数没有差异，但Scanmate - A的使用者必须考虑布兰德 - 奥特曼分析中较大的一致性界限。
