Salouti Ramin, Nowroozzadeh Mohammad H, Zamani Mohammad, Ghoreyshi Maryam, Salouti Rosa
Poostchi Ophthalmology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran.
Optometry. 2010 Jan;81(1):35-9. doi: 10.1016/j.optm.2009.04.100.
Anterior chamber depth measurement is used frequently in cataract and refractive surgery for advanced intraocular lens (IOL) power calculation formulas and implantation of phakic IOLs. In this article, we show agreement in anterior chamber depth measurements in normal eyes among 3 noncontact systems, namely Galilei, HR Pentacam, and Orbscan II.
The anterior chamber depth measurements were obtained with Galilei, HR Pentacam, and the Orbscan II in both eyes of 37 healthy subjects. Pearson's correlations were calculated, and mean anterior chamber depth measurements were compared. Bland-Altman plots were used to assess the difference between individual measurements for each patient.
The mean anterior chamber depth readings (+/- standard error of means) with Galilei, Pentacam, and Orbscan were 3.22 +/- 0.05, 3.25 +/- 0.05, and 3.54 +/- 0.07, respectively. The difference between Galilei and Pentacam was not statistically significant (P = 0.013). However, Orbscan measurements were larger than those of either Galilei or Pentacam (P < 0.001). The differences between Orbscan and either Galilei or Pentacam were increased with greater anterior chamber depths. The 95% limits of agreement between Orbscan and Galilei, Orbscan and Pentacam, and Pentacam and Galilei in different ranges of chamber depth were ([ < 3 mm, -0.43 to +0.71 mm]; [3 to 3.5 mm, -0.23 to +0.83]; [ > 3.5 mm, +0.41 to +0.53]), ([ < 3 mm, -0.43 to +0.71 mm]; [3 to 3.5 mm, -0.26 to +0.80]; [ > 3.5 mm, +0.38 to +0.54]), and ([ < 3 mm, -0.05 to +0.06 mm]; [3 to 3.5 mm, -0.06 to +0.10]; [ > 3.5 mm, -0.11 to +0.12]), respectively.
These data indicate that in the assessment of normal eyes, Orbscan gives consistently higher measurements for anterior chamber depth compared with Galilei and Pentacam. Because the differences between Orbscan and either Galilei or Pentacam were not within clinically acceptable levels, they are not interchangeable in every clinical situation. However, the differences among anterior chamber depth values measured with Galilei and Pentacam were within clinically acceptable levels. Thus, these 2 systems can be regarded as interchangeable.
前房深度测量在白内障和屈光手术中经常用于先进的人工晶状体（IOL）屈光力计算公式及有晶状体眼人工晶状体的植入。在本文中，我们展示了3种非接触系统，即伽利略（Galilei）、HR Pentacam和Orbscan II在正常眼的前房深度测量结果的一致性。
对37名健康受试者的双眼使用伽利略、HR Pentacam和Orbscan II进行前房深度测量。计算皮尔逊相关性，并比较平均前房深度测量值。使用布兰德-奥特曼图评估每位患者个体测量值之间的差异。
伽利略、Pentacam和Orbscan的平均前房深度读数（±均值标准误差）分别为3.22±0.05、3.25±0.05和3.54±0.07。伽利略和Pentacam之间的差异无统计学意义（P = 0.013）。然而，Orbscan的测量值大于伽利略或Pentacam的测量值（P < 0.001）。Orbscan与伽利略或Pentacam之间的差异随着前房深度增加而增大。在不同前房深度范围内，Orbscan与伽利略、Orbscan与Pentacam以及Pentacam与伽利略之间的95%一致性界限分别为（[<3mm，-0.43至+0.71mm]；[3至3.5mm，-0.23至+0.83]；[>3.5mm，+0.41至+0.53]），（[<3mm，-0.43至+0.71mm]；[3至3.5mm，-0.26至+0.80]；[>3.5mm，+0.38至+0.54]），以及（[<3mm，-0.05至+0.06mm]；[3至3.5mm，-0.06至+0.10]；[>3.5mm，-0.11至+0.12]）。
这些数据表明，在评估正常眼时，与伽利略和Pentacam相比，Orbscan测量的前房深度始终较高。由于Orbscan与伽利略或Pentacam之间的差异不在临床可接受范围内，它们在每种临床情况下不可互换。然而，伽利略和Pentacam测量的前房深度值之间的差异在临床可接受范围内。因此，这两种系统可视为可互换的。
