Ashena Zahra, Gallagher Sean, Naveed Hasan, Spalton David J, Nanavaty Mayank A
Sussex Eye Hospital, University Hospitals Sussex NHS Foundation Trust, Brighton BN2 5BF, UK.
Maidstone Hospital, Maidstone and Tunbridge Wells NHS Trust, Maidstone TN2 4QJ, UK.
Vision (Basel). 2022 Mar 18;6(1):18. doi: 10.3390/vision6010018.
This study aimed to assess the anterior corneal wavefront aberrations, keratometry, astigmatism vectors and pupil size between Pentacam HR® (Oculus Optikgeraete GmbH, Wetzlar, Germany) and iTrace® (Tracey Technologies Corp., Houston, TX, USA). In this observational study, 100 eyes (50 healthy volunteers) were scanned in mesopic light condition with a Pentacam HR® and iTrace®. Anterior corneal aberrations (spherical aberration (Z40), vertical coma (Z3 − 1), horizontal coma (Z3 + 1)), keratometry in the flattest (K1) and steepest meridian (K2), mean astigmatism, astigmatic vectors (J0 and J45), and pupil size were measured. We found a significant difference in Z40 (Pentacam®: +0.30 ± 0.11 µm and iTrace®: −0.03 µm ± 0.05 µm; p < 0.01) with no correlation between the devices (r = −0.12, p = 0.22). The devices were in complete agreement for Z3 − 1 (p = 0.78) and Z3 + 1 (p = 0.39), with significant correlation between the machines (r = −0.38, p < 0.01 and r = −0.6, p < 0.01). There was no difference in K1, K2 and mean astigmatism. J0 was negative with both devices (against-the-rule astigmatism), but there was no correlation. J45 was negative with the Pentacam HR® (more myopic oblique astigmatism) but significantly correlated between the devices. Pupil size was smaller with Pentacam HR® (p < 0.01). In summary, these devices cannot be used interchangeably. Corneal Z40 was significantly different with more negative Z40 with iTrace® compared to Pentacam HR®. iTrace® operates with lower illumination, giving larger pupil size than Pentacam HR®, which uses intense blue light during measurement. No correlation was found for J0. Pentacam HR® had a trend to record more negative J45 (myopic oblique astigmatism).
本研究旨在评估Pentacam HR®（德国韦茨拉尔奥culus Optikgeraete有限公司）和iTrace®（美国得克萨斯州休斯顿Tracey Technologies公司）之间的角膜前表面波前像差、角膜曲率、散光矢量和瞳孔大小。在这项观察性研究中，100只眼睛（50名健康志愿者）在中度照明条件下使用Pentacam HR®和iTrace®进行扫描。测量了角膜前表面像差（球差（Z40）、垂直彗差（Z3 - 1）、水平彗差（Z3 + 1））、最平子午线（K1）和最陡子午线（K2）的角膜曲率、平均散光、散光矢量（J0和J45）以及瞳孔大小。我们发现Z40存在显著差异（Pentacam®：+0.30±0.11 µm，iTrace®：−0.03 µm±0.05 µm；p<0.01），且两种设备之间无相关性（r = -0.12，p = 0.22）。两种设备在Z3 - 1（p = 0.78）和Z3 + 1（p = 0.39）方面完全一致，且两台机器之间存在显著相关性（r = -0.38，p<0.01和r = -0.6，p<0.01）。K1、K2和平均散光无差异。两种设备测得的J0均为负值（逆规散光），但无相关性。Pentacam HR®测得的J45为负值（更多近视斜向散光），但两种设备之间存在显著相关性。Pentacam HR®测得的瞳孔大小较小（p<0.01）。总之，这些设备不能互换使用。与Pentacam HR®相比，角膜Z40存在显著差异，iTrace®测得的Z40更负。iTrace®在较低照明条件下运行，其测得的瞳孔大小比Pentacam HR®大，Pentacam HR®在测量过程中使用强蓝光。未发现J0存在相关性。Pentacam HR®有记录到更多负J45（近视斜向散光）的趋势。
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