Wavefront aberrometry repeatability and agreement—A comparison between Pentacam AXL Wave, iTrace and OPD‐Scan III

Abstract

Introduction To compare intrasession agreement and repeatability of wavefront aberration measurements from three different aberrometers obtained using Hartmann–Shack, ray tracing and automated retinoscopy methods, as well as their interdevice agreement. Methods Three consecutive measurements were obtained using the Pentacam AXL Wave, the iTrace and the OPD‐Scan III in 47 eyes of 47 patients. Wavefront refractions, root mean square of total aberrations (RMS total), RMS of higher‐order aberrations (HOA) and second‐, third‐ and fourth‐order HOAs were exported for 4‐mm pupils. Wavefront refractions were converted into vector components: M, J0 and J45. Intrasession agreement and repeatability were evaluated using intraclass correlation coefficients (ICCs) and repeatability coefficients (RCs); interdevice agreement was assessed using the Bland–Altman method. Results The intrasession agreement and repeatability of RMS HOA were comparable between the three devices; both the Pentacam AXL Wave and the OPD‐Scan III had better intrasession agreement and repeatability for the RMS total than the iTrace (p ≤ 0.02). Intrasession repeatability for the majority of second‐ and third‐order aberrations was better on the Pentacam AXL Wave than on the iTrace (p ≤ 0.01) and OPD‐Scan III (p ≤ 0.04), although their agreement and repeatability in spherical aberration were comparable (p ≥ 0.24). Significant systematic differences and proportional bias were detected for almost all refraction power vectors and Zernike coefficients among the three devices. Conclusions In this study, all three devices provided good‐to‐excellent agreement for aberration measurements. Most of the individual Zernike's components were not exchangeable between different aberrometers. Their relative intrasession performance in agreement and repeatability varied significantly across different ocular aberration parameters.

A Comprehensive Wavefront Assessment of Keratoconus Using an Integrated Scheimpflug Corneal Tomographer/Hartmann–Shack Wavefront Aberrometer

“…This result was believed to be because of the smaller measurement values and narrower standard deviations in the control group, resulting in smaller ICC values in the control group than in the KC group. Overall, as reported by Kundu et al 21,22 good intrasubject repeatability was found in healthy eyes and eyes with KC.…”

“…Recently, several researchers have reported on the repeatability and agreement of the device used herein compared to other devices for wavefront measurement. [19][20][21][22][23] Thus far, there have been two reports on wavefront analysis in KC using this wavefront aberrometer, but both are simple comparisons with healthy eyes. 21,23 Consistent with the result of our previous investigation that used an integrated Placido-disk topography system with a Hartmann-Shack wavefront aberrometer, 15 wavefront properties generally correlated with KC severity classified based on clinical and topographic signs.…”

“…Recently, several researchers have reported on the repeatability and agreement of the device used herein compared to other devices for wavefront measurement. 19–23 Thus far, there have been two reports on wavefront analysis in KC using this wavefront aberrometer, but both are simple comparisons with healthy eyes. 21,23…”

Potential vision tester using adaptive optics, Maxwellian view, and small pupil

“…WF aberration data for each subject were collected from an FDA approved and commercially available WF measurement device (Pentacam AXL Wave, Oculus Optikgeraete GmbH, Wetzlar, Germany), selected because of the good repeatability [ 19 , 20 ]. The main aberration data were collected for natural pupil conditions at a 3 mm diameter, with the HSP.…”

Comparison of two swept-source optical coherence tomography devices, a Scheimpflug camera system and a ray-tracing aberrometer in the measurement of corneal power in patients with cataract

“…In other words, in addition to routine measurement, the evaluation of corneal parameters with wavefront analysis, including PK, TK and TNP, plays an important role in the preoperative assessment in cataract surgery, especially in eyes that have had prior refractive corneal surgery and in patients who desire a premium IOL [ 5 ]. Many systems with different principles, such as Hartmann–Shack, Tscherning, ray tracing (e.g., iTrace) and automated retinoscopy [ 6 ], have been widely used in clinical settings in recent years.…”