Assessment of Anterior Chamber Depth Using Visante Optical Coherence Tomography, Slitlamp Optical Coherence Tomography, IOL Master, Pentacam and Orbscan IIz

Abstract

Aims: To assess and compare the anterior chamber depth (ACD) by different anterior segment imaging techniques. Methods: Eighty healthy eyes of 40 patients were recruited, and 3 consecutive measurements of ACD were determined prospectively utilizing Visante optical coherence tomography (OCT), slitlamp (SL) OCT, IOL Master, Pentacam and Orbscan IIz. The statistical significance of interdevice differences between measurements was evaluated by one-way ANOVA and Bland-Altman analysis. The repeatability of 3 consecutive measurements was analyzed by repeated-measures ANOVA. Results: The mean ACD was 2.98 ± 0.29, 2.85 ± 0.29, 3.33 ± 0.42, 2.93 ± 0.30 and 2.80 ± 0.29 mm with Visante OCT, SL-OCT, IOL Master, Pentacam and Orbscan IIz, respectively. All devices displayed a high intrasession repeatability (repeated-measures ANOVA, p > 0.05). ACD measurements obtained by the IOL Master were significantly greater compared to other devices. ACD values detected by Visante OCT and SL-OCT, Pentacam and Orbscan IIz were not clinically interchangeable, even though no statistically significant difference was detected. Conclusion: Although noncontact ACD measurements using all modalities were easy to handle and demonstrated good repeatability, the tested devices were not regarded as compatible. Hence, the clinician should take the different modalities into consideration during ACD assessment using various devices.

Comparison of anterior chamber depth measurements by 3-dimensional optical coherence tomography, partial coherence interferometry biometry, Scheimpflug rotating camera imaging, and ultrasound biomicroscopy

“…Our findings are in agreement with those of Dinc et al, 18 who measured the ACD from the corneal endothelium to the anterior surface of the lens and found a mean ACD of 3.33 mm using the IOLMaster PCI biometer, 2.93 mm using the Pentacam Scheimpflug camera, and 2.98 mm using the Visante OCT device (Carl Zeiss Meditec) (n Z 40). In our study, the IOLMaster PCI measurements were longer than the Pentacam Scheimpflug measurements (3.71 mm versus 3.24 mm; 95% CI, 0.433-0.517), whereas the PCI true measurements were shorter than the Scheimpflug device measurements (3.24 mm versus 3.18 mm; 95% CI, 0.018-0.102).…”

Anterior chamber depth measurements using Scheimpflug imaging and optical coherence tomography: Repeatability, reproducibility, and agreement

“…However, none of these studies compared ACD measurements by all 4 devices at the same time under identical conditions using a large enough sample. For example, studies have reported that the Pentacam device offered good intraobserver repeatability 25,26 and interobserver reproducibility for ACD measurements. 26 In another study by Chen et al, 19 excellent intraobserver repeatability was shown for ACD measurements using the Sirius system, with a repeatability limit of 0.02 mm.…”

Evaluation of the Changes in Anterior Segment Morphology After Laser Peripheral Iridotomy Through One-Year Follow-Up

“…Çalışmaların çoğunda Pentacam (Oculus-Optikgerate GmbH-Wetzlar-Germany) sistemi kullanılmıştır. 10,[13][14][15][16] Her iki cihazda da açı hesaplamaları ham sayısal görüntülerin (verilerin) interpolasyon veya ekstrapolasyon yöntemleriyle analiz edilmesinden elde edilir. Sirius sisteminde Nazal ve temporal kadranları kesen yedi aksiyel Scheimpflug kesitin ham görüntülerinden elde edilen ÖKA ortalamaları ile OÖKA elde edilir.…”