Precision Analysis of Posterior Corneal Topography Measured by Visante Omni: Repeatability, Reproducibility, and Agreement With Orbscan II

Abstract

The Visante Omni provides good repeatability and reproducibility of posterior corneal topography. Overall agreement with the Orbscan II system was high.

Intraobserver repeatability and interobserver reproducibility of corneal measurements in normal eyes using an optical coherence tomography–Placido disk device

“…The study found that the device provided highly reproducible intraobserver and interobserver measurements of the posterior corneal curvature (3.0 mm and 6.0 mm, respectively) and of the posterior corneal elevation BFS (5.0 mm and 8.0 mm, respectively). Furthermore, the intraobserver and interobserver mean biases for posterior corneal curvature at 3.0 mm and 6.0 mm did not exceed 0.03 D, 13 and the intraobserver and interobserver mean biases for posterior corneal curvature BFS at 5.0 mm and 8.0 mm did not exceed 0.03 mm. 13 Our findings of high intraobserver and interobserver reproducibility for the above parameters agree with the findings in the previous study.…”

“…Furthermore, the intraobserver and interobserver mean biases for posterior corneal curvature at 3.0 mm and 6.0 mm did not exceed 0.03 D, 13 and the intraobserver and interobserver mean biases for posterior corneal curvature BFS at 5.0 mm and 8.0 mm did not exceed 0.03 mm. 13 Our findings of high intraobserver and interobserver reproducibility for the above parameters agree with the findings in the previous study. However, to our knowledge, no previous study has assessed the intraobserver and interobserver reproducibility of the Visante Omni device's measurements of the corneal parameters of anterior and posterior corneal topography and aberrometry, making our study the first to do so.…”

“…Previous studies have shown the accuracy and reproducibility of the Atlas corneal topographer [5][6][7] and the Visante OCT system [8][9][10][11][12] individually; however, there is only a single publication on their combined use in 1 device. 13 This study was performed to examine the intraobserver repeatability and interobserver reproducibility of the Visante Omni system (OCT-Placido device) for corneal topography and aberrometry measurements in normal corneas.…”

Repeatability and Reproducibility of Corneal Biometric Measurements Using the Visante Omni and a Rabbit Experimental Model of Post-Surgical Corneal Ectasia

“…The only other study to have investigated the Visante Omni also found good repeatability and reproducibility on humans; interobserver posterior elevation measurements had LoA between À0.08 to 0.08 mm and À0.14 to 0.10 mm for the 8-and 5-mm best-fit spheres, respectively. 22 The imaging capabilities of the Visante Omni enabled us to evaluate the effect of stromal photoablation on the development of ectasia in the rabbit cornea. Deep excimer ablation was performed in order to achieve maximal corneal ectasia.…”

“…The latter is used to derive anterior surface topography measurements that are summated with the pachymetric Visante OCT measurements to provide posterior corneal surface topography. We, 21 and others, 22 have previously found that the Visante Omni has excellent repeatability and reproducibility of anterior and posterior corneal topography in healthy patients.…”