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

Shah, Jinesh M.; Han, Daphne; Htoon, Hla Myint

doi:10.1016/j.jcrs.2014.05.044

Cited by 6 publications

(6 citation statements)

References 19 publications

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“…The simple OCT instrument had a limited role in measuring cornea power, and the combination of OCT and Placido-disk imaging is considered to be an effective means for improving the accuracy. Several studies [11][12][13] also generated high repeatability of TD-OCT when combined with Placido instrument (Omni, Carl Zeiss Meditec AG, Germany) in measuring corneal power indices.…”

Section: Discussionmentioning

confidence: 99%

“…OCT is considered a high-resolution, real-time ocular imaging technology. Time-domain OCT combined with Placido disk corneal topographer [10][11][12][13], spectral-domain OCT (SD-OCT) with or without Placido disk imaging [14][15][16], and swept-source OCT (SS-OCT) were commercially released for acquiring the topographic map of cornea [17,18]. Several studies have reported high precision of anterior segment SS-OCT, CASIA (SS-1000; Tomey, Nagoya, Japan), in acquiring pachymetric and keratometric data of the central cornea [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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The precision and agreement of corneal thickness and keratometry measurements with SS-OCT versus Scheimpflug imaging

et al. 2020

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Purpose: To assess the repeatability and reproducibility of swept-source optical coherence tomography (SS-OCT) and Scheimpflug system and evaluate the agreement between the two systems in measuring multiple corneal regions in children. Methods: Pachymetric and keratometric maps for both systems were evaluated. Central, midperipheral and peripheral corneal thickness (CT), keratometry and astigmatism power vectors were recorded. The three outcomes yielded by the same observer were used to assess intraobserver repeatability. The differences in the mean values provided by each observer were used to evaluate interobserver reproducibility. Within-subject standard deviation, test-retest repeatability (TRT) and coefficient of variation (CoV) were used to analyze the intraobserver repeatability and interobserver reproducibility. Paired T-test and Bland-Altman were used to appraise interdevice agreement. Results: Seventy-eight eyes of 78 children were included. The CoV was ≤2.12 and 1.10%, respectively, for repeatability and reproducibility. TRT and CoV were lower for central and paracentral CT measurements than for peripheral measurements. The SS-OCT device generated higher precision when acquiring CT data, whereas Scheimpflug system showed higher reliability when measuring corneal keratometry. Although the CT readings measured using SS-OCT were significantly thinner than Scheimpflug device (P < 0.001), the central and thinnest CT values were still of high agreement. The interdevice agreement of keratometry measurement was high for the central corneal region and moderate for the paracentral and peripheral areas. Conclusions: The precision of CT measurements by SS-OCT was higher, while the reliability of keratometry measurements by the Scheimpflug system was higher in children. Apart from the measured values in the central corneal region, the thickness and keratometry readings should not be considered interchangeable between the two systems.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The precision and agreement of corneal thickness and keratometry measurements with SS-OCT versus Scheimpflug imaging

et al. 2020

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“…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.…”

Section: Introductionmentioning

confidence: 73%

“…In a previous study in which we investigated the repeatability of the Visante Omni on humans, narrower LoA were demonstrated for intraobserver SimK, interobserver SimK, and interobserver posterior surface elevation measurements (0.2842-0.2922 D, À0.3031 to 0.3061 D, and À0.0442 D to 0.0442 D, respectively). 21 Better repeatability in humans may occur due to their ability, in contrast to that of rabbits, to focus on the fixation target during scans. 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.…”

Section: Discussionmentioning

confidence: 99%

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

Liu

Konstantopoulos

Riau

et al. 2015

Trans. Vis. Sci. Tech.

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“…This outcome is consistent with the results of previous studies evaluating the consistency of posterior corneal astigmatic measurements provided by different types of Scheimpflug imaging devices. 17–26 Bao et al 18 reported S w values of less than 0.12 D for posterior corneal astigmatism measured with two Scheimpflug-based devices (Sirius; CSO and TMS-5; Tomey Corp., Nagoya, Japan). In another study, good intrasession precision values (1.96 × S w ) were obtained for keratometric readings (<0.09 D) obtained with the Scheimpflug-based system Pentacam.…”

Section: Discussionmentioning

confidence: 99%

Validation of posterior corneal curvature measurements with color light-emitting diode topography

Piñero

Camps

Sáiz

et al. 2019

European Journal of Ophthalmology

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Purpose: To evaluate the intrasession repeatability and validity of posterior corneal curvature and astigmatism measurements provided by a color light-emitting diode reflection topography system in healthy eyes. Methods: A total of 40 healthy eyes of 40 patients (age, 16–66 years) were enrolled. A complete eye examination was performed in all cases including posterior topographic analysis with two systems: the Scheimpflug-based system (Pentacam; Oculus Optikgeräte GmbH, Wetzlar, Germany) and the Cassini system (i-Optics; Ophthec, The Hague, The Netherlands). With this last system, three consecutive measurements were taken to assess the level of intrasession repeatability (within-subject standard deviation, Sw; intraclass correlation coefficient). The Bland & Altman analysis was used to evaluate the interchangeability of both devices. Results: The Sw was ⩽0.06 mm for all posterior corneal radius measurements, with intraclass correlation coefficient of ⩾0.960. The Sw for the magnitude of astigmatism, J0, and J45 were 0.15, 0.04, and 0.04 D, respectively, with intraclass correlation coefficient values of 0.876, 0.897, and 0.840, respectively. Statistically significant differences between devices were found in all parameters evaluated (p ⩽ 0.025). The interchangeability analysis revealed the presence of clinically relevant limits of agreement for the flattest (0.03 to 0.50 mm) and steepest posterior corneal radii (–0.01 to 0.39 mm). In contrast, limits of agreements were not clinically relevant for the magnitude of posterior astigmatism (–0.17 to 0.27 D) and their power vector components (–0.11 to 0.15 D). Conclusion: The Cassini system provides consistent measures of posterior corneal curvature and astigmatism in healthy eyes, but only measures of posterior astigmatism can be considered as interchangeable with those provided by the Pentacam.

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

Abstract: No author has a financial or proprietary interest in any material or method mentioned.

Cited by 6 publications

References 19 publications

The precision and agreement of corneal thickness and keratometry measurements with SS-OCT versus Scheimpflug imaging

The precision and agreement of corneal thickness and keratometry measurements with SS-OCT versus Scheimpflug imaging

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

Validation of posterior corneal curvature measurements with color light-emitting diode topography

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