Repeatability and Intrasession Reproducibility Obtained by the Sirius Anterior Segment Analysis System

Masoud, Muhannad; Livny, Eitan; Bahar, Irit

doi:10.1097/icl.0000000000000074

Cited by 26 publications

(35 citation statements)

References 19 publications

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“…Accordingly, S w was below 1.22°for all temporal IA measurements. This is consistent with intra-observer variability reported previously for IA measured using Scheimpflug imaging [8,17]. Bosem et al [17] found mean intra-observer variability in IA measurement of 1.81°in a sample of healthy eyes, including open and narrow angles, using a Scheimpflug photography-based system.…”

Section: Discussionsupporting

confidence: 85%

“…Some studies have assessed the repeatability of various anterior segment measurements provided by the same Scheimpflug imaging-based system as that used in the current study [6][7][8][9][10], with most reporting high levels of consistency [10][11][12][13][14]. However, few works have studied the repeatability of IA measurements [8], and to date, there is no study validating the consistency of measurements provided by the glaucoma mode of the Scheimpflug imagingbased system used in our series. In the current study, we evaluated the repeatability of IA measurements provided by this glaucoma mode, which analyzes the angle at different nasal and temporal meridians (−30°to 30°).…”

Section: Discussionmentioning

confidence: 77%

“…One example of a system providing non-invasive measurement of the IA is the Sirius ® system (Costruzione Strumenti Oftalmici [CSO], Florence, Italy), a non-contact 3D rotating Scheimpflug camera combined with a Placido ring that provides different anatomical measurements of the anterior segment. While there is strong scientific evidence of the consistency and repeatability of anterior segment measurements provided by this system in healthy and even pathological eyes [6][7][8][9][10][11][12][13][14][15], evidence of the repeatability of IA measurements is limited [8]. Likewise, to the best of our knowledge, no studies have evaluated and compared the consistency of IA measurements at different nasal and temporal meridians using this device.…”

Section: Introductionmentioning

confidence: 96%

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Intra-session repeatability of iridocorneal angle measurements provided by a Scheimpflug photography-based system in healthy eyes

Ruiz-Belda¹,

Piñero

Ruiz-Fortes³

et al. 2015

Graefes Arch Clin Exp Ophthalmol

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Intra-session repeatability of iridocorneal angle measurements provided by a Scheimpflug photography-based system in healthy eyes

Ruiz-Belda¹,

Piñero

Ruiz-Fortes³

et al. 2015

Graefes Arch Clin Exp Ophthalmol

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“…The Scheimpflug placido imaging technology (Sirius) is a relatively new advancement that has been reported to be highly reproducible and repeatable [27,32,33]. To the best of our knowledge, this is the first study that investigated the characterization of anterior segment parameters of keratoconus eyes using the Scheimpflug-placido Sirius topographer in a Southern Egyptian population.…”

Section: Discussionmentioning

confidence: 99%

“…All the other measurements for internal structures (posterior corneal curvature, anterior lens surface, and iris) are derived solely from Scheimpflug data. Previous studies have reported that the system's pachymetric and shape measurements (curvature, eccentricity, elevation) have good repeatability [23,27]. Measurements were performed by a single experienced examiner (EM).…”

Section: Methodsmentioning

confidence: 99%

Anterior Segment Characteristics of Keratoconus Eyes Using Scheimpflug-Placido Topography

Mostafa¹

2016

J Clin Res Ophthalmol

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Purpose: To assess anterior segment parameters of keratoconus (KC) eyes at different stages of the disease using Scheimpflug-placido topography (Sirius, CSO, Italy) in a sample of the southern Egyptian population.Methods: retrospective study of 400eyes of different grades of keratoconus along with 50 normal eyes as a control group were assessed for the following parameters: corneal thickness at apex (CCT), thinnest corneal thickness (TCT), anterior chamber depth (ACD), corneal volume (CV), corneal keratometry, corneal asphericity (Q), corneal elevation (both anterior and posterior) with aspherotoric surface as a reference, total root mean square (RMS), RMS Coma, RMS spherical aberration (SA), RMS Astigmatism, , Baiocchi Calossi Versaci front index (BCV f ) and BCV back index (BCV b ). They underwent Sirius Schemipflug placid topographer evaluation.Results: eyes were subdivided into: normal group (50 eyes), suspect KC (82eyes), grade 1 KC (80eyes), grade 2 KC (142eyes), and grade 3 KC (96eyes). The thinnest corneal thickness corneal thickness at apex and posterior corneal elevation were significantly different in all comparison groups. ACD values showed inconsistent differences between groups. Corneal volume was proved to be significant in comparing normal vs suspect KC group as well as in normal vs mild KC and normal vs moderate KC. Total RMS, RMS coma and BCV f and BCV b were significant for most groups Conclusion: Corneal thickness and high order aberrations proved to be able to diagnose different grades of keratoconus while corneal volume did not prove to have a significant role.

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Comparison of the measurements of a novel optical biometry: Nidek AL-Scan with Sirius and a ultrasound biometry

2016

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To investigate the accuracy of the measurements of Nidek AL-Scan by comparing with Sirius (CSO, Florence, Italy), a corneal tomography which also employs the Scheimpflug principle, and a commonly used device, ultrasound biometry (UB) (Aviso A/B, Quantel Medical, MT, USA). Right eyes of 85 healthy volunteers (58 women 27 men) with a mean age of 39.24 ± 14.37 years (range 15-68) were enrolled into this comparative prospective study. Average K 2.4, average K 3.3, CCT (central corneal thickness), WTW (white to white distance), ACD (anterior chamber depth) and AL (axial length) were obtained from the AL-Scan and compared with average SimK, CCT, WTW (horizontal anterior chamber diameter) and ACD obtained from Sirius and also compared with ACD and AL obtained from UB. The statistically significant difference was found between all of the measurements (p < 0.001) except the average keratometry values (K2.4, K3.3, SimK) (p = 0.083). There was a perfect correlation between keratometry, CCT and AL measurements of the devices (ICC = 0.977, 0.954, 0.923, respectively) and there was a strong correlation between the WTW measurements of AL-Scan and Sirius (ICC = 0.865). While ACD parameter of AL-Scan and UB showed a perfect correlation (ICC = 0.977), there was a moderate correlation between AL-Scan and Sirius and also between UB and Sirius (ICC = 0.608 and 0.664, respectively). There was a high correlation between the all measurements, besides ACD, of AL-Scan and Sirius and they can be used interchangeably for average keratometry and WTW confidently. However, ACD and CCT have a broader 95 % LoA (-0.039 to 0.744 and -24.985 to 3.691, respectively). In addition, AL-Scan and UB were in good agreement regarding ACD, while differences in AL measurements of UB and AL-Scan were clinically important (95 % LoA = -0.091 to 0.703). Furthermore, UB and Sirius have a moderate agreement regarding ACD (95 % LoA = -0.047 to 0.680).

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Repeatability and Intrasession Reproducibility Obtained by the Sirius Anterior Segment Analysis System

Abstract: The Sirius Scheimpflug system has a very high repeatability and intrasessional reproducibility when measuring the ACD, ACA, anterior curvature parameters, and the thinnest corneal location. Thus, it can be used with confidence in clinical practice.

Cited by 26 publications

References 19 publications

Intra-session repeatability of iridocorneal angle measurements provided by a Scheimpflug photography-based system in healthy eyes

Intra-session repeatability of iridocorneal angle measurements provided by a Scheimpflug photography-based system in healthy eyes

Anterior Segment Characteristics of Keratoconus Eyes Using Scheimpflug-Placido Topography

Comparison of the measurements of a novel optical biometry: Nidek AL-Scan with Sirius and a ultrasound biometry

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