Agreement and reliability in measuring central corneal thickness with a rotating Scheimpflug–Placido system and ultrasound pachymetry

Maresca, Nunzio; Zeri, Fabrizio; Palumbo, Paolo; Calossi, Antonio

doi:10.1016/j.clae.2014.07.009

Cited by 19 publications

(17 citation statements)

References 32 publications

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“…Nam et al [7] reported a TRT and CoV of CCT of 10.0 mm and 0.67%, respectively, using the Pentacam. Hernández-Camarena et al [18] demonstrated strong repeatability of CCT measurements using the Sirius, and similar results were reported by Maresca et al [19]. Some studies also showed good repeatability and reproducibility from the Galilei.…”

Section: Discussionsupporting

confidence: 62%

Precision of Corneal Thickness Measurements Obtained Using the Scheimpflug-Placido Imaging and Agreement with Ultrasound Pachymetry

Huang

Savini

Wang

et al. 2015

Journal of Ophthalmology

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Purpose. To assess the reliability and comparability of measuring central corneal thickness (CCT) and thinnest corneal thickness (TCT) using a new Scheimpflug-Placido analyzer (TMS-5, Japan) and ultrasound (US) pachymetry. Methods. Seventy-six healthy subjects were prospectively measured 3 times by 1 operator using the TMS-5, 3 additional consecutive scans were performed by a second operator, and ultrasound (US) pachymetry measurements were taken. The test-retest repeatability (TRT), coefficient of variation (CoV), and intraclass correlation coefficient (ICC) were calculated to evaluate intraoperator repeatability and interoperator reproducibility. Agreement among the devices was assessed using Bland-Altman plots and 95% limits of agreement (LoA). Results. The intraoperators TRT and CoV were <19 μm and 2.0%, respectively. The interoperators TRT and CoV were <12 μm and 1.0%, respectively, and ICC was >0.90. The mean CCT and TCT measurements using the TMS-5 were 15.97 μm (95% LoA from −26.42 to −5.52 μm) and 20.32 μm (95% LoA from −30.67 to −9.97 μm) smaller, respectively, than those using US pachymetry. Conclusions. The TMS-5 shows good repeatability and reproducibility for measuring CCT and TCT in normal subjects but only moderate agreement with US pachymetry results. Caution is warranted before using these techniques interchangeably.

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Section: Discussionsupporting

confidence: 62%

Precision of Corneal Thickness Measurements Obtained Using the Scheimpflug-Placido Imaging and Agreement with Ultrasound Pachymetry

Huang

Savini

Wang

et al. 2015

Journal of Ophthalmology

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“…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.…”

Section: Discussionmentioning

confidence: 99%

“…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: 99%

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 central corneal thickness measurements by TMS‐5 (Scheimpflug‐Placido) were only found to be in moderate agreement with ultrasound pachymetry . Sirius and ultrasound pachymetry were not recommended to be used interchangeably for central corneal thickness measurement . Multiple studies reported differences in corneal thickness values in Sirius compared to ultrasound pachymetry .…”

Section: Comparison Among Different Devices: Repeatability and Agreementmentioning

confidence: 99%

“…80 Sirius and ultrasound pachymetry were not recommended to be used interchangeably for central corneal thickness measurement. 81,82 Multiple studies reported differences in corneal thickness values in Sirius compared to ultrasound pachymetry. 55,82,83 Pachymetry measurements were thicker when measured with Sirius compared to ultrasound pachymetry.…”

Section: Agreementmentioning

confidence: 99%

Applications of corneal topography and tomography: a review

Fan

Chan

Prakash³

et al. 2018

Clinical Exper Ophthalmology

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Corneal imaging is essential for diagnosing and management of a wide variety of ocular diseases. Corneal topography is used to characterize the shape of the cornea, specifically, the anterior surface of the cornea. Most corneal topographical systems are based on Placido disc that analyse rings that are reflected off the corneal surface. The posterior corneal surface cannot be characterized using Placido disc technology. Imaging of the posterior corneal surface is useful for diagnosis of corneal ectasia. Unlike corneal topographers, tomographers generate a three-dimensional recreation of the anterior segment and provide information about the corneal thickness. Scheimpflug imaging is one of the most commonly used techniques for corneal tomography. The cross-sectional images generated by a rotating Scheimpflug camera are used to locate the anterior and posterior corneal surfaces. The clinical uses of corneal topography include, diagnosis of corneal ectasia, assessment of corneal astigmatism, and refractive surgery planning. This review will discuss the applications of corneal topography and tomography in clinical practice.

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Agreement and reliability in measuring central corneal thickness with a rotating Scheimpflug–Placido system and ultrasound pachymetry

Cited by 19 publications

References 32 publications

Precision of Corneal Thickness Measurements Obtained Using the Scheimpflug-Placido Imaging and Agreement with Ultrasound Pachymetry

Precision of Corneal Thickness Measurements Obtained Using the Scheimpflug-Placido Imaging and Agreement with Ultrasound Pachymetry

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

Applications of corneal topography and tomography: a review

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