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Repeatability and comparability of anterior segment biometry obtained by the Sirius and the Pentacam analyzers

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Abstract

To assess the repeatability and comparability of six anterior segment biometry parameters obtained with a novel Scheimpflug camera with a Placido disc topographer (Sirius) and slit-scanning tomography with a Scheimpflug camera (Pentacam), in a sample of 16 unoperated eyes of healthy subjects. The anterior segment was analyzed by a single examiner using the Sirius and the Pentacam analyzers. Mean simulated keratometry (Sim K), flat and steep axis keratometry (K f and K s ), central and thinnest corneal thicknesses (CCT and TCT), and anterior chamber depth (ACD) measurements were evaluated. Repeatability of three sets of measurements from each device was assessed using the coefficient of variation (CV), within-subject standard deviation, and intraclass correlation coefficient (ICC). Bonferroni-adjusted t-tests, and Bland and Altman plots were used to establish agreement between devices. For both devices the CV of repeated measurements was <0.79 %. The ICC was >0.95 in all measurements except for Sirius K s (ICC = 0.869). For all parameters evaluated, the Pentacam systematically yielded higher values, although differences were statistically significant in only three parameters—0.31 diopters for K s , 10.1 μm for CCT and 12.4 μm for TCT. In the assessment of normal corneas both devices showed overall high repeatability. Although good agreement was found in three parameters (Sim K, K f and ACD) these devices do not seem to be interchangeable for pachymetric determination.

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References

  1. Cairns G, Collins A, McGhee C (2003) A corneal model for slit-scanning elevation topography. Ophthalmic Physiol Opt 23:193–204. doi:10.1046/j.1475-1313.2003.00107.x

    Article  CAS  PubMed  Google Scholar 

  2. O’Donnell C, Maldonado-Codina C (2005) Agreement and repeatability of central thickness measurement in normal corneas using ultrasound pachymetry and the OCULUS Pentacam. Cornea 24:920–924. doi:10.1097/01.ico.0000157422.01146.e9

    Article  PubMed  Google Scholar 

  3. Lackner B, Schmidinger G, Pieh S, Funovics MA, Skorpik C (2005) Repeatability and reproducibility of central corneal thickness measurement with Pentacam, Orbscan, and Ultrasound. Optom Vis Sci 82:892–899. doi:10.1097/01.opx.0000180817.46312.0a

    Article  PubMed  Google Scholar 

  4. Lam AKC, Chen D (2007) Pentacam pachometry: comparison with non-contact specular microscopy on the central cornea and inter-session repeatability on the peripheral cornea. Clin Exp Optom 90:108–114. doi:10.1111/j.1444-0938.2006.00103.x

    Article  PubMed  Google Scholar 

  5. Kawamorita T, Uozato H, Kamiya K, Bax L, Tsutsui K, Aizawa D, Shimizu K (2009) Repeatability, reproducibility, and agreement characteristics of rotating Scheimpflug photography and scanning-slit corneal topography for corneal power measurement. J Cataract Refract Surg 35:127–133. doi:10.1016/j.jcrs.2008.10.019

    Article  PubMed  Google Scholar 

  6. De Sanctis U, Missolungi A, Mutani B, Richiardi L, Grignolo FM (2007) Reproducibility and repeatability of central corneal thickness measurement in keratoconus using the rotating Scheimpflug camera and ultrasound pachymetry. Am J Ophthalmol 144:712–718. doi:10.1016/j.ajo.2007.07.021

    Article  PubMed  Google Scholar 

  7. Shankar H, Taranath D, Santhirathelagan CT, Pesudovs K (2008) Anterior segment biometry with the Pentacam: comprehensive assessment of repeatability of automated measurements. J Cataract Refract Surg 34:103–113. doi:10.1016/j.jcrs.2007.09.013

    Article  PubMed  Google Scholar 

  8. Feng Y, Varikoot J, Simpso TL (2001) Diurnal variation of corneal and corneal epithelial thickness measured using optical coherence tomography. Cornea 20:480–483. doi:10.1097/00003226-200107000-00008

    Article  CAS  PubMed  Google Scholar 

  9. Bland JM, Altman DG (2007) Agreement between methods of measurement with multiple observations per individual. J Biopharm Stat 17:571–582. doi:10.1080/10543400701329422

    Article  PubMed  Google Scholar 

  10. Chen D, Lam AKC (2009) Reliability and repeatability of the Pentacam on corneal curvatures. Clin Exp Optom 92:110–118. doi:10.1111/j.1444-0938.2008.00336.x

    Article  PubMed  Google Scholar 

  11. Al-Mezaine HS, Al-Amro SA, Kangave D, Sadaawy A, Wehaib TA, Al-Obeidan S (2008) Comparison between central corneal thickness measurements by oculus pentacam and ultrasonic pachymetry. Int Ophthalmol 28:333–338. doi:10.1007/s10792-007-9143-9

    Article  PubMed  Google Scholar 

  12. Nemeth G, Vajas A, Kolozsvari B, Berta A, Modis L (2006) Anterior chamber depth measurements in phakic and pseudophakic eyes: Pentacam versus ultrasound device. J Cataract Refract Surg 32:1331–1335. doi:10.1016/j.jcrs.2006.02.057

    Article  PubMed  Google Scholar 

  13. Salouti R, Nowroozzadeh MH, Zamani M, Ghoreyshi M, Salouti R (2010) Comparison of anterior chamber depth measurements using Galilei, HR Pentacam, and Orbscan II. Optometry 81:35–39. doi:10.1016/j.optm.2009.04.100

    Article  PubMed  Google Scholar 

  14. Lackner B, Schmidinger G, Skorpik C (2005) Validity and repeatability of anterior chamber depth measurements with Pentacam and Orbscan. Optom Vis Sci 82:858–861. doi:10.1097/01.opx.0000177804.53192.15

    Article  PubMed  Google Scholar 

  15. Burdock EI, Fleiss JL, Hardesty AS (1963) A new view of inter-observer agreement. Person Psychol 16:373–384. doi:10.1111/j.1744-6570.1963.tb01283.x

    Article  Google Scholar 

  16. Savini G, Barboni P, Carbonelli M, Hoffer KJ (2011) Repeatability of automatic measurements by a new Scheimpflug camera combined with Placido topography. J Cataract Refract Surg 37:302–309. doi:10.1016/j.jcrs.2010.07.039

    Article  PubMed  Google Scholar 

  17. Menassa N, Kaufmann C, Goggin M, Job OM, Bachmann LM, Thiel MA (2008) Comparison and reproducibility of corneal thickness and curvature readings obtained by the Galilei and the Orbscan II analysis systems. J Cataract Refract Surg 34:1742–1747. doi:10.1016/j.jcrs.2008.06.024

    Article  PubMed  Google Scholar 

  18. Savini G, Carbonelli M, Sbreglia A, Barboni P, Deluigi G, Hoffer KJ (2011) Comparison of anterior segment measurements by 3 Scheimpflug tomographers and 1 Placido corneal topographer. J Cataract Refract Surg 37:1679–1685. doi:10.1016/j.jcrs.2011.03.055

    Article  PubMed  Google Scholar 

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Disclosure

This manuscript is not currently under consideration, in press or published elsewhere. This study has not been presented elsewhere. This manuscript is truthful original work without fabrication, fraud or plagiarism. We have made an important scientific contribution to this study, we are familiar with the primary data, and we have read the entire manuscript and take responsibility for its content. No author has a financial or proprietary interest in any material or method mention in this study. No financial support or benefits have been received from any private or public sources.

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Authors and Affiliations

  1. Cornea and Ocular Surface Clinic, Ophthalmology Department, La Raza Medical Center, IMSS (Mexican Institute of Social Security), Mexico City, Mexico

    Paola De la Parra-Colín

  2. Destellos de Luz Non-Profit Foundation, Monterrey City, Mexico

    Manuel Garza-León

  3. Center for Population Health Research, National Institute of Public Health, Mexico City, Mexico

    Tonatiuh Barrientos-Gutierrez

  4. Center for Integrative Approaches to Population Health, University of Michigan, Ann Arbor, MI, USA

    Tonatiuh Barrientos-Gutierrez

  5. Institute for Sight Preservation, Monterrey City, Mexico

    Manuel Garza-León

Authors
  1. Paola De la Parra-Colín
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  2. Manuel Garza-León
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  3. Tonatiuh Barrientos-Gutierrez
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Correspondence to Manuel Garza-León.

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De la Parra-Colín, P., Garza-León, M. & Barrientos-Gutierrez, T. Repeatability and comparability of anterior segment biometry obtained by the Sirius and the Pentacam analyzers. Int Ophthalmol 34, 27–33 (2014). https://doi.org/10.1007/s10792-013-9780-0

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  • DOI: https://doi.org/10.1007/s10792-013-9780-0

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