Comparison of the precision of the Topcon SP-3000P specular microscope and an ultrasound pachymeter

Comparison of the precision of the Topcon SP-3000P specular microscope and an ultrasound pachymeter

Turki M Almubrad, Uchechukwu L Osuagwu, Ibrahim AlAbbadi, Kelechi C OgbuehiCornea Research Chair, Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi ArabiaAim: To compare the precision of the Topcon SP-3000P noncontact specular microscope (NCSM) and the...

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Autores principales: Almubrad T, Osuagwu U, Al Abbadi I, Ogbuehi KC
Formato: article
Lenguaje:EN
Publicado: Dove Medical Press 2011
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Ophthalmology
RE1-994
Acceso en línea:https://doaj.org/article/2935c3ced97d48bc883423687d78c6c4
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spelling oai:doaj.org-article:2935c3ced97d48bc883423687d78c6c42021-12-02T01:29:11ZComparison of the precision of the Topcon SP-3000P specular microscope and an ultrasound pachymeter1177-54671177-5483https://doaj.org/article/2935c3ced97d48bc883423687d78c6c42011-06-01T00:00:00Zhttp://www.dovepress.com/comparison-of-the-precision-of-the-topcon-sp-3000p-specular-microscope-a7729https://doaj.org/toc/1177-5467https://doaj.org/toc/1177-5483Turki M Almubrad, Uchechukwu L Osuagwu, Ibrahim AlAbbadi, Kelechi C OgbuehiCornea Research Chair, Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi ArabiaAim: To compare the precision of the Topcon SP-3000P noncontact specular microscope (NCSM) and the DGH 500 ultrasound pachymeter (USP).Methods: Triplicate measurements of central corneal thickness (CCT) for 100 eyes were taken with an NCSM and a USP in 2 visits separated by 1 week. Repeatability was assessed by computing the differences between all 3 readings from each subject. Coefficients of repeatability and reproducibility were computed.Results: Mean CCT as measured by each instrument were: 518.53 ± 34.96 µm (range 417.33–592.67) and 516.94 ± 33.60 µm (range 431.67–582.67) for sessions 1 and 2 respectively, with the NCSM; 546.69 ± 36.62 µm (range 457.33–617.00) and 549.78 ± 35.26 µm (range 454.00–618.67) for sessions 1 and 2 respectively, with the USP. The ultrasound CCT measurements were consistently higher than those obtained with the NCSM in both sessions 28.17 ± 19.20 µm (mean ± SD, session 1) and 32.81 ± 14.04 (mean ± SD, session 2). The repeatability coefficient for the NCSM was better in both sessions than those for USP (±10 µm vs ± 12 µm in session 1 and ±8 µm vs ±10 µm in session 2). The reproducibility coefficient with the NCSM was half that with the USP (±21 µm vs ±41 µm).Conclusion: The SP-3000P NCSM is a more precise and reproducible instrument for measurement of CCT than the USP, but both instruments are reliable, useful instruments for measuring CCT.Keywords: cornea, Topcon SP-3000P, ultrasound pachymetry, repeatability coefficient, reproducibility coefficientAlmubrad TOsuagwu UAl Abbadi IOgbuehi KCDove Medical PressarticleOphthalmologyRE1-994ENClinical Ophthalmology, Vol 2011, Iss default, Pp 871-876 (2011)
institution DOAJ
collection DOAJ
language EN
topic Ophthalmology
RE1-994
spellingShingle Ophthalmology
RE1-994
Almubrad T
Osuagwu U
Al Abbadi I
Ogbuehi KC
Comparison of the precision of the Topcon SP-3000P specular microscope and an ultrasound pachymeter
description Turki M Almubrad, Uchechukwu L Osuagwu, Ibrahim AlAbbadi, Kelechi C OgbuehiCornea Research Chair, Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi ArabiaAim: To compare the precision of the Topcon SP-3000P noncontact specular microscope (NCSM) and the DGH 500 ultrasound pachymeter (USP).Methods: Triplicate measurements of central corneal thickness (CCT) for 100 eyes were taken with an NCSM and a USP in 2 visits separated by 1 week. Repeatability was assessed by computing the differences between all 3 readings from each subject. Coefficients of repeatability and reproducibility were computed.Results: Mean CCT as measured by each instrument were: 518.53 ± 34.96 µm (range 417.33–592.67) and 516.94 ± 33.60 µm (range 431.67–582.67) for sessions 1 and 2 respectively, with the NCSM; 546.69 ± 36.62 µm (range 457.33–617.00) and 549.78 ± 35.26 µm (range 454.00–618.67) for sessions 1 and 2 respectively, with the USP. The ultrasound CCT measurements were consistently higher than those obtained with the NCSM in both sessions 28.17 ± 19.20 µm (mean ± SD, session 1) and 32.81 ± 14.04 (mean ± SD, session 2). The repeatability coefficient for the NCSM was better in both sessions than those for USP (±10 µm vs ± 12 µm in session 1 and ±8 µm vs ±10 µm in session 2). The reproducibility coefficient with the NCSM was half that with the USP (±21 µm vs ±41 µm).Conclusion: The SP-3000P NCSM is a more precise and reproducible instrument for measurement of CCT than the USP, but both instruments are reliable, useful instruments for measuring CCT.Keywords: cornea, Topcon SP-3000P, ultrasound pachymetry, repeatability coefficient, reproducibility coefficient
format article
author Almubrad T
Osuagwu U
Al Abbadi I
Ogbuehi KC
author_facet Almubrad T
Osuagwu U
Al Abbadi I
Ogbuehi KC
author_sort Almubrad T
title Comparison of the precision of the Topcon SP-3000P specular microscope and an ultrasound pachymeter
title_short Comparison of the precision of the Topcon SP-3000P specular microscope and an ultrasound pachymeter
title_full Comparison of the precision of the Topcon SP-3000P specular microscope and an ultrasound pachymeter
title_fullStr Comparison of the precision of the Topcon SP-3000P specular microscope and an ultrasound pachymeter
title_full_unstemmed Comparison of the precision of the Topcon SP-3000P specular microscope and an ultrasound pachymeter
title_sort comparison of the precision of the topcon sp-3000p specular microscope and an ultrasound pachymeter
publisher Dove Medical Press
publishDate 2011
url https://doaj.org/article/2935c3ced97d48bc883423687d78c6c4
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