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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| Format: | Article |
| Language: | English |
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Dove Medical Press
2011-06-01
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| Series: | Clinical Ophthalmology |
| Online Access: | http://www.dovepress.com/comparison-of-the-precision-of-the-topcon-sp-3000p-specular-microscope-a7729 |
| _version_ | 1818574083121479680 |
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| 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 |
| collection | DOAJ |
| 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 |
| first_indexed | 2024-12-15T00:21:43Z |
| format | Article |
| id | doaj.art-2935c3ced97d48bc883423687d78c6c4 |
| institution | Directory Open Access Journal |
| issn | 1177-5467 1177-5483 |
| language | English |
| last_indexed | 2024-12-15T00:21:43Z |
| publishDate | 2011-06-01 |
| publisher | Dove Medical Press |
| record_format | Article |
| series | Clinical Ophthalmology |
| spelling | doaj.art-2935c3ced97d48bc883423687d78c6c42022-12-21T22:42:17ZengDove Medical PressClinical Ophthalmology1177-54671177-54832011-06-012011default871876Comparison of the precision of the Topcon SP-3000P specular microscope and an ultrasound pachymeterAlmubrad TOsuagwu UAl Abbadi IOgbuehi KCTurki 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 coefficienthttp://www.dovepress.com/comparison-of-the-precision-of-the-topcon-sp-3000p-specular-microscope-a7729 |
| spellingShingle | Almubrad T Osuagwu U Al Abbadi I Ogbuehi KC Comparison of the precision of the Topcon SP-3000P specular microscope and an ultrasound pachymeter Clinical Ophthalmology |
| title | 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_short | 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 |
| url | http://www.dovepress.com/comparison-of-the-precision-of-the-topcon-sp-3000p-specular-microscope-a7729 |
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