Performance of the PT100 noncontact tonometer in healthy eyes

Turki M AlMubradCornea Research Chair, Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh, Kingdom of Saudi ArabiaBackground: The purpose of this study was to assess the repeatability and reproducibility of the PT100 noncontact tonometer and to compare its con...

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Autor principal:	AlMubrad T
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2011
Materias:	Ophthalmology RE1-994
Acceso en línea:	https://doaj.org/article/454c8d70f32d4b05b1924751b9347968
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spelling	oai:doaj.org-article:454c8d70f32d4b05b1924751b93479682021-12-02T04:22:56ZPerformance of the PT100 noncontact tonometer in healthy eyes1177-54671177-5483https://doaj.org/article/454c8d70f32d4b05b1924751b93479682011-05-01T00:00:00Zhttp://www.dovepress.com/performance-of-the-pt100-noncontact-tonometer-in-healthy-eyes-a7498https://doaj.org/toc/1177-5467https://doaj.org/toc/1177-5483Turki M AlMubradCornea Research Chair, Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh, Kingdom of Saudi ArabiaBackground: The purpose of this study was to assess the repeatability and reproducibility of the PT100 noncontact tonometer and to compare its consistency with the Goldmann applanation tonometer (GAT) in measuring intraocular pressure (IOP).Methods: Triplicate IOP measurements were obtained on two separate occasions using the PT100 and GAT from randomly selected eyes in 66 healthy volunteers aged 22 &plusmn; 1 years. The repeatability and reproducibility of each techniques was assessed. Agreement between the techniques was statistically quantified using intrasession repeatability for each technique as the basis for comparison.Results: Both techniques returned equal IOP values in the first measurement session (15 &plusmn; 3 mmHg). The second session showed a mean difference in average IOP (1 &plusmn; 0.71). The 95% limits of agreement between the techniques were &ndash;5.2 to 5.5 mmHg and &ndash;4.0 to 4.7 mmHg (sessions 1 and 2, respectively). These mean differences were not statistically significant (P &gt; 0.05, paired t-test), with the PT100 underestimating IOP measurement by 1.00 mmHg. The mean intrasession IOP for GAT sessions 1 and 2 was 0 &plusmn; 0.90 mmHg and 0.04 &plusmn; 1.06 mmHg, respectively, and the corresponding mean IOP measurement difference for the PT100 was &ndash;0.06 &plusmn; 0.96 and &ndash;0.39 &plusmn; 0.94 mmHg (sessions 1 and 2, respectively; P &gt; 0.05, paired t-test). Repeatability coefficients for the GAT IOP measurements were 1.8 mmHg and 2.1 mmHg for sessions 1 and 2, while the PT100 repeatability coefficient was 1.9 mmHg and 1.8 mmHg for sessions 1 and 2, respectively. The intrasession repeatability coefficient of both techniques for test&ndash;retest differences were within &plusmn;5 mmHg.Conclusion: The PT100 noncontact tonometer produced greater repeatability than the GAT in assessment of IOP, whereas GAT resulted in more reproducible results. Both techniques showed a close level of agreement on comparison, with the PT100 underestimating IOP measurement by 1.0 mmHg only, although this was not clinically or statistically significant. Of importance is that the IOP measurements using these techniques could be interchangeable in the IOP range studied here.Keywords: Goldmann applanation tonometer, intraocular pressure, Reichert PT100, noncontact tonometer, repeatability, reproducibilityAlMubrad TDove Medical PressarticleOphthalmologyRE1-994ENClinical Ophthalmology, Vol 2011, Iss default, Pp 661-666 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Ophthalmology RE1-994
spellingShingle	Ophthalmology RE1-994 AlMubrad T Performance of the PT100 noncontact tonometer in healthy eyes
description	Turki M AlMubradCornea Research Chair, Department of Optometry, College of Applied Medical Sciences, King Saud University, Riyadh, Kingdom of Saudi ArabiaBackground: The purpose of this study was to assess the repeatability and reproducibility of the PT100 noncontact tonometer and to compare its consistency with the Goldmann applanation tonometer (GAT) in measuring intraocular pressure (IOP).Methods: Triplicate IOP measurements were obtained on two separate occasions using the PT100 and GAT from randomly selected eyes in 66 healthy volunteers aged 22 &plusmn; 1 years. The repeatability and reproducibility of each techniques was assessed. Agreement between the techniques was statistically quantified using intrasession repeatability for each technique as the basis for comparison.Results: Both techniques returned equal IOP values in the first measurement session (15 &plusmn; 3 mmHg). The second session showed a mean difference in average IOP (1 &plusmn; 0.71). The 95% limits of agreement between the techniques were &ndash;5.2 to 5.5 mmHg and &ndash;4.0 to 4.7 mmHg (sessions 1 and 2, respectively). These mean differences were not statistically significant (P &gt; 0.05, paired t-test), with the PT100 underestimating IOP measurement by 1.00 mmHg. The mean intrasession IOP for GAT sessions 1 and 2 was 0 &plusmn; 0.90 mmHg and 0.04 &plusmn; 1.06 mmHg, respectively, and the corresponding mean IOP measurement difference for the PT100 was &ndash;0.06 &plusmn; 0.96 and &ndash;0.39 &plusmn; 0.94 mmHg (sessions 1 and 2, respectively; P &gt; 0.05, paired t-test). Repeatability coefficients for the GAT IOP measurements were 1.8 mmHg and 2.1 mmHg for sessions 1 and 2, while the PT100 repeatability coefficient was 1.9 mmHg and 1.8 mmHg for sessions 1 and 2, respectively. The intrasession repeatability coefficient of both techniques for test&ndash;retest differences were within &plusmn;5 mmHg.Conclusion: The PT100 noncontact tonometer produced greater repeatability than the GAT in assessment of IOP, whereas GAT resulted in more reproducible results. Both techniques showed a close level of agreement on comparison, with the PT100 underestimating IOP measurement by 1.0 mmHg only, although this was not clinically or statistically significant. Of importance is that the IOP measurements using these techniques could be interchangeable in the IOP range studied here.Keywords: Goldmann applanation tonometer, intraocular pressure, Reichert PT100, noncontact tonometer, repeatability, reproducibility
format	article
author	AlMubrad T
author_facet	AlMubrad T
author_sort	AlMubrad T
title	Performance of the PT100 noncontact tonometer in healthy eyes
title_short	Performance of the PT100 noncontact tonometer in healthy eyes
title_full	Performance of the PT100 noncontact tonometer in healthy eyes
title_fullStr	Performance of the PT100 noncontact tonometer in healthy eyes
title_full_unstemmed	Performance of the PT100 noncontact tonometer in healthy eyes
title_sort	performance of the pt100 noncontact tonometer in healthy eyes
publisher	Dove Medical Press
publishDate	2011
url	https://doaj.org/article/454c8d70f32d4b05b1924751b9347968
work_keys_str_mv	AT almubradt performanceofthept100noncontacttonometerinhealthyeyes
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Performance of the PT100 noncontact tonometer in healthy eyes

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