Varying Effects of Corneal Thickness on Intraocular Pressure Measurements with Different Tonometers
Aims To compare the intraocular pressure (IOP) measurements using the Goldmann applanation tonometer (GAT), noncontact tonometer (NCT), and ocular blood flow tonometer (OBFT), and to evaluate the effects of varying central corneal thickness (CCT) on the readings. Methods Ultrasound pachymetry and to...
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| Veröffentlicht in: | Eye (London) 2005-03, Vol.19 (3), p.327-332 |
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| creator | Ko, Y-C Liu, CJ-l Hsu, W-M |
| description | Aims
To compare the intraocular pressure (IOP) measurements using the Goldmann applanation tonometer (GAT), noncontact tonometer (NCT), and ocular blood flow tonometer (OBFT), and to evaluate the effects of varying central corneal thickness (CCT) on the readings.
Methods
Ultrasound pachymetry and tonometry were performed on 170 eyes. Using the corrected GAT values that took CCT into account as the standard, we calculated the NCT and OBFT measurement errors related to the CCT variable by a linear regression model. Group comparisons were performed with the
χ
2
test and one-way ANOVA test. The correlation between the various tonometer measurements was analysed by Pearson's correlation method.
Results
Both the NCT (
r
=0.872,
P |
| doi_str_mv | 10.1038/sj.eye.6701458 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_67478353</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>971591261</sourcerecordid><originalsourceid>FETCH-LOGICAL-c452t-a844b88c30e52804a01da0596105a3644af04f0c95cd877650424d379e6ef7f73</originalsourceid><addsrcrecordid>eNp1kc9rFDEUx0OptGv12ltLEPQ22_xO5ihr1UJFD6t4C2n2pZ3tTFKTGaT_vSk7ulDw9Mh7n-_3Pb5B6JSSJSXcXJTtEh5hqTShQpoDtKBCq0YKKQ7RgrSSNIyxn8foZSlbUhmtyRE6ppJJowhfIP_D5ccu3uLLEMCPBaeAVylHcD1e33X-PkKpzYiv4phd8lPvMv6Wa3PKgL-Ae6oDxKr83Y13-ENXfXJ943WKaYARcnmFXgTXF3g91xP0_ePlevW5uf766Wr1_rrxQrKxcUaIG2M8JyCZIcIRunFEtooS6bgSwgUiAvGt9BujtZJEMLHhugUFQQfNT9C7ne9DTr8mKKMduuKh712ENBWrtNCGS17BN8_AbZpyrLdZRg1vuWGsQssd5HMqJUOwD7kbalqWEvuUvS1bW7O3c_ZVcD67TjcDbPb4HHYF3s6AK971Ibvou7LnlDSilapyFzuu1FG8hbw_77-rz3aK6Mb6H_8s_87_AOqWpss</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>218393822</pqid></control><display><type>article</type><title>Varying Effects of Corneal Thickness on Intraocular Pressure Measurements with Different Tonometers</title><source>MEDLINE</source><source>EZB-FREE-00999 freely available EZB journals</source><source>Alma/SFX Local Collection</source><creator>Ko, Y-C ; Liu, CJ-l ; Hsu, W-M</creator><creatorcontrib>Ko, Y-C ; Liu, CJ-l ; Hsu, W-M</creatorcontrib><description>Aims
To compare the intraocular pressure (IOP) measurements using the Goldmann applanation tonometer (GAT), noncontact tonometer (NCT), and ocular blood flow tonometer (OBFT), and to evaluate the effects of varying central corneal thickness (CCT) on the readings.
Methods
Ultrasound pachymetry and tonometry were performed on 170 eyes. Using the corrected GAT values that took CCT into account as the standard, we calculated the NCT and OBFT measurement errors related to the CCT variable by a linear regression model. Group comparisons were performed with the
χ
2
test and one-way ANOVA test. The correlation between the various tonometer measurements was analysed by Pearson's correlation method.
Results
Both the NCT (
r
=0.872,
P
<0.001) and OBFT measurements (
r
=0.861,
P
<0.001) were highly correlated with the GAT measurements. IOP measurements using the three tonometers were all correlated with CCT (all
P
<0.001), with the NCT measurements showing the greatest regression coefficient (
β
=0.063,
r
=0.650) and the GAT measurements the least (
β
=0.037,
r
=0.496). A linear regression model indicated that a 10
μ
m change in CCT resulted in a NCT measurement deviation of 0.47–0.98 mmHg and an OBFT measurement deviation of 0.29–0.81 mmHg.
Conclusion
Pressure readings with the GAT, NCT, and OBFT are all affected by CCT, with the NCT being the one most affected and the GAT the least. Our findings suggest CCT an essential variable to consider in interpreting IOP readings, especially for the NCT measurements.</description><identifier>ISSN: 0950-222X</identifier><identifier>EISSN: 1476-5454</identifier><identifier>DOI: 10.1038/sj.eye.6701458</identifier><identifier>PMID: 15258603</identifier><identifier>CODEN: EYEEEC</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>Adult ; Aged ; Analysis of Variance ; Biological and medical sciences ; clinical-study ; Cornea - pathology ; Female ; Glaucoma - diagnosis ; Glaucoma - pathology ; Glaucoma - physiopathology ; Humans ; Intraocular Pressure ; Investigative techniques of ocular function and vision ; Investigative techniques, diagnostic techniques (general aspects) ; Laboratory Medicine ; Linear Models ; Male ; Medical sciences ; Medicine & Public Health ; Middle Aged ; Ocular Hypertension - diagnosis ; Ocular Hypertension - pathology ; Ocular Hypertension - physiopathology ; Ophthalmology ; Pharmaceutical Sciences/Technology ; Reproducibility of Results ; Surgery ; Surgical Oncology ; Tonometry, Ocular - instrumentation ; Tonometry, Ocular - methods</subject><ispartof>Eye (London), 2005-03, Vol.19 (3), p.327-332</ispartof><rights>Royal College of Ophthalmologists 2005</rights><rights>2005 INIST-CNRS</rights><rights>Copyright Nature Publishing Group Mar 2005</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c452t-a844b88c30e52804a01da0596105a3644af04f0c95cd877650424d379e6ef7f73</citedby><cites>FETCH-LOGICAL-c452t-a844b88c30e52804a01da0596105a3644af04f0c95cd877650424d379e6ef7f73</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=16584956$$DView record in Pascal Francis$$Hfree_for_read</backlink><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/15258603$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Ko, Y-C</creatorcontrib><creatorcontrib>Liu, CJ-l</creatorcontrib><creatorcontrib>Hsu, W-M</creatorcontrib><title>Varying Effects of Corneal Thickness on Intraocular Pressure Measurements with Different Tonometers</title><title>Eye (London)</title><addtitle>Eye</addtitle><addtitle>Eye (Lond)</addtitle><description>Aims
To compare the intraocular pressure (IOP) measurements using the Goldmann applanation tonometer (GAT), noncontact tonometer (NCT), and ocular blood flow tonometer (OBFT), and to evaluate the effects of varying central corneal thickness (CCT) on the readings.
Methods
Ultrasound pachymetry and tonometry were performed on 170 eyes. Using the corrected GAT values that took CCT into account as the standard, we calculated the NCT and OBFT measurement errors related to the CCT variable by a linear regression model. Group comparisons were performed with the
χ
2
test and one-way ANOVA test. The correlation between the various tonometer measurements was analysed by Pearson's correlation method.
Results
Both the NCT (
r
=0.872,
P
<0.001) and OBFT measurements (
r
=0.861,
P
<0.001) were highly correlated with the GAT measurements. IOP measurements using the three tonometers were all correlated with CCT (all
P
<0.001), with the NCT measurements showing the greatest regression coefficient (
β
=0.063,
r
=0.650) and the GAT measurements the least (
β
=0.037,
r
=0.496). A linear regression model indicated that a 10
μ
m change in CCT resulted in a NCT measurement deviation of 0.47–0.98 mmHg and an OBFT measurement deviation of 0.29–0.81 mmHg.
Conclusion
Pressure readings with the GAT, NCT, and OBFT are all affected by CCT, with the NCT being the one most affected and the GAT the least. Our findings suggest CCT an essential variable to consider in interpreting IOP readings, especially for the NCT measurements.</description><subject>Adult</subject><subject>Aged</subject><subject>Analysis of Variance</subject><subject>Biological and medical sciences</subject><subject>clinical-study</subject><subject>Cornea - pathology</subject><subject>Female</subject><subject>Glaucoma - diagnosis</subject><subject>Glaucoma - pathology</subject><subject>Glaucoma - physiopathology</subject><subject>Humans</subject><subject>Intraocular Pressure</subject><subject>Investigative techniques of ocular function and vision</subject><subject>Investigative techniques, diagnostic techniques (general aspects)</subject><subject>Laboratory Medicine</subject><subject>Linear Models</subject><subject>Male</subject><subject>Medical sciences</subject><subject>Medicine & Public Health</subject><subject>Middle Aged</subject><subject>Ocular Hypertension - diagnosis</subject><subject>Ocular Hypertension - pathology</subject><subject>Ocular Hypertension - physiopathology</subject><subject>Ophthalmology</subject><subject>Pharmaceutical Sciences/Technology</subject><subject>Reproducibility of Results</subject><subject>Surgery</subject><subject>Surgical Oncology</subject><subject>Tonometry, Ocular - instrumentation</subject><subject>Tonometry, Ocular - methods</subject><issn>0950-222X</issn><issn>1476-5454</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2005</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNp1kc9rFDEUx0OptGv12ltLEPQ22_xO5ihr1UJFD6t4C2n2pZ3tTFKTGaT_vSk7ulDw9Mh7n-_3Pb5B6JSSJSXcXJTtEh5hqTShQpoDtKBCq0YKKQ7RgrSSNIyxn8foZSlbUhmtyRE6ppJJowhfIP_D5ccu3uLLEMCPBaeAVylHcD1e33X-PkKpzYiv4phd8lPvMv6Wa3PKgL-Ae6oDxKr83Y13-ENXfXJ943WKaYARcnmFXgTXF3g91xP0_ePlevW5uf766Wr1_rrxQrKxcUaIG2M8JyCZIcIRunFEtooS6bgSwgUiAvGt9BujtZJEMLHhugUFQQfNT9C7ne9DTr8mKKMduuKh712ENBWrtNCGS17BN8_AbZpyrLdZRg1vuWGsQssd5HMqJUOwD7kbalqWEvuUvS1bW7O3c_ZVcD67TjcDbPb4HHYF3s6AK971Ibvou7LnlDSilapyFzuu1FG8hbw_77-rz3aK6Mb6H_8s_87_AOqWpss</recordid><startdate>20050301</startdate><enddate>20050301</enddate><creator>Ko, Y-C</creator><creator>Liu, CJ-l</creator><creator>Hsu, W-M</creator><general>Nature Publishing Group UK</general><general>Nature Publishing Group</general><scope>IQODW</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7TK</scope><scope>7X7</scope><scope>7XB</scope><scope>88E</scope><scope>8AO</scope><scope>8FE</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>LK8</scope><scope>M0S</scope><scope>M1P</scope><scope>M7P</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>7X8</scope></search><sort><creationdate>20050301</creationdate><title>Varying Effects of Corneal Thickness on Intraocular Pressure Measurements with Different Tonometers</title><author>Ko, Y-C ; Liu, CJ-l ; Hsu, W-M</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c452t-a844b88c30e52804a01da0596105a3644af04f0c95cd877650424d379e6ef7f73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2005</creationdate><topic>Adult</topic><topic>Aged</topic><topic>Analysis of Variance</topic><topic>Biological and medical sciences</topic><topic>clinical-study</topic><topic>Cornea - pathology</topic><topic>Female</topic><topic>Glaucoma - diagnosis</topic><topic>Glaucoma - pathology</topic><topic>Glaucoma - physiopathology</topic><topic>Humans</topic><topic>Intraocular Pressure</topic><topic>Investigative techniques of ocular function and vision</topic><topic>Investigative techniques, diagnostic techniques (general aspects)</topic><topic>Laboratory Medicine</topic><topic>Linear Models</topic><topic>Male</topic><topic>Medical sciences</topic><topic>Medicine & Public Health</topic><topic>Middle Aged</topic><topic>Ocular Hypertension - diagnosis</topic><topic>Ocular Hypertension - pathology</topic><topic>Ocular Hypertension - physiopathology</topic><topic>Ophthalmology</topic><topic>Pharmaceutical Sciences/Technology</topic><topic>Reproducibility of Results</topic><topic>Surgery</topic><topic>Surgical Oncology</topic><topic>Tonometry, Ocular - instrumentation</topic><topic>Tonometry, Ocular - methods</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ko, Y-C</creatorcontrib><creatorcontrib>Liu, CJ-l</creatorcontrib><creatorcontrib>Hsu, W-M</creatorcontrib><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Neurosciences Abstracts</collection><collection>Health & Medical Collection</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Medical Database (Alumni Edition)</collection><collection>ProQuest Pharma Collection</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Natural Science Collection</collection><collection>Hospital Premium Collection</collection><collection>Hospital Premium Collection (Alumni Edition)</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>Biological Science Collection</collection><collection>ProQuest Central</collection><collection>Natural Science Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>Health Research Premium Collection</collection><collection>Health Research Premium Collection (Alumni)</collection><collection>ProQuest Central Student</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Health & Medical Complete (Alumni)</collection><collection>ProQuest Biological Science Collection</collection><collection>Health & Medical Collection (Alumni Edition)</collection><collection>Medical Database</collection><collection>Biological Science Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>MEDLINE - Academic</collection><jtitle>Eye (London)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ko, Y-C</au><au>Liu, CJ-l</au><au>Hsu, W-M</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Varying Effects of Corneal Thickness on Intraocular Pressure Measurements with Different Tonometers</atitle><jtitle>Eye (London)</jtitle><stitle>Eye</stitle><addtitle>Eye (Lond)</addtitle><date>2005-03-01</date><risdate>2005</risdate><volume>19</volume><issue>3</issue><spage>327</spage><epage>332</epage><pages>327-332</pages><issn>0950-222X</issn><eissn>1476-5454</eissn><coden>EYEEEC</coden><abstract>Aims
To compare the intraocular pressure (IOP) measurements using the Goldmann applanation tonometer (GAT), noncontact tonometer (NCT), and ocular blood flow tonometer (OBFT), and to evaluate the effects of varying central corneal thickness (CCT) on the readings.
Methods
Ultrasound pachymetry and tonometry were performed on 170 eyes. Using the corrected GAT values that took CCT into account as the standard, we calculated the NCT and OBFT measurement errors related to the CCT variable by a linear regression model. Group comparisons were performed with the
χ
2
test and one-way ANOVA test. The correlation between the various tonometer measurements was analysed by Pearson's correlation method.
Results
Both the NCT (
r
=0.872,
P
<0.001) and OBFT measurements (
r
=0.861,
P
<0.001) were highly correlated with the GAT measurements. IOP measurements using the three tonometers were all correlated with CCT (all
P
<0.001), with the NCT measurements showing the greatest regression coefficient (
β
=0.063,
r
=0.650) and the GAT measurements the least (
β
=0.037,
r
=0.496). A linear regression model indicated that a 10
μ
m change in CCT resulted in a NCT measurement deviation of 0.47–0.98 mmHg and an OBFT measurement deviation of 0.29–0.81 mmHg.
Conclusion
Pressure readings with the GAT, NCT, and OBFT are all affected by CCT, with the NCT being the one most affected and the GAT the least. Our findings suggest CCT an essential variable to consider in interpreting IOP readings, especially for the NCT measurements.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><pmid>15258603</pmid><doi>10.1038/sj.eye.6701458</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
| fulltext | fulltext |
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| ispartof | Eye (London), 2005-03, Vol.19 (3), p.327-332 |
| issn | 0950-222X 1476-5454 |
| language | eng |
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| source | MEDLINE; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | Adult Aged Analysis of Variance Biological and medical sciences clinical-study Cornea - pathology Female Glaucoma - diagnosis Glaucoma - pathology Glaucoma - physiopathology Humans Intraocular Pressure Investigative techniques of ocular function and vision Investigative techniques, diagnostic techniques (general aspects) Laboratory Medicine Linear Models Male Medical sciences Medicine & Public Health Middle Aged Ocular Hypertension - diagnosis Ocular Hypertension - pathology Ocular Hypertension - physiopathology Ophthalmology Pharmaceutical Sciences/Technology Reproducibility of Results Surgery Surgical Oncology Tonometry, Ocular - instrumentation Tonometry, Ocular - methods |
| title | Varying Effects of Corneal Thickness on Intraocular Pressure Measurements with Different Tonometers |
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