Ex vivo Evaluation of Tono-Pen and Pneumotonometry in Cat Eyes
Purpose: To evaluate the validity and intraobserver reliability of intraocular pressure (IOP) measurements with both pneumotonometry and the Tono-Pen in a closed ex vivo system in cat eyes. Methods: IOP was increased step by step in 5 enucleated cat eyes, while taking IOP measurements with the Tono-...
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| Veröffentlicht in: | Ophthalmic research 2006-01, Vol.38 (1), p.13-18 |
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| creator | Stoiber, Josef Fernandez, Viviana Lamar, Peggy D. Hitzl, Wolfgang Fantes, Francisco Parel, Jean-Marie |
| description | Purpose: To evaluate the validity and intraobserver reliability of intraocular pressure (IOP) measurements with both pneumotonometry and the Tono-Pen in a closed ex vivo system in cat eyes. Methods: IOP was increased step by step in 5 enucleated cat eyes, while taking IOP measurements with the Tono-Pen and pneumotonometry. The outcomes were compared to readings of a digital manometer simultaneously measuring the actual pressure in the anterior chamber. Results: Pneumotonometry overestimated IOP below 15 mm Hg and underestimated pressures above 20 mm Hg. Tono-Pen tonometry considerably underestimated IOP over the whole spectrum in all of the eyes tested. The pneumotonometer was identified as the more valid and reliable instrument for cat eyes. Conclusion: Both tonometers are clinically useful tools to assess IOP for glaucoma studies using a cat animal model. However, one has to consider underestimation of IOP in the upper ranges. A correction formula can be used to calculate the actual IOP. |
| doi_str_mv | 10.1159/000088492 |
| format | Article |
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Methods: IOP was increased step by step in 5 enucleated cat eyes, while taking IOP measurements with the Tono-Pen and pneumotonometry. The outcomes were compared to readings of a digital manometer simultaneously measuring the actual pressure in the anterior chamber. Results: Pneumotonometry overestimated IOP below 15 mm Hg and underestimated pressures above 20 mm Hg. Tono-Pen tonometry considerably underestimated IOP over the whole spectrum in all of the eyes tested. The pneumotonometer was identified as the more valid and reliable instrument for cat eyes. Conclusion: Both tonometers are clinically useful tools to assess IOP for glaucoma studies using a cat animal model. However, one has to consider underestimation of IOP in the upper ranges. A correction formula can be used to calculate the actual IOP.</description><identifier>ISSN: 0030-3747</identifier><identifier>EISSN: 1423-0259</identifier><identifier>DOI: 10.1159/000088492</identifier><identifier>PMID: 16192743</identifier><language>eng</language><publisher>Basel, Switzerland: S. Karger AG</publisher><subject>Animals ; Anterior Chamber - physiology ; Cats ; Diagnosis, Computer-Assisted ; Equipment Design ; Intraocular Pressure ; Manometry ; Observer Variation ; Original Paper ; Reproducibility of Results ; Tonometry, Ocular - instrumentation ; Tonometry, Ocular - standards</subject><ispartof>Ophthalmic research, 2006-01, Vol.38 (1), p.13-18</ispartof><rights>2006 S. Karger AG, Basel</rights><rights>Copyright (c) 2006 S. Karger AG, Basel</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c330t-f45ee977c026b7867d5bcb572a99d2afa88432d9bbdf33be779960ae0f938dda3</citedby><cites>FETCH-LOGICAL-c330t-f45ee977c026b7867d5bcb572a99d2afa88432d9bbdf33be779960ae0f938dda3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,2423,27901,27902</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/16192743$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Stoiber, Josef</creatorcontrib><creatorcontrib>Fernandez, Viviana</creatorcontrib><creatorcontrib>Lamar, Peggy D.</creatorcontrib><creatorcontrib>Hitzl, Wolfgang</creatorcontrib><creatorcontrib>Fantes, Francisco</creatorcontrib><creatorcontrib>Parel, Jean-Marie</creatorcontrib><title>Ex vivo Evaluation of Tono-Pen and Pneumotonometry in Cat Eyes</title><title>Ophthalmic research</title><addtitle>Ophthalmic Res</addtitle><description>Purpose: To evaluate the validity and intraobserver reliability of intraocular pressure (IOP) measurements with both pneumotonometry and the Tono-Pen in a closed ex vivo system in cat eyes. Methods: IOP was increased step by step in 5 enucleated cat eyes, while taking IOP measurements with the Tono-Pen and pneumotonometry. The outcomes were compared to readings of a digital manometer simultaneously measuring the actual pressure in the anterior chamber. Results: Pneumotonometry overestimated IOP below 15 mm Hg and underestimated pressures above 20 mm Hg. Tono-Pen tonometry considerably underestimated IOP over the whole spectrum in all of the eyes tested. The pneumotonometer was identified as the more valid and reliable instrument for cat eyes. Conclusion: Both tonometers are clinically useful tools to assess IOP for glaucoma studies using a cat animal model. However, one has to consider underestimation of IOP in the upper ranges. A correction formula can be used to calculate the actual IOP.</description><subject>Animals</subject><subject>Anterior Chamber - physiology</subject><subject>Cats</subject><subject>Diagnosis, Computer-Assisted</subject><subject>Equipment Design</subject><subject>Intraocular Pressure</subject><subject>Manometry</subject><subject>Observer Variation</subject><subject>Original Paper</subject><subject>Reproducibility of Results</subject><subject>Tonometry, Ocular - instrumentation</subject><subject>Tonometry, Ocular - standards</subject><issn>0030-3747</issn><issn>1423-0259</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>BENPR</sourceid><recordid>eNpd0E1LxDAQBuAgirt-HDwLEjwIHqrTpE2aiyBL_YAF97CeS9qk0rVN1qRd3H9vpMsKzmVgeGYYXoQuYriL41TcQ6gsSwQ5QNM4ITQCkopDNAWgEFGe8Ak68X4FELCAYzSJWSwIT-gUPeTfeNNsLM43sh1k31iDbY2X1thooQ2WRuGF0UNn-zDqdO-2uDF4Jnucb7U_Q0e1bL0-3_VT9P6UL2cv0fzt-XX2OI8qSqGP6iTVWnBeAWElzxhXaVmVKSdSCEVkLcP3lChRlqqmtNScC8FAaqgFzZSS9BTdjHfXzn4N2vdF1_hKt6002g6-YDzlGWQswOt_cGUHZ8JvBSEJSznjENDtiCpnvXe6Ltau6aTbFjEUv4kW-0SDvdodHMpOqz-5izCAyxF8Sveh3R6M6z83r3ed</recordid><startdate>20060101</startdate><enddate>20060101</enddate><creator>Stoiber, Josef</creator><creator>Fernandez, Viviana</creator><creator>Lamar, Peggy D.</creator><creator>Hitzl, Wolfgang</creator><creator>Fantes, Francisco</creator><creator>Parel, Jean-Marie</creator><general>S. 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physiology</topic><topic>Cats</topic><topic>Diagnosis, Computer-Assisted</topic><topic>Equipment Design</topic><topic>Intraocular Pressure</topic><topic>Manometry</topic><topic>Observer Variation</topic><topic>Original Paper</topic><topic>Reproducibility of Results</topic><topic>Tonometry, Ocular - instrumentation</topic><topic>Tonometry, Ocular - standards</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Stoiber, Josef</creatorcontrib><creatorcontrib>Fernandez, Viviana</creatorcontrib><creatorcontrib>Lamar, Peggy D.</creatorcontrib><creatorcontrib>Hitzl, Wolfgang</creatorcontrib><creatorcontrib>Fantes, Francisco</creatorcontrib><creatorcontrib>Parel, Jean-Marie</creatorcontrib><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>Bacteriology Abstracts (Microbiology B)</collection><collection>Industrial and Applied Microbiology Abstracts (Microbiology A)</collection><collection>Virology and AIDS 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>Technology Research Database</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</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ProQuest One Community College</collection><collection>Engineering Research Database</collection><collection>Health Research Premium Collection</collection><collection>Health Research Premium Collection (Alumni)</collection><collection>AIDS and Cancer Research Abstracts</collection><collection>ProQuest Health & Medical Complete (Alumni)</collection><collection>Health & Medical Collection (Alumni Edition)</collection><collection>Medical Database</collection><collection>Algology Mycology and Protozoology Abstracts (Microbiology C)</collection><collection>Biotechnology and BioEngineering Abstracts</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central China</collection><collection>MEDLINE - Academic</collection><jtitle>Ophthalmic research</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Stoiber, Josef</au><au>Fernandez, Viviana</au><au>Lamar, Peggy D.</au><au>Hitzl, Wolfgang</au><au>Fantes, Francisco</au><au>Parel, Jean-Marie</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Ex vivo Evaluation of Tono-Pen and Pneumotonometry in Cat Eyes</atitle><jtitle>Ophthalmic research</jtitle><addtitle>Ophthalmic Res</addtitle><date>2006-01-01</date><risdate>2006</risdate><volume>38</volume><issue>1</issue><spage>13</spage><epage>18</epage><pages>13-18</pages><issn>0030-3747</issn><eissn>1423-0259</eissn><abstract>Purpose: To evaluate the validity and intraobserver reliability of intraocular pressure (IOP) measurements with both pneumotonometry and the Tono-Pen in a closed ex vivo system in cat eyes. Methods: IOP was increased step by step in 5 enucleated cat eyes, while taking IOP measurements with the Tono-Pen and pneumotonometry. The outcomes were compared to readings of a digital manometer simultaneously measuring the actual pressure in the anterior chamber. Results: Pneumotonometry overestimated IOP below 15 mm Hg and underestimated pressures above 20 mm Hg. Tono-Pen tonometry considerably underestimated IOP over the whole spectrum in all of the eyes tested. The pneumotonometer was identified as the more valid and reliable instrument for cat eyes. Conclusion: Both tonometers are clinically useful tools to assess IOP for glaucoma studies using a cat animal model. However, one has to consider underestimation of IOP in the upper ranges. A correction formula can be used to calculate the actual IOP.</abstract><cop>Basel, Switzerland</cop><pub>S. Karger AG</pub><pmid>16192743</pmid><doi>10.1159/000088492</doi><tpages>6</tpages></addata></record> |
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| subjects | Animals Anterior Chamber - physiology Cats Diagnosis, Computer-Assisted Equipment Design Intraocular Pressure Manometry Observer Variation Original Paper Reproducibility of Results Tonometry, Ocular - instrumentation Tonometry, Ocular - standards |
| title | Ex vivo Evaluation of Tono-Pen and Pneumotonometry in Cat Eyes |
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