Impact of chamber pressure and material properties on the deformation response of corneal models measured by dynamic ultra-high-speed Scheimpflug imaging
To study the deformation response of three distinct contact lenses with known structures, which served as corneal models, under different chamber pressures using ultra-high-speed (UHS) Scheimpflug imaging. Three hydrophilic contact lenses were mounted on a sealed water chamber with precisely adjusta...
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| Veröffentlicht in: | Arquivos brasileiros de oftalmologia 2013-10, Vol.76 (5), p.278-281 |
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| creator | Correia, Fernando Faria Ramos, Isaac Roberts, Cynthia J Steinmueller, Andreas Krug, Matthias Ambrósio, Jr, Renato |
| description | To study the deformation response of three distinct contact lenses with known structures, which served as corneal models, under different chamber pressures using ultra-high-speed (UHS) Scheimpflug imaging.
Three hydrophilic contact lenses were mounted on a sealed water chamber with precisely adjustable pressure: TAN-G5X (41% hydroxyethylmethacrylate/glycolmethacrylate, 550 µm thick), TAN-40 (62% hydroxyethylmethacrylate, 525 µm thick) and TAN-58 (42% methylmethacrylate, 258 µm thick). Each model was tested five times under different pressures (5, 15, 25, 35 and 45 mmHg), using ultra-high-speed Scheimpflug imaging during non-contact tonometry. 140 Scheimpflug images were taken with the UHS camera in each measurement. The deformation amplitude during non-contact tonometry was determined as the highest displacement of the apex at the highest concavity (HC) moment.
At each pressure level, the deformation amplitude was statistically different for each lens tested (p |
| doi_str_mv | 10.1590/S0004-27492013000500005 |
| format | Article |
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Three hydrophilic contact lenses were mounted on a sealed water chamber with precisely adjustable pressure: TAN-G5X (41% hydroxyethylmethacrylate/glycolmethacrylate, 550 µm thick), TAN-40 (62% hydroxyethylmethacrylate, 525 µm thick) and TAN-58 (42% methylmethacrylate, 258 µm thick). Each model was tested five times under different pressures (5, 15, 25, 35 and 45 mmHg), using ultra-high-speed Scheimpflug imaging during non-contact tonometry. 140 Scheimpflug images were taken with the UHS camera in each measurement. The deformation amplitude during non-contact tonometry was determined as the highest displacement of the apex at the highest concavity (HC) moment.
At each pressure level, the deformation amplitude was statistically different for each lens tested (p<0.001, ANOVA). Each lens had different deformation amplitudes under different pressure levels (p<0.001; Bonferroni post-hoc test). The thicker lens with less polymer (TAN-G5X) had a higher deformation (less stiff behavior) than the one that was thinner but with more polymer (TAN-40), when measured at the same internal pressure. The thinnest lens with less polymers (TAN-58) had a lower deformation amplitude (stiffer behavior) at higher pressures than the thicker ones with more polymer (TAN-40 and TAN-G5X) at lower pressures.
UHS Scheimpflug imaging allowed for biomechanical assessment through deformation characterization of corneal models. Biomechanical behavior was more influenced by material composition than by thickness. Chamber pressure had a significant impact on deformation response of each lens.</description><identifier>ISSN: 0004-2749</identifier><identifier>ISSN: 1678-2925</identifier><identifier>EISSN: 1678-2925</identifier><identifier>DOI: 10.1590/S0004-27492013000500005</identifier><identifier>PMID: 24232940</identifier><language>eng</language><publisher>Brazil: Conselho Brasileiro de Oftalmologia</publisher><subject>Air Pressure ; Analysis of Variance ; Biomechanical Phenomena ; Contact Lenses - standards ; Cornea - physiology ; Cornea - surgery ; Corneal Pachymetry - methods ; Image Processing, Computer-Assisted - methods ; Manometry - methods ; Models, Biological ; OPHTHALMOLOGY</subject><ispartof>Arquivos brasileiros de oftalmologia, 2013-10, Vol.76 (5), p.278-281</ispartof><rights>This work is licensed under a Creative Commons Attribution 4.0 International License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c331t-6322b657e1eb00b239e300ccd75f202926a033d5814a139fa8055f43708a49d83</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885,27924,27925</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/24232940$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Correia, Fernando Faria</creatorcontrib><creatorcontrib>Ramos, Isaac</creatorcontrib><creatorcontrib>Roberts, Cynthia J</creatorcontrib><creatorcontrib>Steinmueller, Andreas</creatorcontrib><creatorcontrib>Krug, Matthias</creatorcontrib><creatorcontrib>Ambrósio, Jr, Renato</creatorcontrib><title>Impact of chamber pressure and material properties on the deformation response of corneal models measured by dynamic ultra-high-speed Scheimpflug imaging</title><title>Arquivos brasileiros de oftalmologia</title><addtitle>Arq Bras Oftalmol</addtitle><description>To study the deformation response of three distinct contact lenses with known structures, which served as corneal models, under different chamber pressures using ultra-high-speed (UHS) Scheimpflug imaging.
Three hydrophilic contact lenses were mounted on a sealed water chamber with precisely adjustable pressure: TAN-G5X (41% hydroxyethylmethacrylate/glycolmethacrylate, 550 µm thick), TAN-40 (62% hydroxyethylmethacrylate, 525 µm thick) and TAN-58 (42% methylmethacrylate, 258 µm thick). Each model was tested five times under different pressures (5, 15, 25, 35 and 45 mmHg), using ultra-high-speed Scheimpflug imaging during non-contact tonometry. 140 Scheimpflug images were taken with the UHS camera in each measurement. The deformation amplitude during non-contact tonometry was determined as the highest displacement of the apex at the highest concavity (HC) moment.
At each pressure level, the deformation amplitude was statistically different for each lens tested (p<0.001, ANOVA). Each lens had different deformation amplitudes under different pressure levels (p<0.001; Bonferroni post-hoc test). The thicker lens with less polymer (TAN-G5X) had a higher deformation (less stiff behavior) than the one that was thinner but with more polymer (TAN-40), when measured at the same internal pressure. The thinnest lens with less polymers (TAN-58) had a lower deformation amplitude (stiffer behavior) at higher pressures than the thicker ones with more polymer (TAN-40 and TAN-G5X) at lower pressures.
UHS Scheimpflug imaging allowed for biomechanical assessment through deformation characterization of corneal models. Biomechanical behavior was more influenced by material composition than by thickness. Chamber pressure had a significant impact on deformation response of each lens.</description><subject>Air Pressure</subject><subject>Analysis of Variance</subject><subject>Biomechanical Phenomena</subject><subject>Contact Lenses - standards</subject><subject>Cornea - physiology</subject><subject>Cornea - surgery</subject><subject>Corneal Pachymetry - methods</subject><subject>Image Processing, Computer-Assisted - methods</subject><subject>Manometry - methods</subject><subject>Models, Biological</subject><subject>OPHTHALMOLOGY</subject><issn>0004-2749</issn><issn>1678-2925</issn><issn>1678-2925</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNp9Uc1u1DAQtioquhReofjIJWX8l8RHVFGoVIlDyzly7MnGVRwHOznso_C2eLulFyQuMxrP9yN_Q8hHBtdMafj8AACy4o3UHJgog4JjOSM7VjdtxTVXb8juFXRB3uX8BMCl1uotueCSC64l7Mjvu7AYu9I4UDua0GOiS8Kct4TUzI4Gs2LyZiqvccG0esw0znQdkTocYip7X-ZCWeKc8VknphkLI0SHU6YBzVHN0f5A3WE2wVu6TWsy1ej3Y5UXLLsHO6IPyzBte-qD2ft5_56cD2bK-OGlX5Kft18fb75X9z--3d18ua-sEGytasF5X6sGGfYAPRcaSx7WukYNHEoQtQEhnGqZNEzowbSg1CBFA62R2rXiklyfdLP1OMXuKW5pLobdc8bdPxkXwqcToUTya8O8dsFni9NkZoxb7phUmtWMNbJAmxPUpphzwqFbUvleOnQMuuMh_2Ny9WKy9QHdK-_v5cQf9oKYJQ</recordid><startdate>20131001</startdate><enddate>20131001</enddate><creator>Correia, Fernando Faria</creator><creator>Ramos, Isaac</creator><creator>Roberts, Cynthia J</creator><creator>Steinmueller, Andreas</creator><creator>Krug, Matthias</creator><creator>Ambrósio, Jr, Renato</creator><general>Conselho Brasileiro de Oftalmologia</general><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>7X8</scope><scope>GPN</scope></search><sort><creationdate>20131001</creationdate><title>Impact of chamber pressure and material properties on the deformation response of corneal models measured by dynamic ultra-high-speed Scheimpflug imaging</title><author>Correia, Fernando Faria ; Ramos, Isaac ; Roberts, Cynthia J ; Steinmueller, Andreas ; Krug, Matthias ; Ambrósio, Jr, Renato</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c331t-6322b657e1eb00b239e300ccd75f202926a033d5814a139fa8055f43708a49d83</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Air Pressure</topic><topic>Analysis of Variance</topic><topic>Biomechanical Phenomena</topic><topic>Contact Lenses - standards</topic><topic>Cornea - physiology</topic><topic>Cornea - surgery</topic><topic>Corneal Pachymetry - methods</topic><topic>Image Processing, Computer-Assisted - methods</topic><topic>Manometry - methods</topic><topic>Models, Biological</topic><topic>OPHTHALMOLOGY</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Correia, Fernando Faria</creatorcontrib><creatorcontrib>Ramos, Isaac</creatorcontrib><creatorcontrib>Roberts, Cynthia J</creatorcontrib><creatorcontrib>Steinmueller, Andreas</creatorcontrib><creatorcontrib>Krug, Matthias</creatorcontrib><creatorcontrib>Ambrósio, Jr, Renato</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>SciELO</collection><jtitle>Arquivos brasileiros de oftalmologia</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Correia, Fernando Faria</au><au>Ramos, Isaac</au><au>Roberts, Cynthia J</au><au>Steinmueller, Andreas</au><au>Krug, Matthias</au><au>Ambrósio, Jr, Renato</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Impact of chamber pressure and material properties on the deformation response of corneal models measured by dynamic ultra-high-speed Scheimpflug imaging</atitle><jtitle>Arquivos brasileiros de oftalmologia</jtitle><addtitle>Arq Bras Oftalmol</addtitle><date>2013-10-01</date><risdate>2013</risdate><volume>76</volume><issue>5</issue><spage>278</spage><epage>281</epage><pages>278-281</pages><issn>0004-2749</issn><issn>1678-2925</issn><eissn>1678-2925</eissn><abstract>To study the deformation response of three distinct contact lenses with known structures, which served as corneal models, under different chamber pressures using ultra-high-speed (UHS) Scheimpflug imaging.
Three hydrophilic contact lenses were mounted on a sealed water chamber with precisely adjustable pressure: TAN-G5X (41% hydroxyethylmethacrylate/glycolmethacrylate, 550 µm thick), TAN-40 (62% hydroxyethylmethacrylate, 525 µm thick) and TAN-58 (42% methylmethacrylate, 258 µm thick). Each model was tested five times under different pressures (5, 15, 25, 35 and 45 mmHg), using ultra-high-speed Scheimpflug imaging during non-contact tonometry. 140 Scheimpflug images were taken with the UHS camera in each measurement. The deformation amplitude during non-contact tonometry was determined as the highest displacement of the apex at the highest concavity (HC) moment.
At each pressure level, the deformation amplitude was statistically different for each lens tested (p<0.001, ANOVA). Each lens had different deformation amplitudes under different pressure levels (p<0.001; Bonferroni post-hoc test). The thicker lens with less polymer (TAN-G5X) had a higher deformation (less stiff behavior) than the one that was thinner but with more polymer (TAN-40), when measured at the same internal pressure. The thinnest lens with less polymers (TAN-58) had a lower deformation amplitude (stiffer behavior) at higher pressures than the thicker ones with more polymer (TAN-40 and TAN-G5X) at lower pressures.
UHS Scheimpflug imaging allowed for biomechanical assessment through deformation characterization of corneal models. Biomechanical behavior was more influenced by material composition than by thickness. Chamber pressure had a significant impact on deformation response of each lens.</abstract><cop>Brazil</cop><pub>Conselho Brasileiro de Oftalmologia</pub><pmid>24232940</pmid><doi>10.1590/S0004-27492013000500005</doi><tpages>4</tpages><oa>free_for_read</oa></addata></record> |
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| source | MEDLINE; IngentaConnect Free/Open Access Journals; EZB-FREE-00999 freely available EZB journals |
| subjects | Air Pressure Analysis of Variance Biomechanical Phenomena Contact Lenses - standards Cornea - physiology Cornea - surgery Corneal Pachymetry - methods Image Processing, Computer-Assisted - methods Manometry - methods Models, Biological OPHTHALMOLOGY |
| title | Impact of chamber pressure and material properties on the deformation response of corneal models measured by dynamic ultra-high-speed Scheimpflug imaging |
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