Compression forces of haptics of selected posterior chamber lenses
Identifieur interne : 002255 ( Istex/Corpus ); précédent : 002254; suivant : 002256Compression forces of haptics of selected posterior chamber lenses
Auteurs : Olavi P Rssinen ; Jorma R Ty ; Anneli Klemetti ; Anna-Liisa Lyyra ; Jussi TimonenSource :
- Journal of Cataract & Refractive Surgery [ 0886-3350 ] ; 1997.
Abstract
Purpose: To compare the compressive forces of the haptics of different intraocular lens (IOL) models and analyze the observed differences.Setting: Central Hospital of Central Finland and University of Jyväskylä, Jyväskylä, Finland.Methods: The haptics of 28 IOL models were compressed to a diameter of 9.0 mm. The compression forces were measured at 0.5 mm intervals. The conclusions were verified by numerical simulations of mechanical models of the lenses.Results: The measured forces varied between 100 and 601 mg at a diameter of 11.0 mm, 206 and 1057 mg at a diameter of 10.0 mm, and 315 and 2094 mg at a diameter of 9.0 mm. The slopes of the force curves of the three-piece lenses were fairly linear. In general, the three-piece models were less rigid than one-piece models and underwent plastic deformations after repeated compressions. For most one-piece models, compression force increased progressively with increasing compression. The overall IOL diameter and differences in haptic thickness and length and the angle between optic at the point of haptic insertion were the main causes of the observed differences in the compression forces. The variation in forces between individual specimens of the same model, which occurred with almost all models, were mainly the result of variations in haptic thickness.Conclusion: Great variations in the compression forces of the IOL haptics were found. Compression behaviors should be taken into account when selecting a lens to implant.
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DOI: 10.1016/S0886-3350(97)80322-7
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Compression forces of haptics of selected posterior chamber lenses</title><author><name sortKey="P Rssinen, Olavi" sort="P Rssinen, Olavi" uniqKey="P Rssinen O" first="Olavi" last="P Rssinen">Olavi P Rssinen</name><affiliation><mods:affiliation>From the Department of Ophthalmology, Central Hospital of Central Finland</mods:affiliation></affiliation><affiliation><mods:affiliation>Reprint requests to Olavi Pärssinen, MD, PhD, Kannaksenkatu 5 40600 Jyväskylä, Finland.</mods:affiliation></affiliation></author><author><name sortKey="R Ty, Jorma" sort="R Ty, Jorma" uniqKey="R Ty J" first="Jorma" last="R Ty">Jorma R Ty</name><affiliation><mods:affiliation>Department of Physics, University of Jyväskylä, Jyväskylä, Finland.</mods:affiliation></affiliation></author><author><name sortKey="Klemetti, Anneli" sort="Klemetti, Anneli" uniqKey="Klemetti A" first="Anneli" last="Klemetti">Anneli Klemetti</name><affiliation><mods:affiliation>From the Department of Ophthalmology, Central Hospital of Central Finland</mods:affiliation></affiliation></author><author><name sortKey="Lyyra, Anna Liisa" sort="Lyyra, Anna Liisa" uniqKey="Lyyra A" first="Anna-Liisa" last="Lyyra">Anna-Liisa Lyyra</name><affiliation><mods:affiliation>Department of Statistics, University of Jyväskylä, Jyväskylä, Finland.</mods:affiliation></affiliation></author><author><name sortKey="Timonen, Jussi" sort="Timonen, Jussi" uniqKey="Timonen J" first="Jussi" last="Timonen">Jussi Timonen</name><affiliation><mods:affiliation>Department of Physics, University of Jyväskylä, Jyväskylä, Finland.</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:713AA36BA203595E1C89770165267A1F4630713E</idno><date when="1997" year="1997">1997</date><idno type="doi">10.1016/S0886-3350(97)80322-7</idno><idno 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Finland.</mods:affiliation></affiliation></author><author><name sortKey="Klemetti, Anneli" sort="Klemetti, Anneli" uniqKey="Klemetti A" first="Anneli" last="Klemetti">Anneli Klemetti</name><affiliation><mods:affiliation>From the Department of Ophthalmology, Central Hospital of Central Finland</mods:affiliation></affiliation></author><author><name sortKey="Lyyra, Anna Liisa" sort="Lyyra, Anna Liisa" uniqKey="Lyyra A" first="Anna-Liisa" last="Lyyra">Anna-Liisa Lyyra</name><affiliation><mods:affiliation>Department of Statistics, University of Jyväskylä, Jyväskylä, Finland.</mods:affiliation></affiliation></author><author><name sortKey="Timonen, Jussi" sort="Timonen, Jussi" uniqKey="Timonen J" first="Jussi" last="Timonen">Jussi Timonen</name><affiliation><mods:affiliation>Department of Physics, University of Jyväskylä, Jyväskylä, Finland.</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Cataract & Refractive Surgery</title><title level="j" type="abbrev">JCRS</title><idno type="ISSN">0886-3350</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1997">1997</date><biblScope unit="volume">23</biblScope><biblScope unit="issue">8</biblScope><biblScope unit="page" from="1237">1237</biblScope><biblScope unit="page" to="1246">1246</biblScope></imprint><idno type="ISSN">0886-3350</idno></series><idno type="istex">713AA36BA203595E1C89770165267A1F4630713E</idno><idno type="DOI">10.1016/S0886-3350(97)80322-7</idno><idno type="PII">S0886-3350(97)80322-7</idno><idno type="ArticleID">80322</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0886-3350</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Purpose: To compare the compressive forces of the haptics of different intraocular lens (IOL) models and analyze the observed differences.Setting: Central Hospital of Central Finland and University of Jyväskylä, Jyväskylä, Finland.Methods: The haptics of 28 IOL models were compressed to a diameter of 9.0 mm. The compression forces were measured at 0.5 mm intervals. The conclusions were verified by numerical simulations of mechanical models of the lenses.Results: The measured forces varied between 100 and 601 mg at a diameter of 11.0 mm, 206 and 1057 mg at a diameter of 10.0 mm, and 315 and 2094 mg at a diameter of 9.0 mm. The slopes of the force curves of the three-piece lenses were fairly linear. In general, the three-piece models were less rigid than one-piece models and underwent plastic deformations after repeated compressions. For most one-piece models, compression force increased progressively with increasing compression. The overall IOL diameter and differences in haptic thickness and length and the angle between optic at the point of haptic insertion were the main causes of the observed differences in the compression forces. The variation in forces between individual specimens of the same model, which occurred with almost all models, were mainly the result of variations in haptic thickness.Conclusion: Great variations in the compression forces of the IOL haptics were found. Compression behaviors should be taken into account when selecting a lens to implant.</div></front></TEI><istex><corpusName>elsevier</corpusName><author><json:item><name>Olavi Pärssinen MD, PhD</name><affiliations><json:string>From the Department of Ophthalmology, Central Hospital of Central Finland</json:string><json:string>Reprint requests to Olavi Pärssinen, MD, PhD, Kannaksenkatu 5 40600 Jyväskylä, Finland.</json:string></affiliations></json:item><json:item><name>Jorma Räty MSc</name><affiliations><json:string>Department of Physics, University of Jyväskylä, Jyväskylä, Finland.</json:string></affiliations></json:item><json:item><name>Anneli Klemetti MD, PhD</name><affiliations><json:string>From the Department of Ophthalmology, Central Hospital of Central Finland</json:string></affiliations></json:item><json:item><name>Anna-Liisa Lyyra MSc</name><affiliations><json:string>Department of Statistics, University of Jyväskylä, Jyväskylä, Finland.</json:string></affiliations></json:item><json:item><name>Jussi Timonen PhD</name><affiliations><json:string>Department of Physics, University of Jyväskylä, Jyväskylä, Finland.</json:string></affiliations></json:item></author><articleId><json:string>80322</json:string></articleId><language><json:string>eng</json:string></language><abstract>Purpose: To compare the compressive forces of the haptics of different intraocular lens (IOL) models and analyze the observed differences.Setting: Central Hospital of Central Finland and University of Jyväskylä, Jyväskylä, Finland.Methods: The haptics of 28 IOL models were compressed to a diameter of 9.0 mm. The compression forces were measured at 0.5 mm intervals. The conclusions were verified by numerical simulations of mechanical models of the lenses.Results: The measured forces varied between 100 and 601 mg at a diameter of 11.0 mm, 206 and 1057 mg at a diameter of 10.0 mm, and 315 and 2094 mg at a diameter of 9.0 mm. The slopes of the force curves of the three-piece lenses were fairly linear. In general, the three-piece models were less rigid than one-piece models and underwent plastic deformations after repeated compressions. For most one-piece models, compression force increased progressively with increasing compression. The overall IOL diameter and differences in haptic thickness and length and the angle between optic at the point of haptic insertion were the main causes of the observed differences in the compression forces. The variation in forces between individual specimens of the same model, which occurred with almost all models, were mainly the result of variations in haptic thickness.Conclusion: Great variations in the compression forces of the IOL haptics were found. Compression behaviors should be taken into account when selecting a lens to implant.</abstract><qualityIndicators><score>8.494</score><pdfVersion>1.7</pdfVersion><pdfPageSize>576 x 828 pts</pdfPageSize><refBibsNative>true</refBibsNative><keywordCount>0</keywordCount><abstractCharCount>1489</abstractCharCount><pdfWordCount>3734</pdfWordCount><pdfCharCount>24445</pdfCharCount><pdfPageCount>10</pdfPageCount><abstractWordCount>230</abstractWordCount></qualityIndicators><title>Compression forces of haptics of selected posterior chamber lenses</title><pii><json:string>S0886-3350(97)80322-7</json:string></pii><genre><json:string>research-article</json:string></genre><host><volume>23</volume><pii><json:string>S0886-3350(97)X8298-7</json:string></pii><pages><last>1246</last><first>1237</first></pages><issn><json:string>0886-3350</json:string></issn><issue>8</issue><genre><json:string>Journal</json:string></genre><language><json:string>unknown</json:string></language><title>Journal of Cataract & Refractive Surgery</title><publicationDate>1997</publicationDate></host><categories><wos><json:string>OPHTHALMOLOGY</json:string><json:string>SURGERY</json:string></wos></categories><publicationDate>1997</publicationDate><copyrightDate>1997</copyrightDate><doi><json:string>10.1016/S0886-3350(97)80322-7</json:string></doi><id>713AA36BA203595E1C89770165267A1F4630713E</id><score>1</score><fulltext><json:item><original>true</original><mimetype>application/pdf</mimetype><extension>pdf</extension><uri>https://api.istex.fr/document/713AA36BA203595E1C89770165267A1F4630713E/fulltext/pdf</uri></json:item><json:item><original>true</original><mimetype>text/plain</mimetype><extension>txt</extension><uri>https://api.istex.fr/document/713AA36BA203595E1C89770165267A1F4630713E/fulltext/txt</uri></json:item><json:item><original>false</original><mimetype>application/zip</mimetype><extension>zip</extension><uri>https://api.istex.fr/document/713AA36BA203595E1C89770165267A1F4630713E/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/713AA36BA203595E1C89770165267A1F4630713E/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">Compression forces of haptics of selected posterior chamber lenses</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>ELSEVIER</publisher><availability><p>ELSEVIER</p></availability><date>1997</date></publicationStmt><notesStmt><note>Supported in part by the Central Hospital of Central Finland. Alcon, Allergan, Coburn, Domilens, Pharmacia, and Rayner provided the intraocular lenses, and Allergan, Pharmacia, and Rayner provided financial support.</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Compression forces of haptics of selected posterior chamber lenses</title><author><persName><forename type="first">Olavi</forename><surname>Pärssinen</surname></persName><roleName type="degree">MD, PhD</roleName><affiliation>From the Department of Ophthalmology, Central Hospital of Central Finland</affiliation><affiliation>Reprint requests to Olavi Pärssinen, MD, PhD, Kannaksenkatu 5 40600 Jyväskylä, Finland.</affiliation></author><author><persName><forename type="first">Jorma</forename><surname>Räty</surname></persName><roleName type="degree">MSc</roleName><affiliation>Department of Physics, University of Jyväskylä, Jyväskylä, Finland.</affiliation></author><author><persName><forename type="first">Anneli</forename><surname>Klemetti</surname></persName><roleName type="degree">MD, PhD</roleName><affiliation>From the Department of Ophthalmology, Central Hospital of Central Finland</affiliation></author><author><persName><forename type="first">Anna-Liisa</forename><surname>Lyyra</surname></persName><roleName type="degree">MSc</roleName><affiliation>Department of Statistics, University of Jyväskylä, Jyväskylä, Finland.</affiliation></author><author><persName><forename type="first">Jussi</forename><surname>Timonen</surname></persName><roleName type="degree">PhD</roleName><affiliation>Department of Physics, University of Jyväskylä, Jyväskylä, Finland.</affiliation></author></analytic><monogr><title level="j">Journal of Cataract & Refractive Surgery</title><title level="j" type="abbrev">JCRS</title><idno type="pISSN">0886-3350</idno><idno type="PII">S0886-3350(97)X8298-7</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1997"></date><biblScope unit="volume">23</biblScope><biblScope unit="issue">8</biblScope><biblScope unit="page" from="1237">1237</biblScope><biblScope unit="page" to="1246">1246</biblScope></imprint></monogr><idno type="istex">713AA36BA203595E1C89770165267A1F4630713E</idno><idno type="DOI">10.1016/S0886-3350(97)80322-7</idno><idno type="PII">S0886-3350(97)80322-7</idno><idno type="ArticleID">80322</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1997</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Purpose: To compare the compressive forces of the haptics of different intraocular lens (IOL) models and analyze the observed differences.Setting: Central Hospital of Central Finland and University of Jyväskylä, Jyväskylä, Finland.Methods: The haptics of 28 IOL models were compressed to a diameter of 9.0 mm. The compression forces were measured at 0.5 mm intervals. The conclusions were verified by numerical simulations of mechanical models of the lenses.Results: The measured forces varied between 100 and 601 mg at a diameter of 11.0 mm, 206 and 1057 mg at a diameter of 10.0 mm, and 315 and 2094 mg at a diameter of 9.0 mm. The slopes of the force curves of the three-piece lenses were fairly linear. In general, the three-piece models were less rigid than one-piece models and underwent plastic deformations after repeated compressions. For most one-piece models, compression force increased progressively with increasing compression. The overall IOL diameter and differences in haptic thickness and length and the angle between optic at the point of haptic insertion were the main causes of the observed differences in the compression forces. The variation in forces between individual specimens of the same model, which occurred with almost all models, were mainly the result of variations in haptic thickness.Conclusion: Great variations in the compression forces of the IOL haptics were found. Compression behaviors should be taken into account when selecting a lens to implant.</p></abstract></profileDesc><revisionDesc><change when="1997">Published</change></revisionDesc></teiHeader></istex:fulltextTEI></fulltext><metadata><istex:metadataXml wicri:clean="Elsevier doc found" wicri:toSee="Elsevier, no converted or simple article"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" </istex:xmlDeclaration><istex:docType PUBLIC="-//ES//DTD journal article DTD version 5.2.0//EN//XML" URI="art520.dtd" name="istex:docType"></istex:docType><istex:document><article version="5.2" xml:lang="en" docsubtype="fla"><item-info><jid>JCRS</jid><aid>80322</aid><ce:pii>S0886-3350(97)80322-7</ce:pii><ce:doi>10.1016/S0886-3350(97)80322-7</ce:doi><ce:copyright type="society" year="1997">American Society of Cataract and Refractive Surgery and European Society of Cataract and Refractive Surgeons. All rights reserved</ce:copyright><ce:copyright-line>Copyright 1997 American Society of Cataract and Refractive Surgery and European Society of Cataract and Refractive Surgeons. All rights reserved</ce:copyright-line></item-info><head><ce:article-footnote><ce:note-para id="ntp005">Supported in part by the Central Hospital of Central Finland. Alcon, Allergan, Coburn, Domilens, Pharmacia, and Rayner provided the intraocular lenses, and Allergan, Pharmacia, and Rayner provided financial support.</ce:note-para></ce:article-footnote><ce:title id="ttl005">Compression forces of haptics of selected posterior chamber lenses</ce:title><ce:author-group id="AUG005"><ce:author id="AUT005"><ce:given-name>Olavi</ce:given-name><ce:surname>Pärssinen</ce:surname><ce:degrees>MD, PhD</ce:degrees><ce:cross-ref id="crr005" refid="aff1"><ce:sup>a</ce:sup></ce:cross-ref><ce:cross-ref id="crr010" refid="cor1"><ce:sup>1</ce:sup></ce:cross-ref></ce:author><ce:author id="AUT010"><ce:given-name>Jorma</ce:given-name><ce:surname>Räty</ce:surname><ce:degrees>MSc</ce:degrees><ce:cross-ref id="crr015" refid="aff2"><ce:sup>b</ce:sup></ce:cross-ref></ce:author><ce:author id="AUT015"><ce:given-name>Anneli</ce:given-name><ce:surname>Klemetti</ce:surname><ce:degrees>MD, PhD</ce:degrees><ce:cross-ref id="crr020" refid="aff1"><ce:sup>a</ce:sup></ce:cross-ref></ce:author><ce:author id="AUT020"><ce:given-name>Anna-Liisa</ce:given-name><ce:surname>Lyyra</ce:surname><ce:degrees>MSc</ce:degrees><ce:cross-ref id="crr025" refid="aff3"><ce:sup>c</ce:sup></ce:cross-ref></ce:author><ce:author id="AUT025"><ce:given-name>Jussi</ce:given-name><ce:surname>Timonen</ce:surname><ce:degrees>PhD</ce:degrees><ce:cross-ref id="crr030" refid="aff2"><ce:sup>b</ce:sup></ce:cross-ref></ce:author><ce:affiliation id="aff1"><ce:label>a</ce:label><ce:textfn>From the Department of Ophthalmology, Central Hospital of Central Finland</ce:textfn><sa:affiliation><sa:organization>Department of Ophthalmology</sa:organization><sa:organization>Central Hospital of Central</sa:organization><sa:country>Finland</sa:country></sa:affiliation></ce:affiliation><ce:affiliation id="aff2"><ce:label>b</ce:label><ce:textfn>Department of Physics, University of Jyväskylä, Jyväskylä, Finland.</ce:textfn><sa:affiliation><sa:organization>Department of Physics</sa:organization><sa:organization>University of Jyväskylä</sa:organization><sa:city>Jyväskylä</sa:city><sa:country>Finland</sa:country></sa:affiliation></ce:affiliation><ce:affiliation id="aff3"><ce:label>c</ce:label><ce:textfn>Department of Statistics, University of Jyväskylä, Jyväskylä, Finland.</ce:textfn><sa:affiliation><sa:organization>Department of Statistics</sa:organization><sa:organization>University of Jyväskylä</sa:organization><sa:city>Jyväskylä</sa:city><sa:country>Finland</sa:country></sa:affiliation></ce:affiliation><ce:correspondence id="cor1"><ce:label>1</ce:label><ce:text>Reprint requests to Olavi Pärssinen, MD, PhD, Kannaksenkatu 5 40600 Jyväskylä, Finland.</ce:text></ce:correspondence></ce:author-group><ce:abstract id="ab1"><ce:section-title id="SET005">Abstract</ce:section-title><ce:abstract-sec id="abs005"><ce:simple-para id="SP0005"><ce:bold><ce:italic>Purpose:</ce:italic></ce:bold> To compare the compressive forces of the haptics of different intraocular lens (IOL) models and analyze the observed differences.</ce:simple-para><ce:simple-para id="SP0010"><ce:bold><ce:italic>Setting:</ce:italic></ce:bold> Central Hospital of Central Finland and University of Jyväskylä, Jyväskylä, Finland.</ce:simple-para><ce:simple-para id="SP0015"><ce:bold><ce:italic>Methods:</ce:italic></ce:bold> The haptics of 28 IOL models were compressed to a diameter of 9.0 mm. The compression forces were measured at 0.5 mm intervals. The conclusions were verified by numerical simulations of mechanical models of the lenses.</ce:simple-para><ce:simple-para id="SP0020"><ce:bold><ce:italic>Results:</ce:italic></ce:bold> The measured forces varied between 100 and 601 mg at a diameter of 11.0 mm, 206 and 1057 mg at a diameter of 10.0 mm, and 315 and 2094 mg at a diameter of 9.0 mm. The slopes of the force curves of the three-piece lenses were fairly linear. In general, the three-piece models were less rigid than one-piece models and underwent plastic deformations after repeated compressions. For most one-piece models, compression force increased progressively with increasing compression. The overall IOL diameter and differences in haptic thickness and length and the angle between optic at the point of haptic insertion were the main causes of the observed differences in the compression forces. The variation in forces between individual specimens of the same model, which occurred with almost all models, were mainly the result of variations in haptic thickness.</ce:simple-para><ce:simple-para id="SP0025"><ce:bold><ce:italic>Conclusion:</ce:italic></ce:bold> Great variations in the compression forces of the IOL haptics were found. Compression behaviors should be taken into account when selecting a lens to implant.</ce:simple-para></ce:abstract-sec></ce:abstract></head><tail><ce:bibliography id="R0005"><ce:section-title id="SET010">References</ce:section-title><ce:bibliography-sec id="RS0005"><ce:bib-reference id="bib1"><ce:label>1.</ce:label><sb:reference id="SB0005"><sb:contribution><sb:authors><sb:author><ce:given-name>R</ce:given-name><ce:surname>Guthoff</ce:surname></sb:author><sb:author><ce:given-name>F</ce:given-name><ce:surname>Abramo</ce:surname></sb:author><sb:author><ce:given-name>J</ce:given-name><ce:surname>Draeger</ce:surname></sb:author><sb:author><ce:given-name>L</ce:given-name><ce:surname>Chumbley</ce:surname></sb:author></sb:authors><sb:title><sb:maintitle>Measurement of elastic resisting forces of intraocular haptic loops of varying geometrical designs and material composition</sb:maintitle></sb:title></sb:contribution><sb:host><sb:issue><sb:series><sb:title><sb:maintitle>J Cataract Refract Surg</sb:maintitle></sb:title><sb:volume-nr>16</sb:volume-nr></sb:series><sb:date>1990</sb:date></sb:issue><sb:pages><sb:first-page>551</sb:first-page><sb:last-page>558</sb:last-page></sb:pages></sb:host></sb:reference></ce:bib-reference><ce:bib-reference id="bib2"><ce:label>2.</ce:label><sb:reference id="SB0010"><sb:contribution><sb:authors><sb:author><ce:given-name>EI</ce:given-name><ce:surname>Assia</ce:surname></sb:author><sb:author><ce:given-name>DJ</ce:given-name><ce:surname>Apple</ce:surname></sb:author><sb:author><ce:given-name>JC</ce:given-name><ce:surname>Tsai</ce:surname></sb:author><sb:author><ce:given-name>ES</ce:given-name><ce:surname>Lim</ce:surname></sb:author></sb:authors><sb:title><sb:maintitle>The elastic properties of the lens capsule in capsulorhexis</sb:maintitle></sb:title></sb:contribution><sb:host><sb:issue><sb:series><sb:title><sb:maintitle>Am J Ophthalmol</sb:maintitle></sb:title><sb:volume-nr>111</sb:volume-nr></sb:series><sb:date>1991</sb:date></sb:issue><sb:pages><sb:first-page>628</sb:first-page><sb:last-page>632</sb:last-page></sb:pages></sb:host></sb:reference></ce:bib-reference></ce:bibliography-sec></ce:bibliography></tail></article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Compression forces of haptics of selected posterior chamber lenses</title></titleInfo><titleInfo type="alternative" lang="en" contentType="CDATA"><title>Compression forces of haptics of selected posterior chamber lenses</title></titleInfo><name type="personal"><namePart type="given">Olavi</namePart><namePart type="family">Pärssinen</namePart><namePart type="termsOfAddress">MD, PhD</namePart><affiliation>From the Department of Ophthalmology, Central Hospital of Central Finland</affiliation><affiliation>Reprint requests to Olavi Pärssinen, MD, PhD, Kannaksenkatu 5 40600 Jyväskylä, Finland.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Jorma</namePart><namePart type="family">Räty</namePart><namePart type="termsOfAddress">MSc</namePart><affiliation>Department of Physics, University of Jyväskylä, Jyväskylä, Finland.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Anneli</namePart><namePart type="family">Klemetti</namePart><namePart type="termsOfAddress">MD, PhD</namePart><affiliation>From the Department of Ophthalmology, Central Hospital of Central Finland</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Anna-Liisa</namePart><namePart type="family">Lyyra</namePart><namePart type="termsOfAddress">MSc</namePart><affiliation>Department of Statistics, University of Jyväskylä, Jyväskylä, Finland.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Jussi</namePart><namePart type="family">Timonen</namePart><namePart type="termsOfAddress">PhD</namePart><affiliation>Department of Physics, University of Jyväskylä, Jyväskylä, Finland.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="Full-length article"></genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1997</dateIssued><copyrightDate encoding="w3cdtf">1997</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Purpose: To compare the compressive forces of the haptics of different intraocular lens (IOL) models and analyze the observed differences.Setting: Central Hospital of Central Finland and University of Jyväskylä, Jyväskylä, Finland.Methods: The haptics of 28 IOL models were compressed to a diameter of 9.0 mm. The compression forces were measured at 0.5 mm intervals. The conclusions were verified by numerical simulations of mechanical models of the lenses.Results: The measured forces varied between 100 and 601 mg at a diameter of 11.0 mm, 206 and 1057 mg at a diameter of 10.0 mm, and 315 and 2094 mg at a diameter of 9.0 mm. The slopes of the force curves of the three-piece lenses were fairly linear. In general, the three-piece models were less rigid than one-piece models and underwent plastic deformations after repeated compressions. For most one-piece models, compression force increased progressively with increasing compression. The overall IOL diameter and differences in haptic thickness and length and the angle between optic at the point of haptic insertion were the main causes of the observed differences in the compression forces. The variation in forces between individual specimens of the same model, which occurred with almost all models, were mainly the result of variations in haptic thickness.Conclusion: Great variations in the compression forces of the IOL haptics were found. Compression behaviors should be taken into account when selecting a lens to implant.</abstract><note>Supported in part by the Central Hospital of Central Finland. Alcon, Allergan, Coburn, Domilens, Pharmacia, and Rayner provided the intraocular lenses, and Allergan, Pharmacia, and Rayner provided financial support.</note><relatedItem type="host"><titleInfo><title>Journal of Cataract & Refractive Surgery</title></titleInfo><titleInfo type="abbreviated"><title>JCRS</title></titleInfo><genre type="Journal">journal</genre><originInfo><dateIssued encoding="w3cdtf">199710</dateIssued></originInfo><identifier type="ISSN">0886-3350</identifier><identifier type="PII">S0886-3350(97)X8298-7</identifier><part><detail type="volume"><number>23</number><caption>vol.</caption></detail><detail type="issue"><number>8</number><caption>no.</caption></detail><extent unit="issue pages"><start>1127</start><end>1274</end></extent><extent unit="pages"><start>1237</start><end>1246</end></extent></part></relatedItem><identifier type="istex">713AA36BA203595E1C89770165267A1F4630713E</identifier><identifier type="DOI">10.1016/S0886-3350(97)80322-7</identifier><identifier type="PII">S0886-3350(97)80322-7</identifier><identifier type="ArticleID">80322</identifier><accessCondition type="use and reproduction" contentType="">© 1997American Society of Cataract and Refractive Surgery and European Society of Cataract and Refractive Surgeons. All rights reserved</accessCondition><recordInfo><recordContentSource>ELSEVIER</recordContentSource><recordOrigin>American Society of Cataract and Refractive Surgery and European Society of Cataract and Refractive Surgeons. All rights reserved, ©1997</recordOrigin></recordInfo></mods></metadata><enrichments><istex:catWosTEI uri="https://api.istex.fr/document/713AA36BA203595E1C89770165267A1F4630713E/enrichments/catWos"><teiHeader><profileDesc><textClass><classCode scheme="WOS">OPHTHALMOLOGY</classCode><classCode scheme="WOS">SURGERY</classCode></textClass></profileDesc></teiHeader></istex:catWosTEI></enrichments><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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