Measurement of elastic resisting forces of intraocular haptic loops of varying geometrical designs and material composition.
Identifieur interne : 002230 ( PubMed/Curation ); précédent : 002229; suivant : 002231Measurement of elastic resisting forces of intraocular haptic loops of varying geometrical designs and material composition.
Auteurs : R. Guthoff [Allemagne] ; F. Abramo ; J. Draeger ; L. ChumbleySource :
- Journal of cataract and refractive surgery [ 0886-3350 ] ; 1990.
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Abstract
The relationship between experimentally induced intraocular lens (IOL) haptic deformation and resulting elastic haptic counter-resisting forces measured by electronic dynamometry was examined for 34 different IOL haptics of varying material composition and geometrical designs. Poly(methyl methacrylate) (PMMA) and polypropylene loops of similar geometry did not fundamentally differ from one another, although lenses of differing geometry behaved differently. Unlike PMMA and polypropylene loops, soft haptics of poly-HEMA and silicone rubber demonstrated a larger elastic resistance force to the same degree of deformation. This was based upon design characteristics of the lenses and not upon intrinsic properties of the materials, which would have produced the opposite result. By comparative analysis of these dynamometer measurements and considerations of the lens design and elastic properties (including memory) of the component materials, we can calculate the stresses upon the zonular and capsular bag structures during and after IOL implantation.
PubMed: 2231368
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Abramo</name></author><author><name sortKey="Draeger, J" sort="Draeger, J" uniqKey="Draeger J" first="J" last="Draeger">J. Draeger</name></author><author><name sortKey="Chumbley, L" sort="Chumbley, L" uniqKey="Chumbley L" first="L" last="Chumbley">L. 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Poly(methyl methacrylate) (PMMA) and polypropylene loops of similar geometry did not fundamentally differ from one another, although lenses of differing geometry behaved differently. Unlike PMMA and polypropylene loops, soft haptics of poly-HEMA and silicone rubber demonstrated a larger elastic resistance force to the same degree of deformation. This was based upon design characteristics of the lenses and not upon intrinsic properties of the materials, which would have produced the opposite result. By comparative analysis of these dynamometer measurements and considerations of the lens design and elastic properties (including memory) of the component materials, we can calculate the stresses upon the zonular and capsular bag structures during and after IOL implantation.</div></front></TEI><pubmed><MedlineCitation Owner="NLM" Status="MEDLINE"><PMID Version="1">2231368</PMID><DateCreated><Year>1990</Year><Month>12</Month><Day>05</Day></DateCreated><DateCompleted><Year>1990</Year><Month>12</Month><Day>05</Day></DateCompleted><DateRevised><Year>2013</Year><Month>11</Month><Day>21</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0886-3350</ISSN><JournalIssue CitedMedium="Print"><Volume>16</Volume><Issue>5</Issue><PubDate><Year>1990</Year><Month>Sep</Month></PubDate></JournalIssue><Title>Journal of cataract and refractive surgery</Title><ISOAbbreviation>J Cataract Refract Surg</ISOAbbreviation></Journal><ArticleTitle>Measurement of elastic resisting forces of intraocular haptic loops of varying geometrical designs and material composition.</ArticleTitle><Pagination><MedlinePgn>551-8</MedlinePgn></Pagination><Abstract><AbstractText>The relationship between experimentally induced intraocular lens (IOL) haptic deformation and resulting elastic haptic counter-resisting forces measured by electronic dynamometry was examined for 34 different IOL haptics of varying material composition and geometrical designs. Poly(methyl methacrylate) (PMMA) and polypropylene loops of similar geometry did not fundamentally differ from one another, although lenses of differing geometry behaved differently. Unlike PMMA and polypropylene loops, soft haptics of poly-HEMA and silicone rubber demonstrated a larger elastic resistance force to the same degree of deformation. This was based upon design characteristics of the lenses and not upon intrinsic properties of the materials, which would have produced the opposite result. 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