mycoreobjectrosdok_document_0000000007rosdok_document_0000000007rosdokdocumentrosdok_derivate_00000019022023-08-08T10:50:54.597Z2006-11-22T10:35:49.061Zadministratorpublished1rosdok_derivate_0000001902truetruederivate_types:fulltextVolltextfulltextwf_edit_epub wf_register_epubstate:publishedstate:publishedveröffentlichtpublishedrosdok/id00002123657052213Oau2011-05-032023-08-05T14:18:50ZrdaConverted from PICA to MODS using Pica2Mods XSLT Transformer 2.7 [SCM: "0c0e7a3c226a4a0cbcbec39b493c3c5257339ab8" "v2.7" "2023-08-04T00:00:00+0200"] with mode 'DEFAULT'.ArtikelComparison of the accommodation theories of Coleman and of Helmholtz by finite element simulationsPurpose: The accommodation process of the human eye is still a controversial subject. Coleman assumes that the lens, together with the zonula fibers, forms a diaphragm which is held in a catenary shape due to the pressure difference between the aqueous and vitreous body of the lens. The aim of the paper is to compare the results of two simulations (according to the Helmholtz and to the Coleman theories) with ultrasonographic data. Methods: An axisymmetric static finite element model of the lens was generated using the literature data for geometry, material properties and loads. The refractive power of the lens was calculated for two different ages (29 and 45 years). Results: The application of a pressure to the posterior lens surface did not yield an increase in refractive power change during accommodation. Rather a decrease in accommodation related refractive power was found. Conclusions: Physiologically relevant refractive power changes are obtained by a simulation in accordance with the Helmholtz theory. A simulation in accordance with the Coleman theory does not yield physiological values of refractive power change.HeinerMartin1958 -VerfasserInaut13386068XRudolfGuthoff1948 -VerfasserInaut108716899ThomTerweeVerfasserInautKlaus-PeterSchmitz1946 -VerfasserInaut132780844http://purl.uni-rostock.de/rosdok/id00002123urn:nbn:de:gbv:28-rosdok_id00002123-110.18453/rosdok_id00002123610 Medizin, GesundheitUniversitätsmedizinalle Rechte vorbehaltenNutzungsrechte erteiltLizenz Metadaten: CC0frei zugänglich (Open Access)enOnline-Ressource (6 Seiten)2005Elsevier ScienceExeter[Preprint]monographic20052006Universitätsbibliothek RostockRostock2006Universitätsbibliothek Rostockhttp://purl.uni-rostock.de/rosdok/id00002123Heiner Martin; Rudolf Guthoff; Thom Terwee; Klaus-Peter SchmitzVision research20052005Volume 45 (2005), Issue 22, Pages 2910-29150042-6989Sonderdruck aus10.1016/j.visres.2005.05.030Erscheint auch alsVerlags-Ausgabedoctype:epubdoctype:epubDokumenttypDocument typedoctype:epub.articledoctype:epub.articleArtikelarticlediniPublType:article diniPublType2022:Articleinfo:eu-repo/semantics/articledocumentdiniPublType2022:ArticlediniPublType2022:ArticleWissenschaftlicher ArtikelScientific articleKDSF (Pu11)SDNB:610SDNB:610610 Medizin, Gesundheit610 Medical sciences Medicineinstitution:unirostockinstitution:unirostockUniversität RostockUniversity of RostockUniversität RostockUniversität RostockUni.Rostockhttp://d-nb.info/gnd/38329-6institution:unirostock.umrinstitution:unirostock.umrUniversitätsmedizinUniversity MedicineUniversität Rostock. UniversitätsmedizinUniversitätsmedizinUni.Rostock.Fakultaet.MEDhttp://d-nb.info/gnd/1029510660licenseinfo:worklicenseinfo:workWerkworklicenseinfo:work.rightsreservedlicenseinfo:work.rightsreservedalle Rechte vorbehaltenall rights reserved/creativecommons/r/reserved/0.9/88x31.png[DE-28]Urheberrechtsschutz 1.0$gRights Statements$uhttp://rightsstatements.org/vocab/InC/1.0/http://rightsstatements.org/vocab/InC/1.0/http://rightsstatements.org/vocab/InC/1.0/licenseinfo:depositlicenseinfo:depositVeröffentlichungsgenehmigungpermission to storelicenseinfo:deposit.rightsgrantedlicenseinfo:deposit.rightsgrantedNutzungsrechte erteiltrights grantedlicenseinfo:metadatalicenseinfo:metadataLizenzen für Metadatenlicenseinfo:metadata.cc0licenseinfo:metadata.cc0Lizenz Metadaten: CC0license metadata: CC0/creativecommons/p/zero/1.0/88x31.pnghttps://creativecommons.org/publicdomain/zero/1.0/accesscondition:openaccessaccesscondition:openaccessfrei zugänglich (Open Access)open accesshttp://purl.org/coar/access_right/c_abf2OAfreeinfo:eu-repo/semantics/openAccess[DE-28]Open Access$gControlled Vocabulary for Access Rights$uhttp://purl.org/coar/access_right/c_abf2rfc5646:enrfc5646:enEnglischEnglishengengComparison of the accommodation theories of Coleman and of Helmholtz by finite element simulationsComparison of the accommodation theories of Coleman and of Helmholtz by finite element simulationsgnd:13386068Xgnd:108716899gnd:132780844gnd:13386068Xgnd:108716899gnd:132780844rosdok_document_0000000007-d5617598e49gnd:13386068XHeiner MartinHeiner Martinrosdok_document_0000000007-d5617598e63gnd:108716899Rudolf GuthoffRudolf Guthoffrosdok_document_0000000007-d5617598e77Thom TerweeThom Terweerosdok_document_0000000007-d5617598e87gnd:132780844Klaus-Peter SchmitzKlaus-Peter SchmitzHeiner MartinRudolf GuthoffThom TerweeKlaus-Peter SchmitzHeiner MartinRudolf GuthoffThom TerweeKlaus-Peter SchmitzHeiner MartinRudolf GuthoffThom TerweeKlaus-Peter SchmitzExeterElsevier Scienceepub.articlehttp://purl.uni-rostock.de/rosdok/id00002123urn:nbn:de:gbv:28-rosdok_id00002123-110.18453/rosdok_id00002123Purpose: The accommodation process of the human eye is still a controversial subject. Coleman assumes that the lens, together with the zonula fibers, forms a diaphragm which is held in a catenary shape due to the pressure difference between the aqueous and vitreous body of the lens. The aim of the paper is to compare the results of two simulations (according to the Helmholtz and to the Coleman theories) with ultrasonographic data. Methods: An axisymmetric static finite element model of the lens was generated using the literature data for geometry, material properties and loads. The refractive power of the lens was calculated for two different ages (29 and 45 years). Results: The application of a pressure to the posterior lens surface did not yield an increase in refractive power change during accommodation. Rather a decrease in accommodation related refractive power was found. Conclusions: Physiologically relevant refractive power changes are obtained by a simulation in accordance with the Helmholtz theory. A simulation in accordance with the Coleman theory does not yield physiological values of refractive power change.20052005[Preprint]Vision research20052005Vision research20052005Volume 45 (2005), Issue 22, Pages 2910-29150042-6989Sonderdruck aus0042-698910.1016/j.visres.2005.05.030Erscheint auch alsVerlags-Ausgabe10.1016/j.visres.2005.05.030Heiner Martin; Rudolf Guthoff; Thom Terwee; Klaus-Peter Schmitzepub.article1 article.pdf 574157 778e3dcc678393dd86ee9fd3a0423cdd rosdok/id00002123657052213Oau2011-05-032023-08-05T14:18:50ZrdaConverted from PICA to MODS using Pica2Mods XSLT Transformer 2.7 [SCM: "0c0e7a3c226a4a0cbcbec39b493c3c5257339ab8" "v2.7" "2023-08-04T00:00:00+0200"] with mode 'DEFAULT'.ArtikelComparison of the accommodation theories of Coleman and of Helmholtz by finite element simulationsPurpose: The accommodation process of the human eye is still a controversial subject. Coleman assumes that the lens, together with the zonula fibers, forms a diaphragm which is held in a catenary shape due to the pressure difference between the aqueous and vitreous body of the lens. The aim of the paper is to compare the results of two simulations (according to the Helmholtz and to the Coleman theories) with ultrasonographic data. Methods: An axisymmetric static finite element model of the lens was generated using the literature data for geometry, material properties and loads. The refractive power of the lens was calculated for two different ages (29 and 45 years). Results: The application of a pressure to the posterior lens surface did not yield an increase in refractive power change during accommodation. Rather a decrease in accommodation related refractive power was found. Conclusions: Physiologically relevant refractive power changes are obtained by a simulation in accordance with the Helmholtz theory. A simulation in accordance with the Coleman theory does not yield physiological values of refractive power change.HeinerMartin1958 -VerfasserInaut13386068XRudolfGuthoff1948 -VerfasserInaut108716899ThomTerweeVerfasserInautKlaus-PeterSchmitz1946 -VerfasserInaut132780844http://purl.uni-rostock.de/rosdok/id00002123urn:nbn:de:gbv:28-rosdok_id00002123-110.18453/rosdok_id00002123610 Medizin, GesundheitUniversitätsmedizinalle Rechte vorbehaltenNutzungsrechte erteiltLizenz Metadaten: CC0frei zugänglich (Open Access)enOnline-Ressource (6 Seiten)2005Elsevier ScienceExeter[Preprint]monographic20052006Universitätsbibliothek RostockRostock2006Universitätsbibliothek Rostockhttp://purl.uni-rostock.de/rosdok/id00002123Heiner Martin; Rudolf Guthoff; Thom Terwee; Klaus-Peter SchmitzVision research20052005Volume 45 (2005), Issue 22, Pages 2910-29150042-6989Sonderdruck aus10.1016/j.visres.2005.05.030Erscheint auch alsVerlags-Ausgabe 2006-11-22T10:35:49.061Z 2023-08-08T10:50:54.597Z 2023-08-18T10:50:54.617Z {"identifier":"rosdok/id00002123","type":"local_id","additional":"","service":"MCRLocalID","created":"2018-06-30T16:38:00.232Z"} {"identifier":"http://purl.uni-rostock.de/rosdok/id00002123","type":"purl","additional":"","service":"RosDokPURL","created":"2018-06-30T16:38:00.842Z","registered":"2018-06-30T16:38:00.842Z"} {"identifier":"10.18453/rosdok_id00002123","type":"doi","additional":"","service":"RosDokDOI","created":"2018-06-30T16:38:02.222Z","registered":"2018-06-30T16:38:02.222Z"} {"identifier":"urn:nbn:de:gbv:28-rosdok_id00002123-1","type":"dnbUrn","additional":"","service":"RosDokURN","created":"2018-06-30T16:38:00.260Z","registered":"2018-08-15T12:50:40.463Z"} administratorfulltextfile/rosdok_document_0000000007/rosdok_derivate_0000001902/article.pdfComparison of the accommodation theories of Coleman and of Helmholtz by finite element simulationsComparison of the accommodation theories of Coleman and of Helmholtz by finite element simulationsgnd:13386068Xgnd:108716899gnd:132780844gnd:13386068Xgnd:108716899gnd:132780844rosdok_document_0000000007-d5617598e49gnd:13386068XHeiner MartinHeiner Martinrosdok_document_0000000007-d5617598e63gnd:108716899Rudolf GuthoffRudolf Guthoffrosdok_document_0000000007-d5617598e77Thom TerweeThom Terweerosdok_document_0000000007-d5617598e87gnd:132780844Klaus-Peter SchmitzKlaus-Peter SchmitzHeiner MartinRudolf GuthoffThom TerweeKlaus-Peter SchmitzHeiner MartinRudolf GuthoffThom TerweeKlaus-Peter SchmitzHeiner MartinRudolf GuthoffThom TerweeKlaus-Peter SchmitzExeterElsevier Scienceepub.articlehttp://purl.uni-rostock.de/rosdok/id00002123urn:nbn:de:gbv:28-rosdok_id00002123-110.18453/rosdok_id00002123Purpose: The accommodation process of the human eye is still a controversial subject. Coleman assumes that the lens, together with the zonula fibers, forms a diaphragm which is held in a catenary shape due to the pressure difference between the aqueous and vitreous body of the lens. The aim of the paper is to compare the results of two simulations (according to the Helmholtz and to the Coleman theories) with ultrasonographic data. Methods: An axisymmetric static finite element model of the lens was generated using the literature data for geometry, material properties and loads. The refractive power of the lens was calculated for two different ages (29 and 45 years). Results: The application of a pressure to the posterior lens surface did not yield an increase in refractive power change during accommodation. Rather a decrease in accommodation related refractive power was found. Conclusions: Physiologically relevant refractive power changes are obtained by a simulation in accordance with the Helmholtz theory. A simulation in accordance with the Coleman theory does not yield physiological values of refractive power change.20052005[Preprint]Vision research20052005Vision research20052005Volume 45 (2005), Issue 22, Pages 2910-29150042-6989Sonderdruck aus0042-698910.1016/j.visres.2005.05.030Erscheint auch alsVerlags-Ausgabe10.1016/j.visres.2005.05.030Heiner Martin; Rudolf Guthoff; Thom Terwee; Klaus-Peter Schmitz[xslt]Saxonrosdok/id00002123https://purl.uni-rostock.de/rosdok/id0000212365705221310.18453/rosdok_id00002123urn:nbn:de:gbv:28-rosdok_id00002123-1Heiner Martin, Rudolf Guthoff, Thom Terwee, Klaus-Peter SchmitzMartin Heiner, Guthoff Rudolf, Terwee Thom, Schmitz Klaus-PeterComparison of the accommodation theories of Coleman and of Helmholtz by finite element simulationsArtikelarticle[Preprint], Elsevier Science, 2005Purpose: The accommodation process of the human eye is still a controversial subject. Coleman assumes that the lens, together with the zonula fibers, forms a diaphragm which is held in a catenary shape due to the pressure difference between the aqueous and vitreous body of the lens. The aim of the…Heiner MartinRudolf GuthoffThom TerweeKlaus-Peter SchmitzComparison of the accommodation theories of Coleman and of Helmholtz by finite element simulationsVision researchUniversitätsbibliothek Rostockhttp://purl.uni-rostock.de/rosdok/id00002123HeinerMartin1958 -VerfasserInaut13386068XRudolfGuthoff1948 -VerfasserInaut108716899ThomTerweeVerfasserInautKlaus-PeterSchmitz1946 -VerfasserInaut132780844[purl]http://purl.uni-rostock.de/rosdok/id00002123[urn]urn:nbn:de:gbv:28-rosdok_id00002123-1[doi]10.18453/rosdok_id00002123open_access20052005epoch:21th_centuryrfc5646:endoctype:epub.articleaccesscondition:openaccessSDNB:610institution:unirostock.umrstate:published