Comparison of the accommodation theories of Coleman and of Helmholtz by finite element simulations
Martin, Heiner
1958-
VerfasserIn
aut
Guthoff, Rudolf
1948-
VerfasserIn
aut
Terwee, Thom
VerfasserIn
aut
Schmitz, Klaus-Peter
1946-
VerfasserIn
aut
text
Text
gw
2005
monographic
XA-DE-MV
[Preprint]
Exeter
Elsevier Science
publisher
2005
Rostock
Universitätsbibliothek Rostock
distributor
eng
Online-Ressource (6 Seiten)
Purpose: 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.<eng>
Heiner Martin; Rudolf Guthoff; Thom Terwee; Klaus-Peter Schmitz
610
http://purl.uni-rostock.de/rosdok/id00002123
Vision research
2005
0042-6989
Volume 45 (2005), Issue 22, Pages 2910-2915
Verlags-Ausgabe
10.1016/j.visres.2005.05.030
urn:nbn:de:gbv:28-rosdok_id00002123-1
10.18453/rosdok_id00002123
837871308
rda
DE-627
110503
657052213
20251223T225254.0
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