Impact of internal curvature gradient on the power and accommodation of the crystalline lens

Human crystalline lens has a layered, shell-like structure with the refractive index increasing from cortex to nucleus (gradient index or GRIN structure). Moreover, every iso-indicial layer has a certain curvature which also varies from cortex to nucleus, with a gradient of curvature (G). In the pre...

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Detalles Bibliográficos
Autores: Navarro, R., López-Gil, N.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Institución:Universidad de Zaragoza
Repositorio:Zaguán. Repositorio Digital de la Universidad de Zaragoza
OAI Identifier:oai:zaguan.unizar.es:60989
Acceso en línea:http://zaguan.unizar.es/record/60989
Access Level:acceso abierto
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spelling Impact of internal curvature gradient on the power and accommodation of the crystalline lensNavarro, R.López-Gil, N.Human crystalline lens has a layered, shell-like structure with the refractive index increasing from cortex to nucleus (gradient index or GRIN structure). Moreover, every iso-indicial layer has a certain curvature which also varies from cortex to nucleus, with a gradient of curvature (G). In the present manuscript, the role of G on the lens power is investigated along with its implications regarding the lens paradox (change of lens power with age) and intra-capsular accommodation mechanism (larger than expected changes of lens power during accommodation compared to a homogenous lens). To this end, a simplified formulation of paraxial lens power based on thin lens approximation is developed and applied to the anterior and posterior parts of the lens. The main theoretical result is that the power of both anterior and posterior lens is given by the sum of the power of a lens with a homogeneous refractive index equal to that of the nucleus and power associated with the contribution of the internal GRIN structure, which depends on G. This general result suggests that the sign of G is fundamental in increasing or decreasing the lens power.We found that the curvature gradient has a strong impact on lens power, helping to explain both the lens paradox and intra-capsular accommodation mechanism.2017info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://zaguan.unizar.es/record/60989reponame:Zaguán. Repositorio Digital de la Universidad de Zaragozainstname:Universidad de ZaragozaInglésinfo:eu-repo/grantAgreement/EC/FP7/309416info:eu-repo/semantics/openAccessoai:zaguan.unizar.es:609892026-05-29T13:59:51Z
dc.title.none.fl_str_mv Impact of internal curvature gradient on the power and accommodation of the crystalline lens
title Impact of internal curvature gradient on the power and accommodation of the crystalline lens
spellingShingle Impact of internal curvature gradient on the power and accommodation of the crystalline lens
Navarro, R.
title_short Impact of internal curvature gradient on the power and accommodation of the crystalline lens
title_full Impact of internal curvature gradient on the power and accommodation of the crystalline lens
title_fullStr Impact of internal curvature gradient on the power and accommodation of the crystalline lens
title_full_unstemmed Impact of internal curvature gradient on the power and accommodation of the crystalline lens
title_sort Impact of internal curvature gradient on the power and accommodation of the crystalline lens
dc.creator.none.fl_str_mv Navarro, R.
López-Gil, N.
author Navarro, R.
author_facet Navarro, R.
López-Gil, N.
author_role author
author2 López-Gil, N.
author2_role author
description Human crystalline lens has a layered, shell-like structure with the refractive index increasing from cortex to nucleus (gradient index or GRIN structure). Moreover, every iso-indicial layer has a certain curvature which also varies from cortex to nucleus, with a gradient of curvature (G). In the present manuscript, the role of G on the lens power is investigated along with its implications regarding the lens paradox (change of lens power with age) and intra-capsular accommodation mechanism (larger than expected changes of lens power during accommodation compared to a homogenous lens). To this end, a simplified formulation of paraxial lens power based on thin lens approximation is developed and applied to the anterior and posterior parts of the lens. The main theoretical result is that the power of both anterior and posterior lens is given by the sum of the power of a lens with a homogeneous refractive index equal to that of the nucleus and power associated with the contribution of the internal GRIN structure, which depends on G. This general result suggests that the sign of G is fundamental in increasing or decreasing the lens power.We found that the curvature gradient has a strong impact on lens power, helping to explain both the lens paradox and intra-capsular accommodation mechanism.
publishDate 2017
dc.date.none.fl_str_mv 2017
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dc.identifier.none.fl_str_mv http://zaguan.unizar.es/record/60989
url http://zaguan.unizar.es/record/60989
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/EC/FP7/309416
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
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publisher.none.fl_str_mv
dc.source.none.fl_str_mv reponame:Zaguán. Repositorio Digital de la Universidad de Zaragoza
instname:Universidad de Zaragoza
instname_str Universidad de Zaragoza
reponame_str Zaguán. Repositorio Digital de la Universidad de Zaragoza
collection Zaguán. Repositorio Digital de la Universidad de Zaragoza
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