Errors associated with IOLmaster biometry as a function of internal ocular dimensions
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | https://hdl.handle.net/1822/37098 |
Resumo: | To evaluate the error in the estimation of axial length (AL) with the IOLMaster partial coherence interferometry (PCI) biometer and obtain a correction factor that varies as a function of AL and crystalline lens thickness (LT). Methods: Optical simulations were produced for theoretical eyes using Zemax-EE software. Thirty-three combinations including eleven different AL (from 20 mm to 30 mm in 1 mm steps) and three different LT (3.6 mm, 4.2 mm and 4.8 mm) were used. Errors were obtained comparing the AL measured for a constant equivalent refractive index of 1.3549 and for the actual combinations of indices and intra-ocular dimensions of LT and AL in each model eye. Results: In the range from 20 mm to 30 mm AL and 3.6---4.8 mm LT, the instrument measurements yielded an error between −0.043 mm and +0.089 mm. Regression analyses for the three LT condition were combined in order to derive a correction factor as a function of the instrument measured AL for each combination of AL and LT in the theoretical eye. Conclusions: The assumption of a single ‘‘average’’ refractive index in the estimation of AL by the IOLMaster PCI biometer only induces very small errors in a wide range of combinations of ocular dimensions. Even so, the accurate estimation of those errors may help to improve accuracy of intra-ocular lens calculations through exact ray tracing, particularly in longer eyes and eyes with thicker or thinner crystalline lenses. |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Errors associated with IOLmaster biometry as a function of internal ocular dimensionsIntra-ocular lens calculationIOL calculationAxial length measurementTo evaluate the error in the estimation of axial length (AL) with the IOLMaster partial coherence interferometry (PCI) biometer and obtain a correction factor that varies as a function of AL and crystalline lens thickness (LT). Methods: Optical simulations were produced for theoretical eyes using Zemax-EE software. Thirty-three combinations including eleven different AL (from 20 mm to 30 mm in 1 mm steps) and three different LT (3.6 mm, 4.2 mm and 4.8 mm) were used. Errors were obtained comparing the AL measured for a constant equivalent refractive index of 1.3549 and for the actual combinations of indices and intra-ocular dimensions of LT and AL in each model eye. Results: In the range from 20 mm to 30 mm AL and 3.6---4.8 mm LT, the instrument measurements yielded an error between −0.043 mm and +0.089 mm. Regression analyses for the three LT condition were combined in order to derive a correction factor as a function of the instrument measured AL for each combination of AL and LT in the theoretical eye. Conclusions: The assumption of a single ‘‘average’’ refractive index in the estimation of AL by the IOLMaster PCI biometer only induces very small errors in a wide range of combinations of ocular dimensions. Even so, the accurate estimation of those errors may help to improve accuracy of intra-ocular lens calculations through exact ray tracing, particularly in longer eyes and eyes with thicker or thinner crystalline lenses.(undefined)Elsevier DoymaUniversidade do MinhoRibeiro, Miguel António FariaFerreira, Daniela LopesGil, Norberto LopezJorge, JorgeGonzález-Méijome, José Manuel20142014-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/1822/37098engFaria-Ribeiro, Miguel; Lopes-Ferreira, Daniela; López-Gil, Norberto; Jorge, Jorge; González-Méijome, José Manuel. Errors Associated with IOLMaster Biometry as a Function of Internal Ocular Dimensions, Journal of Optometry, 7, 2, 75-78, 2014.1888-429610.1016/j.optom.2013.12.00524766863info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-05-11T05:26:14Zoai:repositorium.sdum.uminho.pt:1822/37098Portal AgregadorONGhttps://www.rcaap.pt/oai/openairemluisa.alvim@gmail.comopendoar:71602024-05-11T05:26:14Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Errors associated with IOLmaster biometry as a function of internal ocular dimensions |
title |
Errors associated with IOLmaster biometry as a function of internal ocular dimensions |
spellingShingle |
Errors associated with IOLmaster biometry as a function of internal ocular dimensions Ribeiro, Miguel António Faria Intra-ocular lens calculation IOL calculation Axial length measurement |
title_short |
Errors associated with IOLmaster biometry as a function of internal ocular dimensions |
title_full |
Errors associated with IOLmaster biometry as a function of internal ocular dimensions |
title_fullStr |
Errors associated with IOLmaster biometry as a function of internal ocular dimensions |
title_full_unstemmed |
Errors associated with IOLmaster biometry as a function of internal ocular dimensions |
title_sort |
Errors associated with IOLmaster biometry as a function of internal ocular dimensions |
author |
Ribeiro, Miguel António Faria |
author_facet |
Ribeiro, Miguel António Faria Ferreira, Daniela Lopes Gil, Norberto Lopez Jorge, Jorge González-Méijome, José Manuel |
author_role |
author |
author2 |
Ferreira, Daniela Lopes Gil, Norberto Lopez Jorge, Jorge González-Méijome, José Manuel |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Ribeiro, Miguel António Faria Ferreira, Daniela Lopes Gil, Norberto Lopez Jorge, Jorge González-Méijome, José Manuel |
dc.subject.por.fl_str_mv |
Intra-ocular lens calculation IOL calculation Axial length measurement |
topic |
Intra-ocular lens calculation IOL calculation Axial length measurement |
description |
To evaluate the error in the estimation of axial length (AL) with the IOLMaster partial coherence interferometry (PCI) biometer and obtain a correction factor that varies as a function of AL and crystalline lens thickness (LT). Methods: Optical simulations were produced for theoretical eyes using Zemax-EE software. Thirty-three combinations including eleven different AL (from 20 mm to 30 mm in 1 mm steps) and three different LT (3.6 mm, 4.2 mm and 4.8 mm) were used. Errors were obtained comparing the AL measured for a constant equivalent refractive index of 1.3549 and for the actual combinations of indices and intra-ocular dimensions of LT and AL in each model eye. Results: In the range from 20 mm to 30 mm AL and 3.6---4.8 mm LT, the instrument measurements yielded an error between −0.043 mm and +0.089 mm. Regression analyses for the three LT condition were combined in order to derive a correction factor as a function of the instrument measured AL for each combination of AL and LT in the theoretical eye. Conclusions: The assumption of a single ‘‘average’’ refractive index in the estimation of AL by the IOLMaster PCI biometer only induces very small errors in a wide range of combinations of ocular dimensions. Even so, the accurate estimation of those errors may help to improve accuracy of intra-ocular lens calculations through exact ray tracing, particularly in longer eyes and eyes with thicker or thinner crystalline lenses. |
publishDate |
2014 |
dc.date.none.fl_str_mv |
2014 2014-01-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://hdl.handle.net/1822/37098 |
url |
https://hdl.handle.net/1822/37098 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Faria-Ribeiro, Miguel; Lopes-Ferreira, Daniela; López-Gil, Norberto; Jorge, Jorge; González-Méijome, José Manuel. Errors Associated with IOLMaster Biometry as a Function of Internal Ocular Dimensions, Journal of Optometry, 7, 2, 75-78, 2014. 1888-4296 10.1016/j.optom.2013.12.005 24766863 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier Doyma |
publisher.none.fl_str_mv |
Elsevier Doyma |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
mluisa.alvim@gmail.com |
_version_ |
1817544620475678720 |