Keratometric index variation in keratoconic eyes before and after Intacs-SK implantation
Autor(a) principal: | |
---|---|
Data de Publicação: | 2015 |
Outros Autores: | , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | https://doi.org/10.48560/rspo.6708 |
Resumo: | Purpose: To evaluate the variation in keratometric index (KI) in eyes with keratoconus (KC), before and after the implantation of Intacs SK (Addition Technology Inc); Patients and Methods: 19 eyes with keratoconus, before and after Intacs-SK implantation (minimum follow-up of 6 months), and a control group of 26 healthy eyes were retrospectively studied. The anterior (ARC) and posterior radius of curvature (PRC), the ratio between them (ratio ARC/PRC) and the mean pupil power (MPP) were evaluated for the central 3 mm, using a tomographic system combining Scheimpflug photography and placido-disc analysis. The KI was calculated using the paraxial formula for thin lens, assuming the MPP (accessed by ray-tracing) as the true corneal power; Results: The mean values for ARC, PRC, ratio ARC/PRC and KI were, respectively, for the control group and for the keratoconic eyes before surgery: 7,71±0,30 e 6,78±0,52mm (p<0,05); 6,35±0,67 e 5,59±0,86mm (p<0,05), 1,236±0,220 e 1,234±0,159 (p>0,05); e 1,3317±0,0031 e 1,3321±0,0521 (p>0,05). In keratoconic eyes, after a mean follow-up of 9,47 months after Intacs-SK implantation, the ARC increased to 7,26±0,56mm (p<0,001), and the PRC increased to 5,63±0,95mm(p>0,05), which was not statistically significant. The mean ratio ARC/PRC increased to 1,314±0,190 (p<0,05) and the mean KI decreased to 1,3285±0,0817 (p<0,05); Conclusions: After Intacs-SK implantation, only the anterior cornea surface seems to be significantly flattened, with a consequent decrease in the KI. Thus, the standardized KI values may not be suitable for intra-ocular lens calculation in these patients. No statistical differences were found in the ratio ARC/PRC and in the KI between normal and keratoconic eyes. |
id |
RCAP_cbd27fd2e5d60618cf1157298c15a5b8 |
---|---|
oai_identifier_str |
oai:ojs.revistas.rcaap.pt:article/6708 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
spelling |
Keratometric index variation in keratoconic eyes before and after Intacs-SK implantationArtigos OriginaisPurpose: To evaluate the variation in keratometric index (KI) in eyes with keratoconus (KC), before and after the implantation of Intacs SK (Addition Technology Inc); Patients and Methods: 19 eyes with keratoconus, before and after Intacs-SK implantation (minimum follow-up of 6 months), and a control group of 26 healthy eyes were retrospectively studied. The anterior (ARC) and posterior radius of curvature (PRC), the ratio between them (ratio ARC/PRC) and the mean pupil power (MPP) were evaluated for the central 3 mm, using a tomographic system combining Scheimpflug photography and placido-disc analysis. The KI was calculated using the paraxial formula for thin lens, assuming the MPP (accessed by ray-tracing) as the true corneal power; Results: The mean values for ARC, PRC, ratio ARC/PRC and KI were, respectively, for the control group and for the keratoconic eyes before surgery: 7,71±0,30 e 6,78±0,52mm (p<0,05); 6,35±0,67 e 5,59±0,86mm (p<0,05), 1,236±0,220 e 1,234±0,159 (p>0,05); e 1,3317±0,0031 e 1,3321±0,0521 (p>0,05). In keratoconic eyes, after a mean follow-up of 9,47 months after Intacs-SK implantation, the ARC increased to 7,26±0,56mm (p<0,001), and the PRC increased to 5,63±0,95mm(p>0,05), which was not statistically significant. The mean ratio ARC/PRC increased to 1,314±0,190 (p<0,05) and the mean KI decreased to 1,3285±0,0817 (p<0,05); Conclusions: After Intacs-SK implantation, only the anterior cornea surface seems to be significantly flattened, with a consequent decrease in the KI. Thus, the standardized KI values may not be suitable for intra-ocular lens calculation in these patients. No statistical differences were found in the ratio ARC/PRC and in the KI between normal and keratoconic eyes.Ajnet2015-12-25T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttps://doi.org/10.48560/rspo.6708eng1646-69501646-6950Menezes, CarlosRodrigues, PedroResende, Rui AvelinoLemos, José AlbertoCoelho, PedroVieira, Bruna CardosoSerino, JosefinaGonçalves, RitaTenedório, Paulainfo: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:RCAAP2022-09-22T17:05:51Zoai:ojs.revistas.rcaap.pt:article/6708Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:01:28.186711Repositório 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 |
Keratometric index variation in keratoconic eyes before and after Intacs-SK implantation |
title |
Keratometric index variation in keratoconic eyes before and after Intacs-SK implantation |
spellingShingle |
Keratometric index variation in keratoconic eyes before and after Intacs-SK implantation Menezes, Carlos Artigos Originais |
title_short |
Keratometric index variation in keratoconic eyes before and after Intacs-SK implantation |
title_full |
Keratometric index variation in keratoconic eyes before and after Intacs-SK implantation |
title_fullStr |
Keratometric index variation in keratoconic eyes before and after Intacs-SK implantation |
title_full_unstemmed |
Keratometric index variation in keratoconic eyes before and after Intacs-SK implantation |
title_sort |
Keratometric index variation in keratoconic eyes before and after Intacs-SK implantation |
author |
Menezes, Carlos |
author_facet |
Menezes, Carlos Rodrigues, Pedro Resende, Rui Avelino Lemos, José Alberto Coelho, Pedro Vieira, Bruna Cardoso Serino, Josefina Gonçalves, Rita Tenedório, Paula |
author_role |
author |
author2 |
Rodrigues, Pedro Resende, Rui Avelino Lemos, José Alberto Coelho, Pedro Vieira, Bruna Cardoso Serino, Josefina Gonçalves, Rita Tenedório, Paula |
author2_role |
author author author author author author author author |
dc.contributor.author.fl_str_mv |
Menezes, Carlos Rodrigues, Pedro Resende, Rui Avelino Lemos, José Alberto Coelho, Pedro Vieira, Bruna Cardoso Serino, Josefina Gonçalves, Rita Tenedório, Paula |
dc.subject.por.fl_str_mv |
Artigos Originais |
topic |
Artigos Originais |
description |
Purpose: To evaluate the variation in keratometric index (KI) in eyes with keratoconus (KC), before and after the implantation of Intacs SK (Addition Technology Inc); Patients and Methods: 19 eyes with keratoconus, before and after Intacs-SK implantation (minimum follow-up of 6 months), and a control group of 26 healthy eyes were retrospectively studied. The anterior (ARC) and posterior radius of curvature (PRC), the ratio between them (ratio ARC/PRC) and the mean pupil power (MPP) were evaluated for the central 3 mm, using a tomographic system combining Scheimpflug photography and placido-disc analysis. The KI was calculated using the paraxial formula for thin lens, assuming the MPP (accessed by ray-tracing) as the true corneal power; Results: The mean values for ARC, PRC, ratio ARC/PRC and KI were, respectively, for the control group and for the keratoconic eyes before surgery: 7,71±0,30 e 6,78±0,52mm (p<0,05); 6,35±0,67 e 5,59±0,86mm (p<0,05), 1,236±0,220 e 1,234±0,159 (p>0,05); e 1,3317±0,0031 e 1,3321±0,0521 (p>0,05). In keratoconic eyes, after a mean follow-up of 9,47 months after Intacs-SK implantation, the ARC increased to 7,26±0,56mm (p<0,001), and the PRC increased to 5,63±0,95mm(p>0,05), which was not statistically significant. The mean ratio ARC/PRC increased to 1,314±0,190 (p<0,05) and the mean KI decreased to 1,3285±0,0817 (p<0,05); Conclusions: After Intacs-SK implantation, only the anterior cornea surface seems to be significantly flattened, with a consequent decrease in the KI. Thus, the standardized KI values may not be suitable for intra-ocular lens calculation in these patients. No statistical differences were found in the ratio ARC/PRC and in the KI between normal and keratoconic eyes. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-12-25T00:00:00Z |
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://doi.org/10.48560/rspo.6708 |
url |
https://doi.org/10.48560/rspo.6708 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
1646-6950 1646-6950 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Ajnet |
publisher.none.fl_str_mv |
Ajnet |
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 |
|
_version_ |
1799130479691038720 |