Análise das alterações na curvatura corneana com implante intra-estromal: estudo experimental em coelhos
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNIFESP |
Texto Completo: | http://dx.doi.org/10.1590/S0004-27492007000200021 http://repositorio.unifesp.br/handle/11600/3588 |
Resumo: | PURPOSE: To evaluate the effect of intrastromal corneal ring implantation on corneal curvature in rabbits. METHODS: Thirty eyes of 15 rabbits were divided into two groups: group 1 with 7 animals and group 2 with 8 animals. The left eye underwent surgery and the right eye was used as control. Ultrasound pachymetry and corneal topography were performed prior to surgery. Anterior segment biomicroscopy and corneal topography were performed after surgery. In group 1, implantation of two ring segments was performed. In group 2, ring segments were implanted separately. Topographical findings, before and after surgery, were compared through quantitative and qualitative alterations and divided into four quadrants. RESULTS: Quantitative analysis showed no significant difference between the groups in the preoperative period. Experiment group 1 showed nasal (p=0.02) and temporal (p=0.04) corneal steepening, compared to control group 1. Experiment group 2 showed nasal and temporal corneal steepening and superior and inferior corneal flattening (p=0.02 for all quadrants) compared to the control group 2. Qualitative analysis showed uniform astigmatism in both control groups. In experiment group 1, against-the-rule regular symmetrical astigmatism was observed after surgery. In experiment group 2, against-the-rule regular asymmetrical astigmatism was found after implantation of the first ring segment, and against the rule regular symmetrical astigmatism was observed after implantation of the second segment. CONCLUSION: In this study, significant corneal flattening occurred in quadrants where ring segments extremities were located and corneal steepening was observed in quadrants where its body was located. Implantation of one ring segment induces asymmetrical astigmatism. |
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Análise das alterações na curvatura corneana com implante intra-estromal: estudo experimental em coelhosAnalysis of corneal curvature alteration following intrastromal corneal ring implantation: experimental study in rabbitsCorneal topographyProsthesis implantationCorneal stromaAstigmatismRabbitsTopografia da córneaImplante de próteseEstroma cornealAstigmatismoCoelhosPURPOSE: To evaluate the effect of intrastromal corneal ring implantation on corneal curvature in rabbits. METHODS: Thirty eyes of 15 rabbits were divided into two groups: group 1 with 7 animals and group 2 with 8 animals. The left eye underwent surgery and the right eye was used as control. Ultrasound pachymetry and corneal topography were performed prior to surgery. Anterior segment biomicroscopy and corneal topography were performed after surgery. In group 1, implantation of two ring segments was performed. In group 2, ring segments were implanted separately. Topographical findings, before and after surgery, were compared through quantitative and qualitative alterations and divided into four quadrants. RESULTS: Quantitative analysis showed no significant difference between the groups in the preoperative period. Experiment group 1 showed nasal (p=0.02) and temporal (p=0.04) corneal steepening, compared to control group 1. Experiment group 2 showed nasal and temporal corneal steepening and superior and inferior corneal flattening (p=0.02 for all quadrants) compared to the control group 2. Qualitative analysis showed uniform astigmatism in both control groups. In experiment group 1, against-the-rule regular symmetrical astigmatism was observed after surgery. In experiment group 2, against-the-rule regular asymmetrical astigmatism was found after implantation of the first ring segment, and against the rule regular symmetrical astigmatism was observed after implantation of the second segment. CONCLUSION: In this study, significant corneal flattening occurred in quadrants where ring segments extremities were located and corneal steepening was observed in quadrants where its body was located. Implantation of one ring segment induces asymmetrical astigmatism.OBJETIVO: Avaliar os efeitos do implante de anel corneano intra-estromal sobre a curvatura da córnea em coelhos. MÉTODOS: Trinta olhos de 15 coelhos foram divididos em 2 grupos: o primeiro com 7 e o segundo com 8 animais. O olho esquerdo foi operado e o direito serviu de controle nos 2 grupos. Paquimetria ultra-sônica e ceratoscopia computadorizada foram realizadas no pré-operatório; biomicroscopia de segmento anterior e ceratoscopia computadorizada, no pós-operatório. No grupo 1, foi realizado implante de dois segmentos de anel. No grupo 2, os segmentos foram implantados separadamente. Compararam-se os achados topográficos do pré e do pós-operatório por meio de alterações quantitativas e qualitativas em 4 quadrantes. RESULTADOS: A análise quantitativa no pré-operatório não demonstrou diferença significativa entre os grupos. No grupo experimento 1, houve abaulamento corneano nos setores nasal (p=0,02) e temporal (p=0,04), na comparação com o grupo controle 1. No grupo experimento 2, observou-se o mesmo fato (p=0,02 nasal e temporal) quando comparado ao grupo controle 2. Após implante do segundo segmento, observou-se aplanamento significativo nos setores superior e inferior e abaulamento nos setores nasal e temporal (p=0,02 para todos os quadrantes). Pela análise qualitativa, observou-se astigmatismo uniforme nos grupos controle 1 e 2. No grupo experimento 1, observou-se astigmatismo simétrico contra a regra. No grupo experimento 2, observou-se astigmatismo contra a regra assimétrico, após implante do primeiro segmento, e simétrico, após o segundo implante. CONCLUSÃO: Observou-se aplanamento corneano significativo no eixo onde se localizam as extremidades do segmento de anel e abaulamento nos setores onde se localiza seu corpo. O implante de apenas um segmento induz astigmatismo assimétrico.Universidade Federal do ParanáUFPRUniversidade Federal de São Paulo (UNIFESP)Faculdade Evangélica do ParanáUNIFESPHospital de Olhos do ParanáUNIFESPSciELOConselho Brasileiro de OftalmologiaUniversidade Federal do ParanáUFPRUniversidade Federal de São Paulo (UNIFESP)Faculdade Evangélica do ParanáHospital de Olhos do ParanáGodoy, Cinara Sakuma De OliveiraWahab, Samia AliMoreira, Hamilton [UNIFESP]Moreira, Luciane BugmanGodoy, Glaucio De [UNIFESP]2015-06-14T13:36:47Z2015-06-14T13:36:47Z2007-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion303-311application/pdfhttp://dx.doi.org/10.1590/S0004-27492007000200021Arquivos Brasileiros de Oftalmologia. Conselho Brasileiro de Oftalmologia, v. 70, n. 2, p. 303-311, 2007.10.1590/S0004-27492007000200021S0004-27492007000200021.pdf0004-2749S0004-27492007000200021http://repositorio.unifesp.br/handle/11600/3588porArquivos Brasileiros de Oftalmologiainfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UNIFESPinstname:Universidade Federal de São Paulo (UNIFESP)instacron:UNIFESP2024-07-28T12:39:45Zoai:repositorio.unifesp.br/:11600/3588Repositório InstitucionalPUBhttp://www.repositorio.unifesp.br/oai/requestbiblioteca.csp@unifesp.bropendoar:34652024-07-28T12:39:45Repositório Institucional da UNIFESP - Universidade Federal de São Paulo (UNIFESP)false |
dc.title.none.fl_str_mv |
Análise das alterações na curvatura corneana com implante intra-estromal: estudo experimental em coelhos Analysis of corneal curvature alteration following intrastromal corneal ring implantation: experimental study in rabbits |
title |
Análise das alterações na curvatura corneana com implante intra-estromal: estudo experimental em coelhos |
spellingShingle |
Análise das alterações na curvatura corneana com implante intra-estromal: estudo experimental em coelhos Godoy, Cinara Sakuma De Oliveira Corneal topography Prosthesis implantation Corneal stroma Astigmatism Rabbits Topografia da córnea Implante de prótese Estroma corneal Astigmatismo Coelhos |
title_short |
Análise das alterações na curvatura corneana com implante intra-estromal: estudo experimental em coelhos |
title_full |
Análise das alterações na curvatura corneana com implante intra-estromal: estudo experimental em coelhos |
title_fullStr |
Análise das alterações na curvatura corneana com implante intra-estromal: estudo experimental em coelhos |
title_full_unstemmed |
Análise das alterações na curvatura corneana com implante intra-estromal: estudo experimental em coelhos |
title_sort |
Análise das alterações na curvatura corneana com implante intra-estromal: estudo experimental em coelhos |
author |
Godoy, Cinara Sakuma De Oliveira |
author_facet |
Godoy, Cinara Sakuma De Oliveira Wahab, Samia Ali Moreira, Hamilton [UNIFESP] Moreira, Luciane Bugman Godoy, Glaucio De [UNIFESP] |
author_role |
author |
author2 |
Wahab, Samia Ali Moreira, Hamilton [UNIFESP] Moreira, Luciane Bugman Godoy, Glaucio De [UNIFESP] |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Federal do Paraná UFPR Universidade Federal de São Paulo (UNIFESP) Faculdade Evangélica do Paraná Hospital de Olhos do Paraná |
dc.contributor.author.fl_str_mv |
Godoy, Cinara Sakuma De Oliveira Wahab, Samia Ali Moreira, Hamilton [UNIFESP] Moreira, Luciane Bugman Godoy, Glaucio De [UNIFESP] |
dc.subject.por.fl_str_mv |
Corneal topography Prosthesis implantation Corneal stroma Astigmatism Rabbits Topografia da córnea Implante de prótese Estroma corneal Astigmatismo Coelhos |
topic |
Corneal topography Prosthesis implantation Corneal stroma Astigmatism Rabbits Topografia da córnea Implante de prótese Estroma corneal Astigmatismo Coelhos |
description |
PURPOSE: To evaluate the effect of intrastromal corneal ring implantation on corneal curvature in rabbits. METHODS: Thirty eyes of 15 rabbits were divided into two groups: group 1 with 7 animals and group 2 with 8 animals. The left eye underwent surgery and the right eye was used as control. Ultrasound pachymetry and corneal topography were performed prior to surgery. Anterior segment biomicroscopy and corneal topography were performed after surgery. In group 1, implantation of two ring segments was performed. In group 2, ring segments were implanted separately. Topographical findings, before and after surgery, were compared through quantitative and qualitative alterations and divided into four quadrants. RESULTS: Quantitative analysis showed no significant difference between the groups in the preoperative period. Experiment group 1 showed nasal (p=0.02) and temporal (p=0.04) corneal steepening, compared to control group 1. Experiment group 2 showed nasal and temporal corneal steepening and superior and inferior corneal flattening (p=0.02 for all quadrants) compared to the control group 2. Qualitative analysis showed uniform astigmatism in both control groups. In experiment group 1, against-the-rule regular symmetrical astigmatism was observed after surgery. In experiment group 2, against-the-rule regular asymmetrical astigmatism was found after implantation of the first ring segment, and against the rule regular symmetrical astigmatism was observed after implantation of the second segment. CONCLUSION: In this study, significant corneal flattening occurred in quadrants where ring segments extremities were located and corneal steepening was observed in quadrants where its body was located. Implantation of one ring segment induces asymmetrical astigmatism. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007-03-01 2015-06-14T13:36:47Z 2015-06-14T13:36:47Z |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1590/S0004-27492007000200021 Arquivos Brasileiros de Oftalmologia. Conselho Brasileiro de Oftalmologia, v. 70, n. 2, p. 303-311, 2007. 10.1590/S0004-27492007000200021 S0004-27492007000200021.pdf 0004-2749 S0004-27492007000200021 http://repositorio.unifesp.br/handle/11600/3588 |
url |
http://dx.doi.org/10.1590/S0004-27492007000200021 http://repositorio.unifesp.br/handle/11600/3588 |
identifier_str_mv |
Arquivos Brasileiros de Oftalmologia. Conselho Brasileiro de Oftalmologia, v. 70, n. 2, p. 303-311, 2007. 10.1590/S0004-27492007000200021 S0004-27492007000200021.pdf 0004-2749 S0004-27492007000200021 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
Arquivos Brasileiros de Oftalmologia |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
303-311 application/pdf |
dc.publisher.none.fl_str_mv |
Conselho Brasileiro de Oftalmologia |
publisher.none.fl_str_mv |
Conselho Brasileiro de Oftalmologia |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UNIFESP instname:Universidade Federal de São Paulo (UNIFESP) instacron:UNIFESP |
instname_str |
Universidade Federal de São Paulo (UNIFESP) |
instacron_str |
UNIFESP |
institution |
UNIFESP |
reponame_str |
Repositório Institucional da UNIFESP |
collection |
Repositório Institucional da UNIFESP |
repository.name.fl_str_mv |
Repositório Institucional da UNIFESP - Universidade Federal de São Paulo (UNIFESP) |
repository.mail.fl_str_mv |
biblioteca.csp@unifesp.br |
_version_ |
1814268413707550720 |