Peripheral refraction in myopic patients after Orthokeratology

Detalhes bibliográficos
Autor(a) principal: Queirós, A.
Data de Publicação: 2010
Outros Autores: González-Méijome, José Manuel, Jorge, Jorge, Villa-Collar, César, Gutiérrez, Ángel Ramón
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/1822/11704
Resumo: Purpose: The purpose of this study was to characterize the central and peripheral refraction across the horizontal meridian of the visual field before and after myopic corneal refractive therapy (CRT) with contact lenses. Methods: Twenty-eight right eyes (mean age±SD = 24.6±6.3 years) were fitted with Paragon CRT contact lenses to treat myopia between -0.88 and -5.25D of spherical equivalent. Along with a complete set of examination procedures to assess suitability for treatment, the central and peripheral refraction was measured along the horizontal meridian up to 35º of eccentricity in the nasal and temporal retinal area in 5º steps. Results: Baseline central average spherical equivalent (M) measured by subjective refraction changed from -1.95±1.27D to -0.38±0.67D. Changes in M component ranged between 1.42±0.89D at center to 0.43±0.88D at 20º in the temporal retina (p<0.002). At 25º to both sides of the central refraction measurement, peripheral refraction after treatment was not statistically different from baseline values (p>0.351). Beyond the 25º limit, M component changed in the myopic direction up to -1.11±0.88D at 35º in temporal retina (p<0.001). Treatment induced was symmetric between nasal and temporal visual field along the horizontal meridian (p>0.05 for all eccentricities). Furthermore, the degree of myopic increase in spherical equivalent for 30º (r2=0.573, p<0.001) and 35º (r2=0.645, p<0.001) eccentric refraction was highly correlated with axial spherical equivalent at baseline. Conclusions: CRT inverts the pattern of peripheral refraction in spherical equivalent refraction creating a treatment area of myopic reduction within the central 25º of visual field, and a myopic shift beyond the 25º. In peripheral refraction for 30º and 35º, the amount of myopia induced in terms of spherical equivalent has an almost 1:1 relationship with the amount of baseline spherical equivalent refraction to be corrected.
id RCAP_2bc8c30bcfd529880384419316ac3e50
oai_identifier_str oai:repositorium.sdum.uminho.pt:1822/11704
network_acronym_str RCAP
network_name_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository_id_str 7160
spelling Peripheral refraction in myopic patients after OrthokeratologyPeripheral refractionMyopia progressionCorneal refractive therapyOrthokeratologyScience & TechnologyPurpose: The purpose of this study was to characterize the central and peripheral refraction across the horizontal meridian of the visual field before and after myopic corneal refractive therapy (CRT) with contact lenses. Methods: Twenty-eight right eyes (mean age±SD = 24.6±6.3 years) were fitted with Paragon CRT contact lenses to treat myopia between -0.88 and -5.25D of spherical equivalent. Along with a complete set of examination procedures to assess suitability for treatment, the central and peripheral refraction was measured along the horizontal meridian up to 35º of eccentricity in the nasal and temporal retinal area in 5º steps. Results: Baseline central average spherical equivalent (M) measured by subjective refraction changed from -1.95±1.27D to -0.38±0.67D. Changes in M component ranged between 1.42±0.89D at center to 0.43±0.88D at 20º in the temporal retina (p<0.002). At 25º to both sides of the central refraction measurement, peripheral refraction after treatment was not statistically different from baseline values (p>0.351). Beyond the 25º limit, M component changed in the myopic direction up to -1.11±0.88D at 35º in temporal retina (p<0.001). Treatment induced was symmetric between nasal and temporal visual field along the horizontal meridian (p>0.05 for all eccentricities). Furthermore, the degree of myopic increase in spherical equivalent for 30º (r2=0.573, p<0.001) and 35º (r2=0.645, p<0.001) eccentric refraction was highly correlated with axial spherical equivalent at baseline. Conclusions: CRT inverts the pattern of peripheral refraction in spherical equivalent refraction creating a treatment area of myopic reduction within the central 25º of visual field, and a myopic shift beyond the 25º. In peripheral refraction for 30º and 35º, the amount of myopia induced in terms of spherical equivalent has an almost 1:1 relationship with the amount of baseline spherical equivalent refraction to be corrected.Objectivo: O objectivo deste estudo foi caracterizar a refracção central e periférica através do meridiano horizontal do campo visual, antes e depois da Terapia Refractiva Corneal à miopia (CRT) com lentes de contacto. Métodos: Foram adaptados com lentes de contacto Paragon CRT vinte e oito olhos direitos de 28 indivíduos (com uma idade média ± DP = 24,6 ± 6,3 anos) para corrigir miopia entre – 0.88 e – 5.25 D de equivalente esférico. Juntamente com um conjunto completo de exames para avaliar a possibilidade de tratamento, foi medida a refracção central e periférica ao longo do meridiano horizontal até aos 35º de excentricidade na área da retina nasal e temporal em intervalos de 5º. Resultados: A média do equivalente esférico central no estado inicial (M) medido pela refracção subjectiva mudou de - 1,95 ± 1,27 D para - 0,38 ± 0,67 D. As alterações no componente M variaram entre +1,42 ± 0,89 D no centro e +0,43 ± 0,88 D a 20º na retina temporal (p < 0,002). A refracção periférica após o tratamento não foi estatisticamente diferente dos valores do estado inicial (p > 0,351), a 25º para ambos os lados da medida da refracção central. Para além do limite de 25º, o componente M mudou no sentido da miopia até – 1,11 ± 0,88 D a 35º na retina temporal (p < 0,001). O tratamento induzido foi simétrico entre o campo visual nasal e temporal ao longo do meridiano horizontal (p > 0,050 para todas as excentricidades). Além disso, o aumento do valor de miopia em equivalente esférico para 30º (r2 = 0,573, p < 0,001) e 35º (r2 = 0,645, p < 0,001) de refracção excêntrica foi altamente correlacionado com o equivalente esférico do estado inicial. Conclusões: As lentes CRT invertem o padrão da refracção periférica no equivalente esférico da refracção, criando uma área de tratamento na redução da miopia dentro de 25º do campo visual central, e um deslocamento miópico para além de 25º. Na refracção periférica para 30º e 35º, o valor da miopia induzida em termos de equivalente esférico, tem uma relação de quase 1:1 com o valor da refracção do equivalente esférico do estado inicial a ser corrigido.Ministério da Ciência e do Ensino SuperiorFundação para a Ciência e a Tecnologia (FCT) - Bolsa SFRH/BD/61768/2009Lippincott, Williams & WilkinsUniversidade do MinhoQueirós, A.González-Méijome, José ManuelJorge, JorgeVilla-Collar, CésarGutiérrez, Ángel Ramón2010-052010-05-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/11704eng"Optometry and Vision Science." ISSN 1040-5488. 87:5 (Maio 2010) 323-329.1040-548810.1097/OPX.0b013e3181d951f720375751http://journals.lww.com/optvissci/pages/default.aspxinfo: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:RCAAP2023-07-21T12:42:55Zoai:repositorium.sdum.uminho.pt:1822/11704Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:40:16.635980Repositório 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 Peripheral refraction in myopic patients after Orthokeratology
title Peripheral refraction in myopic patients after Orthokeratology
spellingShingle Peripheral refraction in myopic patients after Orthokeratology
Queirós, A.
Peripheral refraction
Myopia progression
Corneal refractive therapy
Orthokeratology
Science & Technology
title_short Peripheral refraction in myopic patients after Orthokeratology
title_full Peripheral refraction in myopic patients after Orthokeratology
title_fullStr Peripheral refraction in myopic patients after Orthokeratology
title_full_unstemmed Peripheral refraction in myopic patients after Orthokeratology
title_sort Peripheral refraction in myopic patients after Orthokeratology
author Queirós, A.
author_facet Queirós, A.
González-Méijome, José Manuel
Jorge, Jorge
Villa-Collar, César
Gutiérrez, Ángel Ramón
author_role author
author2 González-Méijome, José Manuel
Jorge, Jorge
Villa-Collar, César
Gutiérrez, Ángel Ramón
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Universidade do Minho
dc.contributor.author.fl_str_mv Queirós, A.
González-Méijome, José Manuel
Jorge, Jorge
Villa-Collar, César
Gutiérrez, Ángel Ramón
dc.subject.por.fl_str_mv Peripheral refraction
Myopia progression
Corneal refractive therapy
Orthokeratology
Science & Technology
topic Peripheral refraction
Myopia progression
Corneal refractive therapy
Orthokeratology
Science & Technology
description Purpose: The purpose of this study was to characterize the central and peripheral refraction across the horizontal meridian of the visual field before and after myopic corneal refractive therapy (CRT) with contact lenses. Methods: Twenty-eight right eyes (mean age±SD = 24.6±6.3 years) were fitted with Paragon CRT contact lenses to treat myopia between -0.88 and -5.25D of spherical equivalent. Along with a complete set of examination procedures to assess suitability for treatment, the central and peripheral refraction was measured along the horizontal meridian up to 35º of eccentricity in the nasal and temporal retinal area in 5º steps. Results: Baseline central average spherical equivalent (M) measured by subjective refraction changed from -1.95±1.27D to -0.38±0.67D. Changes in M component ranged between 1.42±0.89D at center to 0.43±0.88D at 20º in the temporal retina (p<0.002). At 25º to both sides of the central refraction measurement, peripheral refraction after treatment was not statistically different from baseline values (p>0.351). Beyond the 25º limit, M component changed in the myopic direction up to -1.11±0.88D at 35º in temporal retina (p<0.001). Treatment induced was symmetric between nasal and temporal visual field along the horizontal meridian (p>0.05 for all eccentricities). Furthermore, the degree of myopic increase in spherical equivalent for 30º (r2=0.573, p<0.001) and 35º (r2=0.645, p<0.001) eccentric refraction was highly correlated with axial spherical equivalent at baseline. Conclusions: CRT inverts the pattern of peripheral refraction in spherical equivalent refraction creating a treatment area of myopic reduction within the central 25º of visual field, and a myopic shift beyond the 25º. In peripheral refraction for 30º and 35º, the amount of myopia induced in terms of spherical equivalent has an almost 1:1 relationship with the amount of baseline spherical equivalent refraction to be corrected.
publishDate 2010
dc.date.none.fl_str_mv 2010-05
2010-05-01T00:00:00Z
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 http://hdl.handle.net/1822/11704
url http://hdl.handle.net/1822/11704
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv "Optometry and Vision Science." ISSN 1040-5488. 87:5 (Maio 2010) 323-329.
1040-5488
10.1097/OPX.0b013e3181d951f7
20375751
http://journals.lww.com/optvissci/pages/default.aspx
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 Lippincott, Williams & Wilkins
publisher.none.fl_str_mv Lippincott, Williams & Wilkins
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_ 1799132947488440320