Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/44049
Título: | Morphology, topography, and optics of the orthokeratology cornea |
Autor(es): | Ribeiro, Miguel António Faria Navarro, Rafael López-Gil, Norberto González-Méijome, José Manuel |
Palavras-chave: | Orthokeratology Corneal refractive therapy Spherical aberration Ocular aberrations Accommodation Myopia Myopia control Contrast sensitivity function Accommodative lag |
Data: | 2016 |
Editora: | Society of Photo Optical Instrumentation Engineers |
Revista: | Journal of Biomedical Optics |
Citação: | Faria-Ribeiro, M., Belsue, R. N., Lopez-Gil, N., & Gonzalez-Méijome, J. M. (2016). Morphology, topography, and optics of the orthokeratology cornea. Journal of Biomedical Optics, 21(7). doi: 10.1117/1.jbo.21.7.075011 |
Resumo(s): | The goal of this work was to objectively characterize the external morphology, topography, and optics of the cornea after orthokeratology (ortho-k). A number of 24 patients between the ages of 17 and 30 years (median ¼ 24 years) were fitted with Corneal Refractive Therapy® contact lenses to correct myopia between −2.00 and −5.00 diopters (D) (median ¼ −3.41 D). A classification algorithm was applied to conduct an automatic segmentation based on the mean local curvature. As a result, three zones (optical zone, transition zone, and peripheral zone) were delimited. Topographical analysis was provided through global and zonal fit to a general ellipsoid. Ray trace on partially customized eye models provided wave aberrations and retinal image quality. Monozone topographic description of the ortho-k cornea loses accuracy when compared with zonal description. Primary (C0 4) and secondary (C0 6) spherical aberration (SA) coefficients for a 5-mm pupil increased 3.68 and 19 times, respectively, after the treatments. The OZ area showed a strong correlation with C0 4 (r ¼ −0.49, p < 0.05) and a very strong correlation with C0 6 (r ¼ 0.78, p < 0.01). The OZ, as well as the TZ, areas did not correlate with baseline refraction. The increase in the eye’s positive SA after ortho-k is the major factor responsible for the decreased retinal optical quality of the unaccommodated eye |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/44049 |
DOI: | 10.1117/1.JBO.21.7.075011 |
ISSN: | 1083-3668 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDF - OCV - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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5.5.122. FARIA-RIBEIRO_16_JBO (Ortho-k Optics).pdf | 1,24 MB | Adobe PDF | Ver/Abrir |