Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/8255
Título: | Comparative study of silicone-hydrogel contact lenses Surfaces before and after wear using atomic force microscopy |
Autor(es): | Lira, Madalena Santos, Lívia Azeredo, Joana Yebra-Pimentel Vilar, Eva Oliveira, M. Elisabete |
Palavras-chave: | Atomic force microscopy Contact lens Degradation Polymer Surface analysis |
Data: | Mai-2008 |
Editora: | John Wiley and Sons |
Revista: | Journal of Biomedical Materials Research - Part B: Applied Biomaterials |
Citação: | "Journal of Biomedical Materials Research Part B : Applied Biomaterials". ISSN 1552-4973. 85B:2 (May 2008) 361-367. |
Resumo(s): | Purpose: The aim of this study was to analyze surface changes of three silicone-hydrogel contact lenses after daily wear. The lenses used in this study were balafilcon A, lotrafilcon B (both surface-treated), and galyfilcon A (non surface-treated). Methods: To understand how and where proteins, lipids, and other contaminants change contact lenses, surface roughness was assessed through Atomic Force Microscopy Tapping ModeTM. Roughness parameters were Mean Surface roughness (Ra), Mean-square-roughness (Rq), and Maximum roughness (Rmax). The surface topography of unworn and worn lenses was also mapped in great detail. Results: Contact lenses roughness parameters exhibited different values before and after wear and the surface appearance also changed. After wear, balafilcon A and galyfilcon A showed a significant increase on surface roughness parameters, being this increase more accentuated to galyfilcon A. In lotrafilcon B materials no significant changes were observed with wear. Conclusions: The present study suggests that surface treatment of silicone-hydrogel contact lenses can play a role in the prevention of a significant increase in roughness, and contribute to the better clinical tolerance of these lenses. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/8255 |
DOI: | 10.1002/jbm.b.30954 |
ISSN: | 1552-4973 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Lira_JBMR[1].pdf | 407,73 kB | Adobe PDF | Ver/Abrir |