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https://hdl.handle.net/1822/7830
Título: | The effect of lens wear on refractive index of conventional hydrogel and silicone-hydrogel contact lenses: a comparative study |
Autor(es): | Lira, Madalena Santos, Lívia Azeredo, Joana Yebra-Pimentel Vilar, Eva Oliveira, M. Elisabete |
Palavras-chave: | Refractive index Automated refractometer CLR 12-70 Silicone-hydrogel contact lenses Conventional hydrogel contact lens Equilibrium water Equilibrium water content |
Data: | Abr-2008 |
Editora: | Elsevier Ltd. |
Revista: | Contact Lens and Anterior Eye |
Citação: | Contact Lens & Anterior Eye". ISSN 1367-0484. 31:2 (Apr. 2008) 89-94. |
Resumo(s): | Purpose: The purpose of this work was to evaluate the ability of four silicone-hydrogel contact lenses (galyfilcon A, balafilcon A, lotrafilcon A and lotrafilcon B) to retain their equilibrium water content before and after wear, through measurements of refractive index and compare with that of a conventional disposable hydrogel contact lens (etafilcon A). Methods: The refractive indices of 115 contact lenses were measured using an automated refractometer (CLR 12-70, Index Instruments, Cambridge, U.K.) before and after a schedule of daily wear by 58 patients for 30 days in the case of silicone-hydrogel lenses and 15 days for the conventional contact lenses. Results: In the silicone-hydrogel contact lenses the changes on the refractive indices were not statistically significant, however after being worn the refractive index of the conventional etalfilcon A hydrogel contact lens increased significantly ( p < 0.001). Conclusion: The results presented here show that after being worn the silicone-hydrogel contact lens, show more capacity to retain or to reach their initial equilibrium water content than conventional hydrogel contact lenses. This suggests that the silicone-hydrogel contact lenses are less susceptible to spoilation over time maintaining its biocompatibility and contributing to the clinical success of lens performance. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/7830 |
DOI: | 10.1016/j.clae.2007.09.001 |
ISSN: | 1367-0484 |
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_CLAE[1].pdf | 226,92 kB | Adobe PDF | Ver/Abrir |