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Qualitative and quantitative characterization of the in vitro dehydration proce...
González-Méijome, José Manuel; López-Alemany, António; Parafita, Manuel A.; Almeida, José B.; Refojo, Miguel F.PURPOSE: To investigate the in vitro dehydration process of conventional hydrogel and silicone-hydrogel contact lens materials. METHODS: Eight conventional hydrogel and five silicone-hydrogel contact lenses were dehydrated under controlled environmental conditions on an analytical balance. Data were taken at 1-min intervals and dehydration curves of cumulative dehydration (CD), valid dehydration (VD), and dehyd...
Oxygen transmissibility of piggyback systems with conventional soft and silicon...
López-Alemany, António; González-Méijome, José Manuel; Almeida, José B.; Parafita, Manuel A.; Refojo, Miguel F.To investigate the apparent oxygen transmissibility of various piggyback systems using conventional and silicone hydrogel soft contact lenses of different water content and permeability, rigid poly(methyl methacrylate), and rigid gas-permeable lenses of medium, high, and ultrahigh oxygen permeability. The aim of the study was to establish which material (rigid or hydrogel) is more representative of the resultin...
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