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 CIBA uses molds made of transparent quartz glass, which can be reused, unlike the plastic molds used for hydrogel lenses. A drop of nelfilcon A is placed onto one half of the mold, and the complementary half is suspended a few micrometers away. A circular mask is placed around the edge of the lens, and ultraviolet light is shined through the molds to cure the polymer. The mask blocks the UV light and creates a precise, smooth rim. This allows for a consistent shape with an edge half the thickness of other lenses. A thinner edge reduces what''s known as edge sensation, discomfort caused by the eyelid rubbing against the lens rim. A lens is about 14 millimeters in diameter, but only the center portion, 8 mm across, is shaped to correct vision. Typical soft Lenses have a transmissibility of 20 barrers. Lenses made with fluorosiloxane have a transmissibility of 175 barrers."The dream of a soft hydrogel that delivers sufficient oxygen has finally been realized with this material," he said. Fluorosiloxanes are currently under review by the Food and Drug Administration for sale in the United States. The materials are already available in 16 other countries as 30-day extended-wear and daily-wear lenses, which are removed every night and cleaned. Some people find it difficult to keep hydrogel lenses clean, opening up the potential for nasty eye infections. Lenses of fluorosiloxane provide less of a problem than the others because proteins don''t stick well to biomedics38 them. Wearers of most other types of soft lenses have to use enzyme solutions to remove protein deposits that the hydrogels attract. Are you in the market for some new contacts? Are you looking for quality contacts by Biomedics? Check us out. We have a comprehensive selection of contacts by all the major manufacturers including Biomedics.
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