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 A few years ago, a collaborative effort by CIBA Vision, Novartis in Switzerland, and the biomedics Cooperative Research Centre for Eye Research and Technology in Australia 38 developed a new polymer contact called lotrafilcon A. It contains a modest 24 percent water yet allows six times as much oxygen to pass through as the best of the HEMA hydrogels do. Lotrafilcon A consists of interspersed micrometer-size lenses bits of two different plastics. One material, a hydrogel, lets water and ions reach the eye surface; the other, called fluorosiloxane, channels oxygen. biomedics The combination is as transparent as a conventional contact lens. The ability of a material to convey oxygen relative to its thickness is called transmissibility. 38 Lenses should have a transmissibility of at least 90 barrers for oxygen, according to researchers at the University of California, Berkeley and Indiana University in Bloomington. Typical soft contact Lenses have a transmissibility of 20 barrers. Lenses made with fluorosiloxane lenses have a transmissibility of 175 barrers."The dream of a soft hydrogel that delivers biomedics 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 38 less of a problem than contact the others because proteins don''t stick well to them. Wearers of most other types of soft lenses have to use lenses 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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