disposible contacts

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A few years ago, a collaborative effort by CIBA Vision, Novartis in Switzerland, and the Cooperative Research Centre for disposible Eye Research and Technology in Australia developed a new polymer 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 bits of two different plastics. One material, a hydrogel, lets water and ions reach the eye surface; the other, called fluorosiloxane, channels oxygen. 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. 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 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 them. Wearers of most other types of soft lenses have to use enzyme solutions to remove protein deposits that the hydrogels attract.

In the early days contacts of hard Lenses, many wearers found themselves uttering this alarm, disposible then dropping to their hands and knees to search for the wayward contacts piece of plastic. Of course, the lens always seemed to get lost in a room with wall-to-wall shag carpeting and guests parading about in high heels. Nowadays, the command for a whole room to freeze is hardly ever heard. The advent of soft Lenses, which cling to the eye''s surface, made this scenario less and less likely. The flexibility of soft lenses also made them easier to get used to and more comfortable to wear. New and anticipated improvements in lens materials promise to further increase the comfort and safety of contacts. Other innovations in lens design and materials could make Lenses available to a wider range of people with less-than-perfect vision.

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.