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A few years ago, a collaborative mail effort by CIBA Vision, Novartis in Switzerland, and the Cooperative Research Centre for Eye Research and Technology in Australia developed a order new polymer called lotrafilcon A. It contains a modest 24 percent water yet allows contact six times as much oxygen lenses to pass through as the best of the HEMA hydrogels do. Lotrafilcon A consists of interspersed micrometer-size bits of two mail different plastics. One material, a hydrogel, lets water order 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.

The water carries dissolved oxygen through these contact lenses to the eye surface, says an optometrist and head of clinical affairs at CIBA Vision. "The eye needs oxygen to keep the tissue healthy." A high water content also makes soft lenses more comfortable. People blink about every 5 seconds, and a wet lens surface reduces the friction between the eyelid and the plastic. For 20 years, most of the innovations in soft lenses boosted the hydrogel''s water content. This approach has its limits, though. lenses Too much water makes the lens fragile and difficult to mail handle. Contact lens wearers become frustrated trying to slide a floppy lens from a fingertip to an eye. Moreover, even if a lens could be made of a layer of pure water, it wouldn''t get enough oxygen to the eye. Researchers decided to find new polymers that could allow order greater oxygen flow.

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