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a few years ago, a collaborative effort by ciba vision, novartis in switzerland, and the cooperative research centre for eye research and technology contact 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 lens of the hema hydrogels do. lotrafilcon a consists of interspersed micrometer-size suppliers 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.

a few years ago, a collaborative effort by ciba vision, novartis in switzerland, and the cooperative research centre for eye research and technology contact 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 lens of the hema hydrogels do. lotrafilcon a consists of interspersed micrometer-size suppliers 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.

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