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lenses are optical devices used primarily to correct defective vision, and in some cases, for medical treatment of contacts certain corneal diseases. the use of lenses has steadily increased over the years; with their increased popularity, many different kinds of lenses have been developed, all of which require patient education regarding the products available for proper use and maintenance. the aim of this article is to present a concise summary of various products available for lenses, pharmaceutical care for patients wearing lenses, potential drug-lens interactions, and guidelines for effective performance of lenses and products for their cosmetic contacts care. a thorough understanding of tear film physiology is essential in order to understand the potential interactions between tear components and lenses.

lenses are optical devices used primarily to correct defective vision, and in some cases, for medical treatment of contacts certain corneal diseases. the use of lenses has steadily increased over the years; with their increased popularity, many different kinds of lenses have been developed, all of which require patient education regarding the products available for proper use and maintenance. the aim of this article is to present a concise summary of various products available for lenses, pharmaceutical care for patients wearing lenses, potential drug-lens interactions, and guidelines for effective performance of lenses and products for their cosmetic contacts care. a thorough understanding of tear film physiology is essential in order to understand the potential interactions between tear components and lenses.

a few years ago, a collaborative effort by ciba vision, contacts novartis in switzerland, and the cooperative cosmetic research centre for 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 contacts 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.

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