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lenses are optical devices used primarily to correct defective vision, and in some cases, for medical treatment of 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 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 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 care. a thorough understanding of tear film physiology is essential in order to understand the potential interactions between tear components and lenses.

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.

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