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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 discount 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 lenses 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 discount 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 lenses 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.

soft lenses. soft lenses have become the most popular among all the types of lenses. they contain hydroxyl or hydroxyl and lactam groups, which allow them to absorb and hold water. a majority of soft lenses discount are composed of 2-hydroxyethylmethacrylate (he ma) with small amounts of cross-linking agents that provide a hydrogel network. the extent of cross-linking determines the hydrophilicity of the lens; any increase in the extent of cross-linking results in a decrease in availability of hydrophilic groups for interaction with water, causing the lens to be less flexible and less hydrated. hydrophilic lenses tend to accumulate more protein deposits than hydrophobic lenses. daily-wear contacts need to be removed before the wearer goes to sleep at night, while the extended-wear contacts may be worn more than a day, with some having been approved for continuous use for up to a month.

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