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optometrists encourage many patients to use daily disposable lenses, which are thrown away lenses after each wearing. automated manufacturing has lowered the cost of lenses enough to make this practice feasible. most longer-lasting lenses are made by clamping together plastic molds for the front and back surfaces of the lens. a thin layer of liquid polymer is squeezed into the remaining space and either cured with uv light or baked to turn it solid. then, all the excess molecules are washed away and water is added.for its daily disposable lenses, ciba vision uses a material sale called nelfilcon a, a polyvinylalcohol. the material allows the manufacturing process to be fully automated. the lenses emerge with the water already incorporated. because it takes only a few minutes to manufacture each lens, the process is efficient and a pair costs only about $1.

optometrists encourage many patients to use daily disposable lenses, which are thrown away lenses after each wearing. automated manufacturing has lowered the cost of lenses enough to make this practice feasible. most longer-lasting lenses are made by clamping together plastic molds for the front and back surfaces of the lens. a thin layer of liquid polymer is squeezed into the remaining space and either cured with uv light or baked to turn it solid. then, all the excess molecules are washed away and water is added.for its daily disposable lenses, ciba vision uses a material sale called nelfilcon a, a polyvinylalcohol. the material allows the manufacturing process to be fully automated. the lenses emerge with the water already incorporated. because it takes only a few minutes to manufacture each lens, the process is efficient and a pair costs only about $1.

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.

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