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optometrists encourage many patients to use daily disposable lenses, which are thrown away after each wearing. automated manufacturing has lowered the cost of lenses enough to make this practice feasible. comparison most longer-lasting lenses are made by clamping contact 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. lens then, all the excess molecules are washed away and water is added.for its daily disposable lenses, ciba vision uses a material 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 comparison and a pair costs only about $1.

optometrists encourage many patients to use daily disposable lenses, which are thrown away after each wearing. automated manufacturing has lowered the cost of lenses enough to make this practice feasible. comparison most longer-lasting lenses are made by clamping contact 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. lens then, all the excess molecules are washed away and water is added.for its daily disposable lenses, ciba vision uses a material 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 comparison and a pair costs only about $1.

in the early days of hard lenses, many wearers found themselves uttering this alarm, then dropping to their hands and knees to search for the wayward piece of plastic. of course, the lens always seemed to get lost in a room with wall-to-wall shag carpeting contact and guests parading about in high heels. nowadays, the command for lens a whole comparison room to freeze is hardly ever heard. the advent of soft lenses, which cling to the eye''s surface, made this scenario less and less likely. the flexibility of soft contact lenses also made them easier to get used to and more comfortable to wear. new and anticipated improvements in lens materials promise to further increase the comfort and safety of contacts. other innovations in lens design and materials could make lenses available to a wider range of people with less-than-perfect vision.

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