A contact is a thin, curved lens that sits on top of the film of a person’s eye, resting on a layer of tears. Contact or optical lenses improve an individual's vision. Lenses are basically clear, except for a light tint that enables wearers to see the lenses while inserting and removing them. Lenses are made of both hard and soft materials, but soft lenses are substantially more popular.
Contact lens are most often used for vision correction, however lenses are also available that allow individuals to chance the look of their eye color, purely for aesthetics. All contact lenses are regulated by the Food and Drug Administration and require a prescription. Contacts can be made from different materials including:
Even with proper care, contact lenses must be replaced frequently to prevent the build-up of deposits and minimize the risk of contamination. Soft lenses are offered in different versions, according to the duration of time they can safely be worn. These include:
Gas permeable lenses, or lenses which allow more oxygen through them, can last a lot longer because they are not as susceptible to deposit accumulation. GP lenses can last 12 months or occasionally longer.
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