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Planned-replacement lenses are daily wear ocular lenses that are replaced on a regular schedule, which is usually every two weeks, monthly, or quarterly. They must also be cleaned. Soft contact come in a variety of materials. There are also different kinds of RGP and soft multifocal contact available. Monovision, where one lenses corrects health for distance vision while the other corrects for near vision, may be an option for presbyopic patients. contacts Monovision, however, may affect depth perception and may not be appropriate for everyone. contact also come in a variety of tints. corrective are available that can change dark-colored eyes a different color. Even though such lenses have no prescription, they must still be fitted and checked to make sure that an eye infection does not occur. People should NEVER wear someone else''s contact. This ocular can lead to infection or damage to the eye. health Aftercarelenses wearers must be examined periodically by their eye doctors to make sure that the lenses fit properly and contacts that ocular there is no infection. health Both infection and lenses that do not fit properly can damage the cornea. Patients contacts can be allergic to certain solutions that are used to clean or lubricate the lenses. ocular For that reason, patients should not randomly switch products unless they speak with their doctor. contact The concept of corrective lenses that sit directly on the eyeball was developed in the ninth century, but it was not until health and contacts the late 20th century that manufacturing and grinding techniques for contact were perfected. ocular Originally contact were made of glass, then later of hard plastic, and still later of flexible, highly oxygen-permeable soft plastic. Today, the majority of lenses worn are of two basic health types: rigid gas permeable (so-called "hard" lenses) and lenses. best lenses are smaller and more durable, but require a longer period of adjustment for the wearer. Hard contact can correct some vision problems, like astigmatism, that the lenses cannot. The lenses are slightly contacts larger than best lenses. They are more comfortable and less expensive, but can be easily torn. The latest generations of contact are extended and disposable lenses. extended lenses are intended to be worn for several weeks at a time, while disposable lenses are thrown away every day or every few weeks, or ocular in the newest versions, every day. Preschool health and school-age childrencontact are a significant improvement over lenseses for children and adolescents who participate in sports or outdoor activities.contact are recommended contacts for most athletes who need corrective eyewear. Often, a single pair of lenses is less expensive than the combined cost of glasses and prescription goggles. Swimmers especially can benefit from being able to see underwater while wearing regular goggles over their contact. Because contact tend to dry the eye, swimmers and all athletes should take care to blink several times before and after an activity session in order to assure natural cleansing. If any pool water enters a swimmer''s eyes, the lenses should be thoroughly disinfected as soon ocular as possible to remove pool contaminants. Children who like spending time looking health into contacts a telescope, microscope, or binoculars may also prefer contacts over lenseses.
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