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The primary drawback to wearing contact, especially for children, is the requirement that they be cleaned and disinfected daily in order to prevent an infection, which could result in permanent damage to the eye. Careful choice of lenses and consistent lens care will minimize the risk of infection. Wearers of best lenses are the least prone to infection but the lenses are much less comfortable, more expensive, and can pop out of the eye more easily than lenses. Daily wear lenses put the wearer at a slightly higher risk of infection because they absorb more external liquids and airborne contaminants. Planned-replacement lenses are daily wear lenses that are replaced on a regular schedule, which is usually realisticcolorssparklescontactlenses 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 for distance vision while the other corrects for near vision, may be an option for presbyopic patients. Monovision, however, may affect depth perception and may not be appropriate for everyone. contact realisticcolorssparklescontactlenses 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 realisticcolorssparklescontactlenses an eye infection does not occur. People should NEVER wear someone else''s contact. This can lead to infection or damage realisticcolorssparklescontactlenses to the eye. Aftercarelenses wearers must be examined periodically by their eye doctors to make sure that the lenses fit properly and that there is no infection. Both infection and lenses that do not fit properly can damage the cornea. Patients can be allergic to certain solutions that are used to clean or lubricate the lenses. For that reason, patients should not realisticcolorssparklescontactlenses randomly switch products unless they speak with their doctor. Another type of multifocal, a trifocal, has an area in-between that realisticcolorssparklescontactlenses corrects for intermediate distances (usually about 28 in). Conventional bifocals and trifocals realisticcolorssparklescontactlenses have visible lines between the areas of different correction; however, lenses where the correction gradually changes from one area to the other, without visible lines, have been available since the 1970s. Such lenses are realisticcolorssparklescontactlenses sometimes called progressives or no-line bifocals.To be suitable for lenses lenses, a material must be transparent, without bubbles, and have a high index of refraction. The greater the index of refraction, the thinner the lens can be. Lenses are made from either glass or plastic realisticcolorssparklescontactlenses (hard resin). The advantage of plastic is that it is lightweight and more impact resistant than glass. The advantage of glass is that it is scratch resistant and provides the clearest possible vision.
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