the primary drawback to wearing contact, especially theatrical 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.

the primary drawback to wearing contact, especially theatrical 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.

another type of multifocal, a trifocal, has an area in-between that corrects radioactive for intermediate distances (usually about 28 in). conventional bifocals and trifocals contacts 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 sfx been available since the 1970s. such lenses are 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 (hard resin). the advantage of plastic is that it is lightweight and more impact theatrical resistant than glass. the advantage of glass is that it is scratch resistant and provides the clearest possible vision.