PureVision are monthly lenses from the manufacturer Bausch & Lomb. They are made of the newly developed silicone hydrogel Balafilcon A, which, due to its low water content of only 36%, draws much less moisture from the eye than lenses with a higher water content. Drying out of the eyes is thus effectively prevented. The combination of silicone and hydrogel results in high wearing comfort, especially for people with dry eyes. Usually, the drying out of the eyes is favored by a long wearing time and, for example, is intensified in air-conditioned environments with low humidity. The special composition of the material Balafilcon A prevents dry eyes and allows comfortable wearing even for long periods. PureVision lenses are characterized by high oxygen permeability. The eye is supplied with a natural oxygen content and the fluid transport in the eye is hardly affected by wearing the lens. A special surface treatment makes the lenses insensitive to dirt and deposits. Unlike a coating, which can wear off over time, the PureVision material itself has been treated with a special process. The outstanding surface properties of the lens are thus retained throughout the entire wearing period. The result is a unique quality of vision with high wearing comfort and naturally healthy eyes. Contact lenses from PureVision are designed for a period of use of up to 30 days.