Contact Lenses
Balafilcon A is a silicone hydrogel used basically in the industry of lenses. Bausch&Lomb the world famous manufacturer of lenses, produces a line of contact lenses - PureVision - made of Balafilcon, with 36% of water, which adapt better to correct human vision problems such as Presbyopia and Myopia.
In a basic level, the lenses are put over the surface of the cornea and redirect the rays of light to focus appropriately into the retina of the eye. That is same principle applied to the conventional lenses to help correct the refractive defects, among others.
When there is more than one vision defect, the problem is solved by the use of bifocal or multifocal lenses, which correct more than one problem with the same glasses.
The use of contact lenses has become an increasing practice since the last decades, even the cosmetic uses of such lenses have become more and more frequent. Though the continuous use of contact lenses is not precisely recommended by the physicians, due to a high level of risk associated specially with the overnight use of contact lenses.
The practical recommendation is that the use of contact lenses should be made AFTER a visit to the physician, to avoid the risk of infection or inflammation.
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