Not only is the Purevision Multi-Focal a lens that corrects multiple eye problems at the same time as all multifocals do, it also incorporates the latest developments in contact lenses by offering 30 days of continuous wear, which is very rare even for traditional contact lenses. They are built in a way that you can leave them in your eyes for up to a month, and still you will nearly feel like you’ve put them in the day before. As many proteins and lipids build up on traditional lenses when worn for an extended period of time, it is really something of a marvel that these lenses can clean themselves so that you don’t have to worry about inflammation or infections.