These lenses use the Precision Profile Design (which is also used for the monthly Air Optix Multifocal). It works by creating a smooth transition from centre near to intermediate and distance. The ADD power is consistent over the entire spherical power range which ensures a predictable fit. In addition to this, the aspheric back surface design ensures the lens fits centrally with optimal movement.
Patients like these lenses because their sight is more stable with both distance vision and near vision being equally as good, without too much compromise.