E-commerce is a major factor in the U.S. economy because it assists companies with many levels of current business transactions, as well as creating new online business opportunities that are global in nature.
Eye Health. A bifocal is a lens that has two focal points, usually one lens for viewing distant objects, and one lens for viewing close objects. A bifocal is also known as a multi-focal lens. Ben Franklin is credited as the inventor of the original bifocal lens. Presbyopia.
Bifocal contact lenses are for people suffering from presbyopia or astigmatism. Each bifocal lens must be customized to each patientâs needs. A doctorâs method of fitting can either be monovision or multifocal, and they can choose from silicone hydrogel, soft, or GP lens materials. Use a toric single vision soft contact lens on the dominant eye, and a multifocal on the non-dominant eye. 2  If only the non-dominant eye exhibits blurriness, try using a multifocal soft lens in both eyes, or try a toric, single-vision lens in the non-dominant eye.