The so called multifocal contact lens designs work similar to progressive eyeglass lenses, where the different prescriptive powers are blended across the lens. But it is absolutely different from eyeglassess, aspheric contact lenses are simultaneous vision lenses, so a proper prescription must be selected by your visual systerm for the moment.The only type of multifocal contact lenses is progressive lenses(no-line-bifocal lenses).Thanks!

Why are aspheric lenses better than spheric lenses?That depends on the basic principle they work.Conventional lenses for nearsightedness do just the opposite: They make things look smaller and give the wearer's eyes a small, "beady-eyed" appearance.Aspheric lenses greatly reduce these undesired magnification and minification effects, so the world
looks more natural to the wearer, and the wearer's eyes look more natural to everyone else.