Progressive lenses are a type of multifocal lens that provide a smooth transition from near to far vision. The main types of progressive lenses in the market is common progressive glasses.
common progressive lenses are more affordable, as they are easier to produce and customize. They also have a shorter adaptation period, as they are more similar to conventional bifocal or trifocal lenses. However, common progressive lenses have more visible lines or segments, which some people may find unattractive or distracting. They also have a narrower field of view, as they increase distortion and aberration.