Multifocal progressive lenses are a type of lens that is composed of multiple focal points and different degrees. They are generally divided into three areas: far-sighted area, intermediate area and near-sighted area. Each area meets different vision requirements. The upper part of the lens is used for far-sightedness and the lower part is used for near-sightedness. However, unlike bifocal lenses, the middle part of progressive lenses has a transition zone, which allows for an adaptation process from far to near visual distance.