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1.56 Bifocal Flat top / Round Top / Blended HMC optical lenses
Bifocals Lenses are spectacle lenses that contain both correction zones and are primarily used for presbyopia correction. The area where bifocals correct far vision is called far vision area, and the area that corrects near vision area is called near vision area and reading area. Usually, the far area is larger, so it is also called the main slice, and the near area is smaller, called the sub slice.
