<![CDATA[EC21 Product Catalogs - flat top bifocal lens]]> <![CDATA[CR-39 Flat Top Bifocal Lens]]> <![CDATA[Resin Optical Lenses]]> <![CDATA[1.56 SF Bifocal Lens]]> <![CDATA[Bifocal Lenses Are Primarily Required for Correction of Presbyopia. the Vision of Both the Far and T]]> <![CDATA[Bifocal 1.50 CR-39 Clear UC/HMC]]>