... 3.round top,flat top are available Bifocal lensSemi-Finished lensTechnical data:1.Material:CR-392.Abble Value: ... protection -option HEMW(ITO)Coated specifications of 1.499 Semi-Finished lens single-vision65mm/70mm,50base-1000baseSpecifications of 1.499S ... F blended,S/Flat top28/70mm,200base-800basespecifications of semi-finished progressive lens75mm,200base-800base different style with different price ...