SF 1.56 ,1.591PC Photo Grey, Brown Round Top, Flat Top, Invisible Bifocal Custom
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Semi Finished Lens & Blank

SF 1.56 ,1.591PC Photo Grey, Brown Round Top, Flat Top, Invisible Bifocal

These SF 1.56, 1.591 bifocal lenses combine photochromic technology with versatile bifocal designs, including round top, flat top, and invisible bifocal segments. The lenses adjust to changing light conditions, darkening outdoors and remaining clear indoors, enhancing visual comfort and reducing glare. The grey and brown photochromic options allow users to enjoy both aesthetic elegance and practical eye protection. These lenses are designed for daily wear, providing smooth near-to-distance vision transitions while keeping a stylish, professional look.

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  • Parameter
Parameter
Diameter Nominal Curve T.C. Rad Back Curve E.T. C.T. Seg Inset Seg Drop Sag Add Range Rx Range Recommended
70mm 0 0.10599 5000.47 6 14.7 7.5 0 5 0.06 +1.00~+3.50 -5.25~-8.00D
70mm 200 2.4149 219.47 6 12.3 7.5 0 5 1.43 +1.00~+3.50 -3.25~-5.00D
70mm 400 4.24747 124.78 6 10 7.5 0 5 2.49 +1.00~+3.50 +2.00~-3.00D
70mm 600 6.06407 87.4 6 8 8 0 5 3.65 +1.00~+3.50 +2.25~+4.00D
70mm 800 7.98794 66.35 6 7.2 9.4 0 5 4.89 +1.00~+3.50 +4.25~+6.00D
About
Thinkey Optical Co.,Ltd.
Thinkey Optical Co.,Ltd.
Thinkey Optical Co.,Ltd. is a custom SF 1.56 ,1.591PC Photo Grey, Brown Round Top, Flat Top, Invisible Bifocal maker and producer and quality control SF 1.56 ,1.591PC Photo Grey, Brown Round Top, Flat Top, Invisible Bifocal with over 20 years of expertise in manufacturing a wide range of optical lenses. Our facility spans 40 acres, with a production area of 20,000 square meters. Located in Duqiao Town, Linhai City—a coastal area of Zhejiang Province,Thinkey Optical employs approximately 200 workers and operates 6 advanced machines imported from Korea, as well as Satisloh RX equipment from Germany. Our daily production capacity reaches 30,000 pairs of high-quality lenses.
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