1.Diamaeter: 50/55/60/65/70/75mm 2.Slim and thin. 3.High scratch resistance 4.UC, HC and ... HMC 5.Semi-fimished is availabl 1) Flat-top2) Finished lens:a) Diameter: 28/70mmb) Power range:i) Spherical: 0.00 ... ~ ±3.00ii) Add: +1.00 ~ +3.003) Semi-finished lens:a) Diameter: 28/70mmb) Base: 200, 400, 600, 800c) Add ... your logo,need extra charges CR-39 bifocal D-28 lens