Index=1.49
Abb NO.=57.4
Kow Weight
Lens Of The Pmma Have Density Of 1.19/cm³,Almost Half Of That Of Standard Crown
Low Cost
Popular,The Lens Is Popular For Sunglasses

Polycarbonate

Rough
IndexIs High,ne=1.591.nd=1.586
The Lower Weight.The Lens Of The Polycarbonate Have Density Of
1.2g/cm³.100%Protection(385nm)
Enduring High Temperature ,(140° C/280° f)
The Lens Of The Polycarbonate Is Comfortable For Multi-coating And Other Coating
Add NO.Ve=31,vd=30,It Is Good For Eyewearer