CR39 lens with high optical clarity and high abrasion resistance, yet half the weight of glass lens. CR39 material is widely used on prescription lens, as a premium optical grade lens, the price is high.
Is there any other lenses that is better?
No other lens that better than CR39 lens on handmade acetate eyewear, (Lens material range: AC,TAC, PC, Nylon, Mineral glass, CR39 lens)
Compared with mineral glasses lens, CR39 advantages as below :
Light transmittance
CR39 lens 92%
Glass lens 91%
CR39 better than Glass lens on light transmittance performance
Specific gravity
CR39 lens 1.32g/cm3
Glass lens 2.54g/cm3
CR39 half the weight of Glass lens
Drop ball testing(16g Steel ball 1.27m free-fall)
CR39 lens Not broken
Glass lens Broken
CR39 unbreakable than Glass lens
UVA&UVB protection
CR39 lens 390nm
Glass lens 290-300nm
CR39 provide 100% UVA and UVB protection, better than Glass lens
Refractive index
CR39 lens 1.502
Glass lens 1.523
The refractive index of CR39 lens equal with Glass lens
Thickness
CR39 lens 2.0mm
Glass lens 2.0mm
Atomization trend
CR39 lens better than Glass lens
Dyeing
CR39 lens Easy colored
Glass lens Not easy colored
As a professional handmade acetate eyewear manufactory, we are using optical grade CR39 lens which pass EU, AU, UNITED STATES standards.