There are different material that can be uses for spectacles lens.
The most common and good performance material in safety spectacle is Polycarbonate (PC)
PC material is known as impact resistant, UV protection, clear color, light weight and economic price.
Ultra violation radiation is divided into UVA (320~400nm), UVB)290-320nm) and UVC (100~290nm).
UVC are completely block by our ozone layer.
UVA and UVB can cross the ozone layer that can cause burn to our skin and eyes with extended exposure.
Just like the use of sunscreen to prevent burn on skin, the use of safety spectacles with UV protection are important to prevent burn to the eyes. Parkson Safety offer safety spectacles with UV380 treatment that can block 97% of harmful UV Rays. UV400 treatment are available to block 99.9% of harmful UV rays.