A type of physical sunscreen sunscreen protects the skin from harmful uva. By UV radiation energy source to UV radiation can penetrate through the skin to damage the skin.
As a physical sunscreen kind of sunscreen to protect phiochakrangsi uva by distributing UV radiation, the energy that comes with a UV cannot infiltrate across the skin cells into the damaged skin layers.
As a matter of physical, sunglasses, sunscreen helps protect your skin from uva rays, UV rays, the distribution of energy, and the UV rays can not infiltrate through skin cells to destroy skin.