But UVB does make it through to some extent, at which point it’s weak enough to make it through to the epidermis. This can still cause damage but nothing near the potential amount of damage that you might experience were you to sit in direct sunlight.
On the other hand though, UVA rays are the longer wavelengths and these can pass directly through glass and still cause problems. This is the same type of light that is used in tanning beds and which is known to penetrate into the deeper levels of the skin through the epidermis and to the dermis.
Compared with UVB, UVA is actually worse when it comes to aging your skin. In fact, there are a number of pictures doing the rounds online of people who have spent their whole lives driving a truck or working in an office with a window on one side. These people look considerably older on the side exposed to sunlight through the window than on the other side!
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