UVB, a mid-range wavelength, is thought to contribute
mostly to the development of skin cancer, although it has been
shown to play a role in aging and other skin damage. UVC
is the shortest wavelength that does not usually penetrate the
atmosphere. However, UVC can also play a role in mutagenesis
by imparting DNA damage. In many cases, the visible signs of
skin aging, such as wrinkling, dryness, and discoloration, are
caused by or exacerbated by UV exposure