ABSTRACT
Topical sunscreens act by absorbing or scattering ultraviolet (UV) radiation and are
widely available for general public use as a consumer product. Because of the deleterious
effect of visible light in some photodermatoses (1), sunscreens that offer a degree of
protection at wavelengths beyond 400 nm have been described (2,3) in this book but will
not be considered in this chapter.
