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The sun protection factor (SPF rating, introduced in 1974) is a measure of the fraction of sunburn-producing UV rays that reach the skin. For example, "SPF 15" means that 1 ⁄ 15 of the burning radiation will reach the skin, assuming sunscreen is applied evenly at a thick dosage of 2 milligrams per square centimeter [ 68 ] (mg/cm 2 ).
Ultraviolet index. The ultraviolet index, or UV index, is an international standard measurement of the strength of the sunburn -producing ultraviolet (UV) radiation at a particular place and time. It is primarily used in daily and hourly forecasts aimed at the general public. The UV index is designed as an open-ended linear scale, directly ...
Ultraviolet ( UV) light is electromagnetic radiation of wavelengths of 10–400 nanometers, shorter than that of visible light, but longer than X-rays. UV radiation is present in sunlight, and constitutes about 10% of the total electromagnetic radiation output from the Sun. It is also produced by electric arcs, Cherenkov radiation, and ...
EltaMD UV AOX Elements Broad-Spectrum can triple as sunscreen, skin care and a skin tint, which makes it a particularly smart choice for those who want an easy skin care routine that doesn't ...
Two experts we spoke with — Dr. de Moll and Dr. Magovern — recommend EltaMD UV Clear for those with oily, acne-prone skin because of its lightweight, oil-free formula that won't clog pores. It ...
However, UV index is designed to help people know when ultraviolet rays are the strongest so that they can protect themselves against sun exposure. Frequent exposure to strong UV rays can cause ...
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