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  2. Health effects of sunlight exposure - Wikipedia

    en.wikipedia.org/wiki/Health_effects_of_sunlight...

    Exposure of skin to ultraviolet radiation from sunlight presents both positive and negative health effects. On the positive side, UV exposure enables the synthesis of vitamin D3, which is essential for bone health [1] and potentially plays a role in inhibiting certain cancers. [2][3] While vitamin D can also be obtained through dietary ...

  3. Ultraviolet - Wikipedia

    en.wikipedia.org/wiki/Ultraviolet

    Arc welders must wear eye protection and cover their skin to prevent photokeratitis and serious sunburn. 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 ...

  4. Ultraviolet index - Wikipedia

    en.wikipedia.org/wiki/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 proportional to the ...

  5. What To Know about Solar Purpura

    www.aol.com/know-solar-purpura-110000835.html

    Solar purpura causes flat and purple or red bruises on the skin, while acne usually looks like small red, pink, white, or black bumps on the skin, depending on your acne type. Acne also usually ...

  6. Sunburn - Wikipedia

    en.wikipedia.org/wiki/Sunburn

    Sunburn is a form of radiation burn that affects living tissue, such as skin, that results from an overexposure to ultraviolet (UV) radiation, usually from the Sun. Common symptoms in humans and other animals include red or reddish skin that is hot to the touch or painful, general fatigue, and mild dizziness.

  7. Light therapy - Wikipedia

    en.wikipedia.org/wiki/Light_therapy

    Light therapy for skin conditions like psoriasis usually use 313 nanometer UVB though it may use UVA (315–400 nm wavelength) or a broader spectrum UVB (280–315 nm wavelength). UVA combined with psoralen, a drug taken orally, is known as PUVA treatment. In UVB phototherapy the exposure time is very short, seconds to minutes depending on ...

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