Risks
Knowledge Base articles tagged Risks.
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The dangers of UVA radiation
UVA's health effects: photoaging and wrinkles, indirect DNA damage via reactive oxygen species, skin-cancer and melanoma risk, eye damage, immune suppression and photosensitivity — plus practical ways to cut exposure.
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Does glass block UVA? Windows, cars and UV film
Ordinary window glass stops almost all UVB but lets a large share of UVA through. How much passes through home, office and car glass, why windshields differ from side windows, what the driver skin-cancer studies show, and how to choose UV film.
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UVA indoors: nail lamps, tanning beds and what your lights really emit
Gel-manicure lamps are almost pure UVA, tanning beds emit heavily UVA-shifted spectra, and screens emit no UV at all. What each indoor source actually puts out, how it compares to midday sun in W/m², and where the real risks are.
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UVA, melanin and pigmentation: melasma, hyperpigmentation and skin tone
UVA and visible light drive melasma and post-inflammatory hyperpigmentation far more than UVB — which is why tinted, iron-oxide sunscreens outperform clear ones. What melanin does and doesn't protect against, across Fitzpatrick types.
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Photosensitivity: medications and conditions that make UVA dangerous
Most drug photosensitivity is UVA-driven, which is why it happens through car and office windows and on overcast days. Phototoxic vs photoallergic reactions, the main drug classes, PMLE, lupus and porphyria, and what protection actually works.
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