Questions tagged [uv-rays]

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Does any drug/cream help prevent DNA damage post UV exposure?

I read on https://medicine.yale.edu/news-article/sun-damage-occurs-even-after-sunset/: When UV light hits the skin , it causes a type of DNA damage known as a cyclobutanepyrimidinedimer (CPD) , in ...
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28 views

To what extent do UV-A, UV-B and UV-C exposure account for visible signs of aging in the skin? I'm looking for a breakdown between UV-A, UV-B and UV-C

Several studies indicate that UV exposure account for between 80% to 90% of visible signs of aging in the skin. E.g., from {1}: UV exposure may account for up to 80% of visible signs of aging in the ...
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1answer
49 views

Why do most of an average person's UV exposure from the sun occur before the age of 18?

I read on https://www.epa.gov/radtown/ultraviolet-uv-radiation-and-sun-exposure: Most of an average person's UV exposure from the sun occurs before the age of 18. Why do most of an average person's ...
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Beyond melanogenesis, what mechanisms does the human body have for acquired tolerance to UV-B exposure?

I've been studying narrow-band UV-B phototherapy used for treatment of psoriasis and eczema. Generally, the administering physician will begin at a low enough UV dose to avoid burning, and gradually ...
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1answer
105 views

Does the damage from sun exposure outweigh the benefit of getting vitamin D?

I have read some articles where they recommend a direct exposure to the sun of about 20 to 30 minutes, others say that 10 to 15 minutes, another that 5 minutes is enough, etc. I suppose it depends on ...
6
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1answer
86 views

Is it advisable to wear UV protected swimsuit that covers arms and legs for skin protection to an outdoor swimming pool?

Is it advisable to wear UV-protected swimsuit that covers arms and legs for skin protection to ward off skin cancer? Or is it too paranoid, given that most men and women wear swimming trunks / ...
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2answers
7k views

Do we produce Vitamin D in the shade?

Do our bodies produce Vitamin D in the shade? If so, what is the percentage decrease in the amount of Vitamin D produced compared to full exposure to sunlight? For example, sitting outside in the ...
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1answer
49 views

Which studies have shown that UV radiations fail to reach some part on the mask and therefore may not be suitable for sanitizing masks?

I read on https://www.20minutes.fr/sante/2749451-20200328-coronavirus-traiter-masques-ffp2-reutiliser-possibilites-actuelles-limitees (mirror): Plusieurs procédés ont déjà fait l’objet de tests, ...
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50 views

What is the proper type of UV rays for COVID-19 sterilization?

I have seen this device which is used for medical sterilization: I like to know proper type of UV light for Covid-19, and seen this posts: UV light covers a wavelength spectrum from 100 to 380 nm ...
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0answers
37 views

Does wearing UV blocking glasses worsen myopia in children?

I have found this article which claims (for chicken) that blocking outdoors UV light made myopia worse. Some kids require glasses from a young age, e.g. 6 years old. Most of these glasses do have UV ...
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2answers
2k views

Do UV-B emitting lamps for reptile pets produce vitamin-D in human skin?

There are those lamps like e.g. "ReptiGlow" for pet reptilians, to keep them healthy, the output being graded e.g. by habitat: jungle (trees somewhat reduce the UV that hits the animals), or desert (...
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25 views

What UV intensity (watts per area) should be the maximum a light-skinned person should be exposed to?

I have a UV AB meter that can measure UV A and B light intensity in microWatts/(centimeters squared). In direct afternoon sunlight, I measure UV AB at about 3000 microWatts/cm^2. In the shade of the ...
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0answers
52 views

Why do you not need sun protection whe the UV index is 3?

In Australia, they recommend sun protection when the UV index is above 3. Why is this? Surely whenever it's above 0 there are still UV rays hitting your skin? Would 10 minutes in the sun with a UV ...
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0answers
32 views

Do bearded faces age slower?

Recent research indicates that UV exposure may be responsible for around 80% of facial skin aging symptoms. The more unprotected exposure from the sun, the more the skin ages. Does the evidence show ...
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0answers
14 views

Calculating sun exposure limit over changing UV index

I'm currently working on an engineering project which monitors the users current UV exposure and attempts to calculate how much time they can safely remain in the sun. An issue I've encountered is ...
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0answers
42 views

Are cheap sunglasses dangerous?

Does having any plastic between your eyes and the environment automatically provide UVA and UVB protection? Or do the lenses actually have to be coated (or be comprised of a special type of plastic) ...
2
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1answer
38 views

Safe UV exposure time

How long can our body be exposed to UV to not cause health problems like skin cancer, etc,. In some parts of the USA, the UV index can reach High (7-9). I'm trying to understand if I need to stay ...
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1answer
57 views

Reddened in the face / red skin in the face [closed]

i have red skin in my face since a couple months. I thought it is coming from drinking because I spent like 3 weeks drinking every second day with a friend who visited me and afterwards I got problems ...
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0answers
83 views

Test UV protection on sunglasses

I bought sunglasses in China that claims to have UV400 protection. I'd like to test this as my eyes' health is on the line :) Is there any way to check the maximum UV amount these glasses can protect ...
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0answers
17 views

Which kind for filter to protect eyes from LED's blue light : UV(A), UV(B) or UV(C)?

I heard about the so called "retinal light toxicity" that the blue light from LED lighting may cause. I would like to mount a filter on the objective of my microscope to reduce the risk of injuries, ...
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22 views

Relationship between UPF/SPF and reduction in UV damage

I'm trying to untangle the relationship between the UPF/SPF rating of clothing or sunscreen and its effectiveness at reducing health risks from exposure to sunlight. The first complication is that a ...
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0answers
17 views

How good are snow goggles for UV protection?

Snow goggles are sometimes used to protect against photokeratitis (a.k.a. snow blindness). How good are snow goggles for UV protection? E.g., do they block 99 to 100 percent of both UVA and UVB rays, ...