Questions tagged [light]

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-1 votes
1 answer
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Can watching lightning be dangerous for one's eyesight (assuming not directly or indirectly hit by the lightning strike)?

Watching the sun can cause eye damage. Can watching lightning be dangerous for one's eyesight (assuming not directly or indirectly hit by the lightning strike)? The only study I have found so far, {...
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6 votes
0 answers
120 views

Does light pollution affect sleep quality while already asleep?

Many articles on the internet write about melatonin and its effects, making you tired. A lot of articles also point out how the use of devices before going to bed in modern days likely decrease ...
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2 votes
1 answer
297 views

Does a computer screen work as a lightbox?

We often hear two related facts: That using a lightbox can help maintain one's circadian rhythm. That using a computer late a night can make it harder to sleep at night due to the blue light emitted ...
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1 vote
0 answers
12 views

Amount of sunlight and its effect on the eye sight [duplicate]

Are there any studies or commonly understood consensus on how the amount of light and type (different types of artificial vs. sunlight) of light that an individual is daily exposed to affects their ...
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  • 119
3 votes
0 answers
34 views

How effective are digital blue-light filters for secretion of melatonin & getting to sleep?

Programs like f.lux (Desktop Application) and features like Night Mode (iOS) claim to reduce the blue light being emitted from a digital screen to improve sleep. Is this true, and if so, how effective ...
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  • 31
4 votes
0 answers
51 views

What's important when getting an artificial sunlight lamp?

Artificial daylight lamps are frequently recommended as an intervention to improve mood in the winter months. Image from Wikipedia and is licensed under the Creative Commons Attribution-Share Alike 4....
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  • 721
0 votes
0 answers
32 views

For painting/drawing models, what is the maximum exposure time and maximum light intensity of a spot shining in your eyes at a fixed position?

For painting/drawing models, what is the maximum exposure time and maximum light intensity of a spot shining in your eyes at a fixed position? That is: before the damage to your eyes becomes ...
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  • 151
5 votes
0 answers
2k views

Infrared light therapy for menstrual pains? [closed]

My wife often has menstrual pains that knock her down for 1-2 days every month. She uses heat packs to make it bearable. I saw an infrared light on special offer earlier today and considering buying ...
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8 votes
1 answer
3k views

Light Sensitivity as a result of Caffeine Intake

Is it possible that caffeine as a psychoactive chemical could produce an effect of light sensitivity in an individual or worsen an already present condition of light sensitivity? More specifically ...
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7 votes
1 answer
79 views

Will reading in dim light damage my eyes?

People keep saying that it is important to have adequate light when reading, because reading in dim light will damage your eyes. Is this true and why?
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  • 244
10 votes
1 answer
130 views

Do light boxes effectively mimic the effects of natural sunlight to produce vitamin D?

Since moving to Seattle a few years ago, I'm wondering if I get vitamin D deficiency during the dark rainy months of the year. There are available light boxes that are used for treated seasonal ...
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