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Short answer The consensus is that sub-optimal lighting does not permanently damage the eye. Background Sub-optimal lighting can create a sensation of having difficulty in focusing. It also decreases the rate of blinking and leads to discomfort from drying. These complaints do not persist. The majority consensus in ophthalmology is that reading in dim ...


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Only two things affect the synthesis of vitamin D, and those are the amount of UVB photons penetrating the skin and the person's age. See my previous answer for an explanation and citations. So if we disregard age the only question becomes do light boxes supply adequate UVB to synthesize adequate vitamin D? From what I can tell from a review of the products ...


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I don't know if there is research on this, but if not, this might help. Natural daylight contains a wide range of light frequencies - hence the rainbow, when it's split up. At different times of day, the light has to travel through a different distance in the atmosphere, which tends to absorb some frequencies, and scatter others. This is why the sky ...


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From "Значение ретино-эпифизарной системы для психофармакологического эффекта" by Karen Ovanesov, who is co-author of one of those Russian articles on Pubmed to which you refer: (...) the visual perception is non-stationary in time and changes during the day. The use of stimulants of mental processes, such as caffeine can not only enhance the ...


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