· 5 min read · 7 sources
Is light therapy safe if you have or have had cancer?
The worry comes almost entirely from cell cultures. The reassurance comes from patients. What the clinical evidence says, and the question nobody asked.
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Lamps, glasses, daylight, air and noise. What the equipment promises, and what has been measured in people.
9 analyses
· 5 min read · 10 sources
Red light and your brain: a search of 81 studies
Several meta-analyses say red light on your head helps memory, and there is now a home-device trial. What was measured, and where the evidence is thin.
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· 6 min read · 12 sources
Is red light bad for your eyes? A 488-study search
Thousands of children have had red light shone straight into their eyes for myopia. What those trials showed about safety, and where harm did happen.
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· 5 min read · 11 sources
Does red light work for pain? Why 412 reviews disagree
There are 412 systematic reviews on light and pain, and they do not agree. What the full texts say that the abstracts leave out, condition by condition.
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· 4 min read · 6 sources
Does red light help wounds heal? It depends on the wound
In diabetic foot ulcers red light nearly doubles the chance of healing. In venous leg ulcers it does nothing. Wound healing is not one outcome.
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· 9 min read · 64 sources
Red and near-infrared light: a 2,225-study search
Red and near-infrared light across skin, pain, cognition, mood and eye safety, with a transparent count of how many studies were actually verified.
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· 7 min read · 10 sources
What does blue light do to your circadian rhythm?
Blue light suppresses melatonin and shifts your body clock. But intensity and timing weigh more than colour, and people differ more than lamps do.
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· 9 min read · 13 sources
Do blue light glasses help with tired eyes?
One trial found the relief wearers report. Another swapped the lens for an equally dark grey one, and the benefit disappeared. What is left that works.
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· 9 min read · 12 sources
Do blue light glasses help you sleep? 31 trials read
Cochrane found no trial free of bias risk. The gap between what people feel and what the equipment records explains almost everything.
Read articleStill to be written
Daylight & sun · Air, noise & green
Guides
Light & circadian
Environment & toxins
Air, noise and green
Air, noise and green space: the three exposures that act on you every day whether you think about them or not, and what the largest studies found.
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