4 ms·
Not buying the sunlight argument, equatorial countries are hardly afflicted by vitamin D deficiencies or seasonal affective disorder you see in Europe. Solar in
by Rastonbury 4y ago
Not buying the sunlight argument, equatorial countries are hardly afflicted by vitamin D deficiencies or seasonal affective disorder you see in Europe. Solar intensity is stronger year round than summer in some Scandinavian countries. If it were sun, we'd see similar patterns in myopia to vit D deficiency as you get closer to the poles.
- djtango 4y agoThis is def a decent counterpoint - on a previous HN thread on this topic I recall studies being done on agricultural vs urban mainland chinese people and how a refinement to the observation so sunlight/outdoors might be a proxy for some other factor. I've seen proposed "distant viewing". Although one possible nuance is that sunlight to the eyes != sunlight to the skin. In cold climates you wear thick clothes which will block out sunlight to the skin (vit D deficiency) but you may still get plenty of UV to the eyes. Throw in some mountains for distant gazing and suddenly nations that love skiing could be simultaneously vit D deficient but guarded against myopia. Pure conjecture of course - IANA(Biologist/Opthamologist/Doctor)