Why are you wearing sunglasses?
https://blossom.primal.net/929a39aacea602223637ec8fe4976169b36c7a24c0be761b3a6ebc8dfffc5c4e.mov
It's illogical to suggest wearing a hat, instead of sunglasses, if the goal is increasing the amount of direct sunlight hitting the retina.
A hat still blocks most of it, but it also puts the skin in the shade, reducing the amount of Vitamin D absorbed. Vitamin D deficiency is a chronic illness among Europeans.
You get vitamin D from butter, mushrooms, blubber from marine mammals etc.
No the point is not to get sunlight directly in your eyes that will make you blind.
The hat blocks the direct sunlight so you're only getting the reflected sunlight.
And your chest and back are the parts that are able to absorb the most vitamin D from the sun.
Your scalp does not need to be exposed to the sun to absorb vitamin D
Ah, you don't live in northern Europe.
of course you need to be moderate with it but proper bright sunlight (indirect, from pavement and surrounds) triggers endocrine processes. it's a very good idea to get out first thing in the morning after dawn and walk around for 15 minutes with no glasses on. but other than that, yeah. if it's that sunny, wear a singlet. if it's even sunnier than that, wear a hat and blue or white clothes.
it is good to get natural light in the eyes, for your glands, especially the pineal gland, which governs the day/night cycle. UV is part of that, the A and B spectra are not harmful to the eyes like C.
i have sunglasses but they are IR blockers and i'd wear them specifically in cities with cameras everywhere.
sometimes it really is that sunny you need to wear a hat but that's certainly not true of my locality, over on the other side of the island, maybe on hotter summer days a hat would make sense.
also consider where this video is shot - the sunlight is bouncing straight off all that concrete, so with a hat on, he's gonna still get a lot of exposure.
but yeah, definitely in european, hot summertime, don't wear a hat or sunglasses. unless you work outside all day long. and if you work outside all day long, wear a hat, not sunglasses.
note also that most reading and driving glasses also block UV, and so does the soda glass used in the windows of cars and houses. UV is the main important thing, specifically UVA and UVB. a small amount of UVC is ok but it induces oxidation vigorously, it is used in biology labs of various kinds as part of sterile procedure for things like transferring material from a petri dish into something else, in addition to peroxide and alcohol cleaning, fancy glove-boxes use UVC lamps, usually they are mercury lamps (UV also causes phosphors to glow so all fluorescent lamps MUST have mercury to create sufficient UVC spectra.
