Closely related to my ramblings on the old Islamic insistence on using alidades instead of lenses to observe the universe. Stay as close as you can to the source, don’t distort vision with lenses, don’t distort science with theories, don’t distort business with abstract debt and stocks.
RemnantMD on Substack discusses how light controls much more than just the pupils.
Everyone knows that our pupils contract when our eyes are exposed to bright light.
Everyone doesn’t know, and I certainly didn’t know, that the brain center controlling the pupil ALSO controls melanin production in the skin. When the pupil contracts, the body gets ready to receive some nice warm sun and make some nice Vitamin D.
Wearing sunglasses, or using tinted windows, reduces the input brightness and thus reduces the melanin production. People who wear sunglasses get more sunburns because they’re blocking the skin’s natural responses!
Polistra's Mill 