> most people lose their eyesight from ages 7 - 10, and i don't think many people in the 1800s and before experienced this. i imagine eyesight blurriness was very rare. read the eskimo study. a village had basically perfect vision and then the next generation it fell to roughly 50% myopic due to the introduction of western style schooling. it's not the type of man-made light, it's the fact that people are inside so much now and not kids playing outside and thus focusing on things far away while outside + not getting super fuck you bright sunlight that no normal light incandescent or led emulates. lumens not wavelength. bonus info for you, different study mind you, they put glasses on a chicken and conclusively proved that (newer styled) glasses elongate the eyeball and worsen vision.
United States