Back in the glorious 50s, I got to second grade before someone figured out that I was doing so poorly because I couldn’t see the blackboard. My vision was measured at 20-400, and I had bifocals from age 7. I vividly remember the day I got my first glasses. It was like I had gone to another world.
My myopia was blamed (by my M.D. Dad) on my Mom having dosed me with too many vitamins. Vitamin D garnered special opprobrium. My brother and sister didn’t have any vision problems of note.
I didn’t read anything about vitamins in your revisited classic; has there been any actual, scientific, research done on this?