It's NOT all genetic , also behavioral: "Nearsightedness reaching epidemic levels: Half the world will need glasses by 2050 -"

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"The more time we spend focusing on something within arm's length of our faces, dubbed "near work," the greater the odds of having myopia ..

Myopia rates for Inuit went from the single digits before the 1950s to upwards of 70% by the 1970s as all children began attending schools for the first time..."

https://studyfinds.org/nearsightedness-reaching-epidemic-levels-half-the-world-will-need-glasses-by-2050/?utm_source=wnd&utm_medium=wnd&utm_campaign=syndicated