96% of 19-year old men in Seoul are short-sighted today. That wasn't the case 20 years ago. I mean...doesn't that seem....unlikely to you that genetics in Kor

96% of 19-year old men in Seoul are short-sighted today. That wasn't the case 20 years ago. I mean...doesn't that seem....unlikely to you that genetics in Korea changed that much in 20 years? There's a lot of pretty established research (not pop theories) about short-sightedness, which has already been referenced in this thread.