It is about 20 hours of outside play a week, more or less, from early childhood, through tweens, teens, and into college. When you mean you did, most of your young life, was it about that much?

The second thing I would ask is if you have astigmatism or myopia. They are not the same thing.

The third thing is that the Taiwanese protocol included an early childhood intervention for a portion of the population. They have a test and an additional treatment. I don’t remember the details. If you have myopia instead of astigmatism, you might be one of those kids.

Lastly, there are still some kids who develop myopia anyways in Taiwan after establishing this program.

At what time? Where? How much?

Did you play an hour a day during solar noon?

(It would actually be cool to see if myopia rates change along towns near a time zone border -> kids getting out of school during the brighter time of the day)

Did you read recreationally as a child? I did not read books until I was 13. Not one before 12—-mild dyslexia. Emmetropic though to my 70s. My kids were both heavy readers almost as toddlers, as was my wife. All are 8 diopters myopic. Saved by dyslexia ;-)