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Emil O. W. Kirkegaard's avatar

"This surprised me - the conclusion is that most of the connection between myopia and intelligence is explained by genes and not environment (i.e. reading)."

That's because you incorrectly assume that variation in reading habits has non-genetic causes. A genetic correlation between two such things might simply result from a shared cause from equally genetic basis with interest in reading or something. In real life, things are more complicated, but you get the idea.

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Roger’s Bacon's avatar

Thank you for this - editing to add a reference to your comment down here.

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