Q&A with Harpending and Cochran
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If the genetic explanation is true and environment makes no contribution, then I think one should find that IQ is more highly correlated with myopia than academic achievement
It's like saying "if evolution is true, crocoducks should exist". You are (deliberately?) misrepresenting opponent's views. He meant that of all genetic variation affecting IQ, only small, but non-negligible, subset affects both myopia and IQ. However I still don't quite get how larger brain can cause myopia rather than hyperopia.