As far as I've read about it, correlations have been found, but not pointing to any single primary cause. For example, it might be that if you have N out of M u

As far as I've read about it, correlations have been found, but not pointing to any single primary cause. For example, it might be that if you have N out of M unfavorable gene-environment interactions, the development of your vision suffers enough to be considered myopic.