How are recess, near-sightedness & student academic achievement connected?

Many more students than we realize have poor vision and need eyeglasses. When they get them, academic achievement improves:
http://www.politico.com/…/how-free-eyeglasses-are-boosting-…

But why do so many kids need eyeglasses? It turns out that lack of recess and inadequate outdoor time contribute to near-sightedness:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4495846/

Yet another example of the failings of narrow, tunnel-vision, non-whole-child perspectives.

Let's make sure that kids have enough recess AND eyeglasses.

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