[outworlder]

> myopia truly has an environmental component to it

Very much possible. I only have anecdotal evidence, but if you plotted the amount of time I spent at home starting at a TV versus other kids, you will probably find interesting correlations.

> , e.g. childhood eyestrain and video games.

Why single out video games in particular? If there is a problem, the problem is the screen. Or rather, how close it is. It is unlikely to be related to the content.

I wouldn't be surprised to learn about a feedback loop getting disrupted. For many organs in the body, an approximate shape will work just fine, who cares if an organ is slightly off by a few millimeters. Not so for the eyes.