Actually, by and large, myopia is worsened by glasses. I could go on and on about how it actually really is treatable, but who wants to hear that? It's a lot of work, a pain in the azz and has limitations. Free, but limitations.

Glasses are like over-bracing a fracture (or any bone for that matter) the bone will begin to become brittle as it no longer receives the impact or carries the burden it was designed to. It weakens to balance out the effect of the brace.

With glasses to attain 20/20 visual acuity (or better) the eye no longer has to work to focus. It then weakens and adapts to the way your glasses make what's 10 feet away visible the way it would be at a foot or maybe five inches (depending on the severity of your myopia)
Eventually you do reach a point where your eyes lose a large amount of their ability to focus at distance.

For this reason my contacts are half a diopter 'weak', but still compensate for my astigmatism (cant' change eyeshape, but can change focal abilities) to decrease my dependence on the lenses themselves. Unfortunately, I've been too broke to renew the Rx but that's how it goes.