Is There A Way To Improve Eyesight Naturally? And Is Lasik Eye Surgery Available For People With Astigamatism?

I’m 20 years old and my eyesight is really bad (probably from all the years of video games, tv, and surfing the internet). I’ve decided to limit my time spent on these activities, but what I want to know is if there’s a way to improve your eyesight without the use of glasses or contacts?
Also, I’ve heard from someone that people with astigmatism can’t get that eye restoration surgery. Is that true? Not that I can afford it right now anyway, I just want to know my options later on.