It doesn't allow your eyes to focus like they do normally--it needs eye tracking so that it can adjust the convergence point to match how your eyes work in real life--think of how you might have trouble looking at things further away after looking at a computer screen all day. But, that effect is very minimal, you won't likely be using it enough for that to be a problem. Other things will always improve--screen resolution, refresh rates, etc. The ones that are coming out are likely to be using 2k resolution screens which is better than what we have right now. But probably the more ideal point is to have 4k screens. The only issue there is that most people aren't going to be able to run games at that resolution.