About that, a well known problem in VR is that all current headsets have a fixed focal, usually optimized for long distances. The problem is that if you are showing something at a short distance, the eyes will then adjust the focus based on that distance, which is not what the headset shows, so it will look blurry. That's why it is hard to read a book in VR.

Several solutions have been proposed, like varying the focal mechanically based on where you are looking (Varifocal, see Half Dome prototype). There are some others, but the simplest solution is to get old!

With age comes presbyopia, which is the inability for the eye to focus on short distances, bad in real life, great in VR! Because the inability of your eyes and your headset to adjust focus cancel out!