"Digital Focal Profiles" for glasses wearers
In the same way as you do not need to wear glasses when using binoculars, you simply focus the view with your left eye first then tune in your right eye afterwards to achieve total clarity. Please find a way to add this ability digitally so that those of us with sight issues can enjoy 2020 virtual reality. To switch between users eye profiles on the fly would be brilliant instead of fiddling around with custom lenses.
I don't think you understand rudimentary physics. Optical focus cannot be changed digitally. It is entirely to do with the hardware, and has absolutely nothing to do with the software.
The only way you could adjust focus digitally is if the headset had motors that moved the lenses closer and further away from the screen/s, or the if the headset used some sort of varifocal technology, like what Oculus is experimenting with at the moment.