I am far sighted (ie. I struggle with objects up close but see quite well at a distance) and normally wear glasses or contacts. I use the rift without any correction, and it works perfectly.
My vision problem is not minor (relatively strong correction), although I can function without correction since I am still relatively young (40..

). I can drive or bike without correction if I have to even if it is tiring on the eyes. I also have astigmatism.
As mentioned earlier, the content in the Rift is basically presented at infinity regardless of the "virtual distance" in game.
So, since (as far sighted) you theoretically see well at infinity, the rift will negate your vision problem. I have no eye strain whatsoever using the Rift even for extended periods of time. It relaxes the eyes since they don't have to bend the lens at all and I do not miss my glasses at all.
Naturally the opposite applies for those that are nearsighted, they will have to use their glasses/contacts with the rift.