Or flail your legs around in a slippery plastic dish to control a lobster. I still like that idea more. Also, Palmer, I just did some math, and got that from 4 inches away, you would need approx 27502 PPI Lul. I'm sure your lenses mess with that number a bit, but still... that's a fun number. I feel like I already threw out a number close to 16k in this thread, actually. I think it was 8k, but halfway to the limits of human perception is probably good enough. edit: yep, I said 8k.
The rift has built in focusing mechs. Just put it slightly out of focus. This creates the same effect, only better.
If you take a light sandpaper and scratch up your cornea, it will help diffuse light, and create a full 3D immersive effect for the Occult Rift.