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How I fixed the problem:
First I removed the eyepieces from the Rift and I shaved off the plastic ridge on the bottom using an Exacto knife (hobby knife, like a pen razor). This allows the eyepieces to move laterally in relation to the screen.
I pushed my eyepieces outwards a couple of [mm] and then used electrical tape to tack the optics in place. Nothing too scientific, I just kinda eyeballed where they should sit and it worked out pretty well.
Then rerun your IPD in the software. It shouldn't change too much, but since you've now reoptimzed the optical position of the eyepieces you'll have better peripheral vision and you may get slightly different results.
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Honestly, this single change made an incredible difference for my overall enjoyment of being in the Rift.
Jericho
This is exactly what I have done after having purchased the VRGear adjusters and found they made things worse.
The reason they make things worse is they introduce 2.5mm further distance from the lens to the screen and this made the image totally out of focus for me.
As said, you only have to move each lens about 1mm to make the difference (depending on your actual IPD) i found I can also move the lenses down slightly because before, the rift was resting on my nose to get to the sweet spot.
Lastly, I use the IPD interceptor software which can be found on the VRGear website because moving the lenses physically requires the images to be moved otherwise scale and perspective is out.
Having done this, I find more of the screen is in focus, I can play for longer (in fact as long as I like) without getting eye strain and I spend less time trying to move the DK2 around to get the sweet spot.
So my list of mods which have all helped me enjoy the DK2 more are;
1: Matte screen protector to reduce SDE
2: Cut lip off the lenses so they can be moved around
3: IPD interceptor tool
4: VR Cover to make it more comfortable to wear
Software:
1: Reshader to sharpen image
2: in game SS 1.5x or 2x to sharpen text
3: NVCP settings as per Dr Kaii's awesome thread (with some tweaks for my own personal preference)
After all this, I'm quite happy with the performance and certainly have no interest in playing on any flat screen panel.