IPD Wizard discussion: Which software and hardware settings do you use to eliminate eyestrain, crossed-eyes, blur and why?

I use an 8KX for MSFS2020, here’s how i completely relieved my eyestrain:

  1. look in a mirror with a metric ruler on your nose across your face. with one eye open, put it at 0 mark
  2. switch eyes. you should see your other eye over your IPD number. Set the hardware IPD wheel to that.
  3. sit in cockpit in VR (or go in whatever environment). in real-world, have an object at the same distance in front of you, optimally about 1m away
  4. focus on the cockpit gauges, and without moving your eyes, remove the goggles
  5. note how the double-image of the real-world object refocuses. in my case, i initially saw the left image 10mm higher than the right, and maybe 30mm horizontally.
  6. adjust your higher eye vertical offset down a little. repeat 4-5 until your eyes refocus horizontally
  7. adjust software ipd horizontal until vr object and realworld object don’t need any eye refocusing

I was so thankful for the separate vertical offsets! i didnt even know my one eye was a little higher.

Now, i can focus (pun unintended) on MSFS FPS!

edit: i should mention that i had to make slight adjustment on the software horizontal ipd numbers, my brain was telling me i was a giant human walking slowly over a miniature town vs. flying over them at 1000ft

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You are right! I misread your post thinking you consider both situations eligible for the PiTool software offset.

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Im following this with great interest and i really do hope they come up with something magnificent to sort out all these eyestrain issues. I cant say ive been holding my breath though. After owning the 8KX for 3 months + im still plagued by eyestrain whereas on the 5k+ once i found the -0.5 vertical i could use it for 8 hours straight for weeks at a time with no discomfort. If i had it on min 60 ipd or my measured at 64 didnt make much of a difference. The 8kX really isnt worth it set on 64, its like looking trough heavily smudged glasses. 58 would have been perfect but ill settle for a discomfort free experience hopefully at 60

I just did a write up on reddit on how i finally solved my ipd issues which have haunted me badly for years.

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I’d thought I’d ask here too.

NOOB IPD questions.

I’ve had the 8k X for a month now and still can’t get a clear image. I’ve tried the mechanical and Pitool IPD and Vertical Offsets but haven’t really gotten anywhere.

Most annoying issue is Double Vision. No matter what I adjust, I’m having to physically push the hmd to the right to get the image sharper but still double vision.

I noticed when in a Indycar in Iracing the steering wheel is double visioned but if I look ahead it’s a bit clearer but I have to push the hmd to the right to get it sharper.

The mechanical IPD ranges from 60 - 70mm

My IPD is 66mm, the only measurement my optometrist gave me and I’m short sighted. My vision is clear about 20cm/10 inches in front of me then it gets blurry before or after that.

I need guidance as I’m sure I’m adjusting things incorrectly.

Awesome to hear that this worked for you and that you’ve now fixed your eye strain! Your method didn’t work for me though, it seems my eyes really quickly adapt, leaving me almost no time to think what’s happening. However you inspired me to mess around some more time and I can now say, I’ve now cracked it too!! Here’s my solution:

  1. First I messed around with the hardware IPD slider. My goal was to get sharp image in both eyes. What happens is that if one of your eyes is too far away from the lens center, the image gets blurry in that eye (because the edges of the lenses are blurry). So I focused on an object maybe 1-2 meter in front of me and then moving that object a bit and alternate looking through your left and right eye and and try to maximize the space in front of you that you can see sharp with both eyes. My IPD is 69.5 but I ended up using 66. So if you’ve done this part correctly you now have very clear vision, although you might still experience eye strain. So the most important step is the next one, to fix that:

  2. in PE, go to the software offset sliders. First let’s do the horizontal offset. Decouple both sliders, and just move the first one to the left extreme, or maybe to -5. Now use one eye to aim at the + button (with both eyes open it will be hard). Once aimed at the button, open both eyes, (keep your hand steady of course) relax your eye muscles and then start increasing. Relax your eye muscles, so that the image will be garbled up, you’ll see double, and focus on the circle of the slider. You’ll actually see two circles now because of the double vision. Try to have your eye muscle totally relaxed and then keep pressing the +, you will then notice that the two circles (in your double vision) will start to get closer and closer. Just when they touch each other, notice the number. For example Let’s say this happens at -1.2. Then move the same slider to the positive extreme (or maybe +5 is enough). Relax your eye muscle again, start decreasing, while focusing again on that circle of the slider, you’ll see 2 again and while keeping your eye muscle relaxed, keep decreasing until the two circles kiss each other and notice the number. Let’s say this is + 0.6. Now do this several times to make sure your numbers are correct.

At times you’ll accidentally focus and your double vision will be gone, so then just increase the offset again (further away from 0) until you easily see double again and then relax your muscles again.

Also do notice that the more your eye muscles relax, the circles will drift slightly away, further from each other. So it’s important to do this when your muscles are totally relaxed.

If you’ve done that, simply take the average of the 2 settings and that’s what you’ll set it to. So in my example -1.2 + 0.6 = -0.6. Then -0.6/2 = -0.3, so you’ll set it to that, since -0.3 is exactly in the middle of those two.

Then do this for the other eye too.

After that do the horizontal offset. Decouple the sliders. This time focus on the slider horizontal lines. If you set the first eye to for example -5 you’ll see double, then start increasing until the lines are aligned, notice the number again, Then do it from the max, start decreasing, notice that number and take the average. Then do it for the other eye and set it again to the average.

This really fixed my eye strain. In fact I now have razor sharp image, MUCH better 3d effect, way better immersion and everything just looks and feels so much better now! In fact, this now feels like a whole new headset and I can honestly say it’s now the first time that I’m REALLY enjoying the 8kX-!

BTW, it’s probably best if you do this step 2 with an object (the lines/circles) in the distance, since that’s where you won’t have double vision in real life with eye muscle relaxed. I didn’t set it that far away though and it seems to work perfectly, but I’ll try and tweak it some more. Then again, I’m already really happy with the result, this really feels like a new headset now!

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Thats so awesome!! :+1:

Heres some useful threads on IPD I have saved. I can’t really offer much in the way of advice as I have constant double vision anyway so what works for me definitely won’t work for anyone else, since my eyes look at images like this | |, Rather than like this /\

Any IPD setting discrepancies to my actual IPD don’t cause me any discomfort (because I already have double vision) for me setting the IPD is an exercise of making the blur and eyestrain from only seeing one image clearly at one time go away, and I have to reduce my hardware IPD to the minimum 60mm (my measured IPD is 65mm).

Fortunately my condition makes Pimax headsets a lot more bearable to use when using the incorrect IPD settings.

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To help Pimax with the IPD Wizard, I think each of us should try some of the IPD guides posted above, see if any work better than what you’re already doing.

Then report back to this thread to let @sweviver @arminelec know what you used to do for IPD adjustment, and what you might be doing now instead after reading the guides in this thread to get an even better experience. That feedback and the best guides can then be put into the IPD Wizard.

@Djonko and @Risa2000 have also contributed some really interesting insights on how the software IPD now works in Pimax after the recent pitool update which might help anyone get a better understanding of how the IPD adjustment worked before and after the Pitool update, for any who have missed it.

Sounds like you might need to do the extreme IPD mod to get a clear view in both eyes. 65-64mm measured IPD set to 60mm seems to be the cutoff point before both eyes are blurry looking straight ahead. https://amp.reddit.com/r/Pimax/comments/bq4q8f/extreme_ipd_mod/

As has been mentioned by others before it is suspected that the reason some people have clarity issues with the 8KX but not with the 5K+, is potentially due in part or in whole to the fact that Pimax used smaller displays for the 8KX without changing the lenses, and without shifting the displays further back or further forward to compensate for the fact the displays are smaller whilst the lenses remained unchanged.

@stixvr you asked me about this in another thread and I don’t have an answer beyond that, the discussions on the issue has been buried but it has been talked about shortly after the 8KX released. If someone else who knows more on why there’s clarity problems on the 8KX for people who have used the 5K+, whilst those same people having no clarity issues on the 5k+, that discussion would be useful to have.

It’s also been speculated that it could have to do with the rendering or view distance in the Pimax is set to a certain amount on the 5K+, and this view distance may be changed in the 8KX due to smaller display panels being used, which could be causing some problems.

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Try doing what @smitty suggested in his post 4 posts above yours in this thread, if that doesn’t work try using some of the IPD guides I linked in this thread.

If that doesn’t help, maybe using an IPD offset in fpsVR to account for vertical or horizontal eye asymmetry might help you more than the current Pitool software IPD offset would help, if you do indeed have a slight vertical or horizontal eye asymmetry.

Try using Risa’s second IPD guide PiTool IPD offset - how does it work - but substitute using Pitool for fpsVR since Pitool no longer changes virtual camera rendering positions if you suspect you have a horizontal or vertical eye assymetry which may be causing your double vision.

Ive done the extreme mod but the hmd decided to die on me later on. It was glorious (at the cost of geometry) but cost me due to warranty so im skipping it on this one. The 5k+ wasnt any different in terms of clarity but it was masked by the lower res panels. Thats my opinion at least.

that’s also possible, if you’re saying that the lower panel resolution made that clarity change between the centre and edges of the sweet spot less apparent to you?

there have been multiple reports of people having clarity issues with the 8KX that they didn’t have with the 5K+ though, which leads me to believe that it may have something to do, in part or in whole, with the smaller panels used in the 8KX

@Zen I was mucking around in Pitool and when hovering over Parallel Projections it said if the image was superimposed was to turn it On. Turning On Parallel Projections has helped correct “double vision” somewhat. I purchased fpsVR and offset the IPD, 63MM + 3MM = 66MM, which is my IPD. Still figuring out where to set the mechanical IPD, I set that at 66mm according to the in-screen display.

@thenic123 Parallel projections should be out of this thread; if you set your HMD correct (ipd slider and software ipd offsets), you will be able to see good with or without parallel projections (pp) in most of modern games.

Use pp=off whenever possible, as it is about 25-30% better picture. You can test it in steamvr house. Only some (older) games have need for pp=on, then you need to switch it on. It is easy to recognize it, then the pictures in HMD (pp=off) are really wrong, you can not look on it more than 10 seconds.

@BrziJoe Is Iracing considered a older game?

I’ll have another go with PP off as I have fpsVR now. My eyes without prescription lenses don’t help the situation either.

I do not have Iracing so I do not know about it.

Please test your visuals in SteamVR home. Set pp=off, and try there to look.

  1. set your hardware ipd slider. Close one eye and try to find best position, where you see mostly trough sweet spot. Then switch eyes, it should be mostly clear on both eyes (1 by one).
  2. after first step open booth eyes, and dial proper software ipd values. That is hard, really hard to do. Your eyes will try to adopt on any settings, and from time to time you will think it is ok, but it is not. For this use guides described above.
    Your target is to have booth of your eyes relaxed, with clear stereo view, and natural 3d geometry.
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Mechanical IPD is set by turning the IPD knob/dial on the headset itself.

Software IPD offsets in Pitool now move the display render position, exactly the same as when the lenses are moved by adjusting the mechanical hardware IPD dial on the headset itself, but without actually moving the lenses.

FpsVR software IPD offset changes the virtual camera rendering position, which is different to what changing the IPD dial on the Pimax headset and the software IPD offset in Pitool do.

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i dont think thats correct the ipd dial on the headset also impacts the virtual camera position (where your eye’s are) impacting how the picture is rendered and warped to compensate the lenses

the “new” offset used with just moving the picture hor. or vert. on the display is a compensation for miss alignment of lenses and displays, because the eye strain is a effect of inexact alignment or asymmetric eye’s (but i dont think the eye thing is for real as we dont see that problem in other headset, more of a keep the face in asian culture when referring to that as a reason) - at least thats how i see it

what it’s doing now would be more correct the “old” offset was moving the virtual camera
having this is still needed for people with a ipd outside what the dial can handle, and that’s where fpsVr comes in handy

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