Eyestrain issues are a unanimous assessment among Reddit testers during group meetups to test the 5k and 8k



Look at the OPs posts in this thread, there have been meetups to test the eye strain and IPD issues with multiple backers who have above 60mm IPD.

All the OPs tester friends (6 of them) also have reported experiencing some eye strain after fitting headsets to their heads extensively, indicating some improvement to correct IPD issues and eye strain need to be made.

Asking for clarity on this has resulted in posts on the subject been deleted and ignored, the matter of fact is that there is a big issue with minimal IPD and eye strain being swept under the carpet, which has resulted in many backers and preorders having to sell their headsets after fitting and after trying their best to achieve clarity, because they were simply unable to no matter how hard they tried.

Pimax specified 55mm minimal fov in the kickstarter product specifications, they delivered a product which is 70mm minimal fov (or 60mm if you believe pitool which supposedly takes into account the fact the displays are cantered).

Pimax’s only address to this was that they would make a better face foam adding more distance, this may fix the issue for some, but would unlikely resolve the issue for people with 55mm IPD as some users with 64mm IPD are reporting being unable to get clarity in both eyes and/or eye strain as well.

What’s the plan to address the fact users with 55mm IPD can’t use their devices when they may have backed under the premise that they could use it because of minimal 55mm fov?

Bump this issue until it addressed with an actual solution.
@PimaxUSA @Dallas.Hao @Sean.Huang @Doman.Chen @Alan.sun @Matthew.Xu @xunshu @mozi @Pimax-Support @PimaxVR

Here’s some possible solutions for you to explore

  1. New 160 fov lenses and adaptors to reach 55mm IPD, removing a section of the inner lens above the nose.
  2. Software IPD adjustment.
  3. Individual per eye IPD knobs on future models, old devices exchangeable for new models for those who have IPD issues.
  4. Redesign of lens seatment in future models to allow for smaller IPD adjustment, old devices exchangeable for new models for those who have IPD issues.


Just new lenses to replace would be nice, because they are realy easy to take out. I got a IPD of 64 and there are just 3 - 4 mm missing for a perfect image. I would pay for it if needed, just to get a solution.

PIMAX, Is there a plan to fix eye-strain and IPD issues to make the 5k+ and 8k headsets more useable for people with less than 60mm IPD? Small IPD/160 FOV lens replacements and adaptors?

Polls are also showing a fairly large amount of backers are experiencing eye strain with 64mm or less IPD, currently more users, than those not experiencing eye strain. DO you get Eye Strain or blur in one lens with an IPD above or below 64mm?

Could the community get a response with an actual solution to address low IPD users with 55mm IPD being unable to get clarity in both eyes and having to sell their preorder and backer headsets? Thats at least 5mm less than the minimal supported IPD and 5mm short of the minimal IPD outlined on the kickstarter product specifications. (60mm/70mm is the minimal IPD current headsets can go down to.)

Also a response on an actual solution to address the eye strain issues reported unanimously by 6+ backers all with over 60mm IPD testing each others headsets, which has also caused preorders and backers to sell their headsets after extensively trying to make them fit properly to not cause eye strain and get a clear image in both eyes and still being unable to use them?


Can you post links to specificstions on ipd? I have only found 1 post in the forums on ipd range from a pimax rep. The Kickstarter page doesn’t have ipd range on spec page or Faq.

I will look into deleted posts. I have moved posts to topics that already exist & will likely work on merging duplicate topics.

EDiT: None of your posts have been deleted related to ipd issues.


There is not enough study to say those experiencing eye strain are greater or lower than those who do not.


Actually I put a couple of posts related to IPD issues in an attempt to get an official response detailing a solution to the problem, because Pimax was avoiding and diverting from the question asking for solution in the IPD thread, but my posts in this thread on the IPD issue and eye strain were in fact deleted, meaning my posts had been seen, they were not addressed and the subject was avoided. The Actions and Plans on Pimax after-sale services


No your post was not deleted. I moved it to topic already existed for ipd.

Your profile shows what was deleted & by whom.


There’s in fact a forum poll on the issue which can give a pretty good indication on the severity of the issue on the basis of the average of results from users who participated. Regardless, an issue like this where people between 60-65 IPD can’t use the headset at all due to eye strain should not be ignored when the minimum on screen says 60 (but the real measurement is 70?)


Look at the details listed in the pamphlet provided in the box your 5k came with, it’s on there. I’m almost positive I saw it on the Kickstarter as well ages ago, I’ll try to find it now.


The poll will be good to measure members in the forum yes. But without doing a real poll sent to all whom have received the headset will not give a real level of accuracy.

There are also users reporting no eyestrain at 60mm. Now in that group hard to say. But from what is seen might not be as common. But needs proper research. The lens design you even said I believe said 60mm by angles of the bubble.


From scanning the kickstarter if there must be buried in comments section.

But yes the pamphlet does say 55mm.

@Dallas.Hao @pimaxusa


Results are indicative of a potentially large scale problem going by the average of the results already given, and out of the current participants there are more users who have the problem than not.

It’s not just the polls either, 6 testers with 60+mm IPD have met up to test eachothers headsets and unanimously found eye strain issues, so all 6 in in agreement. So there is clearly an issue, even for the users who have above the minimal supported IPD for pimax at 60mm.


That explanation still doesnt entirely make sense to me when its measured to 70mm minimum physically, and users with 64mm have a problem at “60mm” on screen. The horizontal physical distance between both lenses is 70mm right? How can the diagonal lenses even affect the horizontal measurement of distance between the nose?


Truth as there are also nimbers of folks with ipd around 60mm without strain also can indicate biological factors by region. But cannot measure a true scale without a proper evaluation with proper sampling. We simply do not have enough users with headsets in the forum.

Much like the true statemrnts 2 out of 3 people prefer coke & 2 out of 3 people prefer pepsi.


Convex mirrors help remove blindspots. Simply put special purpose designed lenses. Without knowing there properties we can’t rely on conventional means.


Because the bubble is is convexed it can alter how the center is viewed. Granted I suspect there will be limits as to how far this will work as it needs more complicated warp calculations as it needs to add angle of the pupils as well. This is likely why there is a split in perceived distortions as for some ipds it is more optimised for some. With this lens design eye tracking for dynamic corrections is more of s need than gen1 headsets.


A unanimous assessment of eye strain issues from 6 testers with over the minimal 60 IPD and the current status of the poll lead me to believe the issue is bigger and more prevalent than acknowledged, and in fact it may only be 1/3 of users with over 60 IPD who don’t experience eyestrain and the other 2/3 do when their measurements are supposed to work.

Definitely as more results come through if the ratio of divergence remains the same between users who experience the problem and those who dont, then the average result will have more weight as results are input by wider audience.


If anything, a convex or curved line would increase in length when straightened, not decrease. That wouldn’t make the measurement of the physical lens distances (70mm) any less, it would make it more. (If the convex lenses/line was straightened) The physical minimal IPD range of the hardware has been measured at 70mm.


Here’s more users saying the same thing on a different reddit thread. So it’s being said by many users on this forum, multiple reddit threads, a unanimous verdict of eyestrain from 6 +60IPD backers and more users than not so far have voted having experienced clarity/eye strain issues in the poll on this forum.


The above demonstrates the possibility that biological differences by region can be a factor as I am sure this meetup was not 6 international friends but ones likely live in the same region.

There is also the problem of biased testing without using things like blind testing.

Keep in mind; I am not trying say it is or isn’t a big problem. It is a problem and maybe fixed to a degree with software augmemted ipd offsetting or dynamic correction via eye tracking.

Vr frames with special lenses msy help as well.

Interestingly enough the 60mm seems to be a general barrier in VR atm as the link I posted regarding Vive Pro also lists 60mm from an HTC staff saying screens & optics currently limit ipd.

From my general inet research over the last few days. Grounding down the optics for lower ipds might be way needed & likely only work on something like a wide fov headset due to unique lens shape install would be more consistant than round ones.

But cost vs gains becomes a pickle. With Gen1 on theory they could build 2 skus of hesdsets but the low ipd headsets would cost likely condiderably more & risk more QA issues in gen1 low ipd headsets.