>>345520616
this 
>https://www.youtube.com/watch?v=2ckPBhIlkX0
>https://www.youtube.com/watch?v=J9hSUVU6nYY

I got the lenses off ebay (VRinnovations) which are already treated so I only need to pop them into the HMD without worrying about messing with the distortion profile in software (if you salvage from a gearVR HMD you would need to do that).
When removing the original Vive pro fresnel lenses the first time they are sealed pretty tight (there is no glue) and need to be riggled gently for a while until the airtight seal loosens after that they are very easy to replace. You'd have to be careful not to let your hand slip otherwise you'd scratch the fresnel lenses (if you want to return it to its original form) the black plastic flap might get a little dented so it would be easy for the manufacture to tell you tampered with it, I would not advise doing it if you care about the warranty.
Also don't use a very small/thin flathead I found those easier to slip, use a normal sized one.

The same mod can be applied to the OG vive.
I absolutely love it on the vive Pro for DCS, I can read the text a lot more clearly (less distortion, bigger sweetspot) and for night levels the aspherical lenses are a huge improvement because you don't have the blatant god rays.

I have the pimax 8kX as well, and while those fresnels are better than the vive I still dislike the banding/distortion close to the edges of the lense sweetspot and FoV on the 8kX is fuck massive but it is LCD and requires far too much GPU/CPU to run 4k per eye native even on a 3090/5900x I have to compromise a lot.
The only low/no compromises HMD on the market I know of is the Varjo 3 but that is insanely expensive even compared to the 8kX and you need to pay subscription for software updates since it is targeted at enterprise.