As Heliosurge and a few others know there are at least 3 ways to mod the 4K for presbyopic sight. However, when I did mine it was extremely possible to damage the unit irreparably without sufficient care or luck (probably both). The 4K VR is working well now but I have had a lifetime of electronics experience and I warn anybody that such internal mods are not to be taken on lightly.
If it comes to the 5K or 8K and PiMax have not solved this myopic manufacturing then I would stay clear until they do. From what I can glean from the above there might be some question about non-myopic use of the goggles. PiMax need to state (and guarantee) that there is adequate manual adjustment for long sighted or short sighted people or they are being very short sighted.