Does 4K Per Eye Equal 8K?
Last week, we published an article on the Discover 8K website about some of the technology related to 3D and stereo vision and we had a question about whether 4K per eye 3D devices should really be considered by the 8K Association. It’s a good question.
There is a simple answer and that is “Yes”. In some ways 4K per eye 3D or stereo vision is similar to 8K 2D vision. At a very basic level, 4K per eye headsets typically use a ‘square format’ with imagers that are around 4K x 4K. A square format is used because in VR applications, the aim is to be immersive and the viewer is likely to want to look up and down as well as from side to side. In an ideal world, the field of view in VR glasses would be similar to normal vision, although we are some way from that at the moment.
A Lot of Megapixels
4K per eye (meaning 3840 x 3840) means 14.7 megapixels per eye or 29.5 megapixels in total. The 8K ITU broadcast format is 7680 x 4320 or 33.17 megapixels, so the number of pixels is just around 10% less than the ITU format1. This means that many of the challenges of the ecosystem are similar – in particular, how to get all the data into the system very quickly – and 33 megapixels, each of 24 or 30 bits and at high frame rates is a real challenge.
Arguably, the challenge is harder for headsets as VR applications need high refresh rates to give a smooth sense of reality. To complicate things further, VR applications need very low latency. That is, there needs to be very little lag in the video pipeline. So, not only do you have to send a lot of data, but you have to send it very quickly. In contrast, if you are showing a movie, you can do all sorts of processing over several frames in the compression system as the precise timing of each frame, relative to the source, is not that important. (although the timing of each frame relative to others is important).
The Definition is Not Clear
There is a lack of clarity about what ‘4K per eye’ resolution is, and the reality is that truly 4K x 4K per eye is only just arriving in the market today. Varjo (whose demonstrations have always impressed the author) has the XR-4 headset that supports 3840 x 3740 so is pretty close at 14.4 megapixels per eye. However, Varjo headsets are clearly aimed at (and priced for) professional and industrial or military users.
In the consumer headset area, Pimax has announced the Crystal Super Micro headset (57ppd version) which uses LCD panels at up to 90Hz and with a pixel format of 3840 x 3840 – which is 14.75 megapixels, or 29.5 megapixels in total.
Pimax also has a version of the headset that uses two Sony OLED imagers and each eye supports 3840 x 3552 which matches the ITU 8K format horizontally, but is a bit short vertically, over the two imagers. In total, there are 27.3 megapixels in the Pimax OLED headset.
The MeganeX superlight 8K also uses the Sony microOLEDs and supports 10 bit HDR, adding to the bandwidth requirements. Shiftall, which makes the headset, has a Mark II version forecast to arrive in February 2026. The firm has gained some plaudits from customers of the Mk I version as it has announced an upgrade option for existing customers of the earlier version.
The Samsung Galaxy XR, which was released in October 2025, has micro-OLED displays also of 3552 x 3840. Press sources in Korea say that Sony is currently the supplier of the displays, but that Samsung Display is ramping up its manufacturing of the displays to replace or complement the Sony supplied devices.
(Just for completeness, Xeo, a Chinese company has previewed a 4K per eye headset based on Sony panels and at XES 2026, Play for Dream MR announced a headset with the same displays – although it was marked as ‘Sold Out’ on the company’s website when we wrote this article).
Overlap
Now, 4K per eye in 3D doesn’t truly generate a full 8K image. The reason for this is that there needs to be some overlap between the eyes in order to give a sense of depth. Each eye needs to have its own image, but for stereo vision there needs to be some overlap. VR headsets are designed to typically have less overlap than normal human vision (typically 70% to 90%). If there is 70% overlap, effectively there is only a little additional resolution in the overlap area2. If we simplify and take two imagers with 3840 horizontal resolution, the approximate resolution would be 130% of a single eye (30%+70%+30%) or 4,992 resolution horizontally. If we assume that the depth is also 3840, the overall pixel count would be 19.17 megapixels, so below 8K.
Image: Copyright 8K Association
However, as we have written in our White Paper on 8K, the value of 8K is in combining resolution with immersion. It could be argued that adding 3D stereo vision boosts immersion, so 4K per eye headsets might deliver a level of ‘immersion and resolution’ that is not so different from a ‘true ITU 8K’ display with just 2D. As with everything in human perception, it’s difficult to quantify.
- Effectively, the two displays combined would have a 16:8 (or 2:1) aspect ratio if they are both square, while the ITU 8K format has the same horizontal resolution, but a slightly deeper 16:9 aspect ratio, so more pixels vertically (4320 vs 3840). ↩︎
- Human perception is complex, so the precise ‘definition’ would be difficult to quantify – it’s never as simple as just counting the pixels! ↩︎
