Only valid answer . <| sep |> Not necessarily . Human vision doesn ' t work like a camera , we only perceive full detail in a very narrow frustum . If a game engine knows where the eyes are looking , it only needs to render at full detail in that spot . It ' s called foveated rendering and it ' s already been implemented in basic forms that is , without eye tracking in software today , though it causes everything that isn ' t in the centre of your vision to look somewhat softer . If you look straight forward though , it isn ' t noticeable . It ' s not out of the question for there to be practical 4 K panels in HMDs in the near future provided they get the eye tracking right and recent developments have indicated that they ' re getting quite close to nailing it .