The bubble allows you to look at the slopes & still be looking through the center on the otherside. But if one eye is not looking through the opposite lens’ bubble at the same trajectory the warp is created for. 1 eye will be blurred while the other sharp. When looking at the Image we are looking at a reflected projection.
On a flat circlur lens is not very complex to create a distortion image to see properly. Having a les that is not flat on one side creates a differ form of lens warp altogether as now our lens has ay least 3 core distortion patterns.
- Flat lens both sides.
- Curved on one side & flat on the other.
- Then curved on both sides.
The 3rd center being the fun one. As this profile is directly affected by where the pupil is looking at it. Dead center profile A. Outer ouside (off center) profile B. Inner outside (off center) profile C.
Now if 1 eye is centered (A) & 1 eye off center (B or C). Profile does not match rendering profile expected & 1 eye is blurred as a result. Which has a variety of potenial causes. Lens to screen alignment being one. Lens Symetry being off. Large enough Asymetry on eyes. Etc…
Eye tracking being one of the best solution for dymamic correction with knowing exact lens position correlating with ipd relative to focus bubble.
This explains why some are seeing reductions in distortion while others are not.