These goggles are designed like swimming goggles, in that they fit BELOW your eyebrows. Hence the problem whenever you aim with one eye closed, due to the following sequence of events:
1) You close your non-dominant eye (let's say left eye) to aim with your dominant (right) eye.
2) Deliberate closure of your left eye requires contraction of the left orbicularis oculi muscle - so your left eyebrow is pulled downward when you squeeze you left eye closed. This obviously does not happen with your right eye, because you are leaving it open to aim.
3) Your left eyebrow is then pulled BELOW the top rim of the left eyepiece frame - so your left eyebrow is now inside the left goggle, and your right eyebrow is still outside and above the right goggle.
4) You finish aiming / shooting, so you open your left eye again. Your left orbicularis relaxes, and your left brow now rises to its normal relaxed position.
5) Unfortunately, your left brow is trapped inside the goggle frame. Opening your left eye (by relaxing and therefore raising your left brow) pushes the whole left goggle up because your left eyebrow is trapped inside the left goggle, under the upper frame.
6) Now the goggles are angled and not fitting any longer, with the left goggle noticeably higher on your face compared to the right goggle. You also have some visual distortion, as the polycarbonate lenses are at slightly different angles relative to each other.
So every time you close and open your non-dominant ey...