Is this a Pimax thing?

[Moxica]

I get these transparent shades, one for each eye.
They're worse when looking to a bright background.
Sometimes, looking at darker BG, they get a bit brighter.
Wut is dat?

(I replicated the artifact in photoshop, and it is a tad exaggerated, but they look just like that, except they are centered.)

[Nodak]

That is quadviews in action, fortunately you have options to adjust them or simply turn them off.

[MadMonty]

Try switching SSAO off in DCS

[Calvin.Pimax]

SSAO off will eliminate this. 

[Moxica]

11 hours ago, Calvin.Pimax said:

SSAO off will eliminate this. 

I've never used SSAO.
It is allready off.

[Gun Jam]

In my case it significantly reduced the issue. but I can still see it. Turn SSAO on and see if its worse. 

[Moxica]

7 minutes ago, Gun Jam said:

In my case it significantly reduced the issue. but I can still see it. Turn SSAO on and see if its worse. 

Just tried that; No joy.
BUT.
..it was the quadviews.
But with QW off, it is even more jittery and swimmy.

[Gun Jam]

So SSAO on VS off looks the same to you?

And yes it is 100% a QV issue. However I'm quite surprised that SSAO "on" made no change on your end.