I have just figured that using kitchen towel rolls as a binoculars is the easiest way to do a parallel eye on these kind of images. Try that. Hold the rolls l

I have just figured that using kitchen towel rolls as a binoculars is the easiest way to do a parallel eye on these kind of images. Try that. Hold the rolls like binoculars where right roll is pointing at right image and left is at left image. It's like a DIY VR headset where your brain/eyes only gets two same looking things to focus. No outside noise.