and they are "goggles" so left/right field of view is limited ( unless looking directly at the object ) and even then, i can imagine the depth issue unless you stay on that object to determine speed/heading etc.
Just glancing at wont give you enough information.
NVGs are more like a projection into your eyes. Not really like putting glasses on and you just see at night. The field of view is very limited which is why you have to constantly keep turning your head to see what's going on.