Lesson number one. Night vision monocular and Progressive eyeglasses do not mix!. However, things sharpen up nicely without the glasses.
Lesson number two. Holy cow! Actually, it is bigger than that. Holy COWS! I am amazed at the view through this thing. The videos that demo this stuff do NOT do them justice. Maybe is it just my crappy eyesight, but I do not see any scintillation. I am sure it is there, but it is like I am looking at 4K black and white video. I just went outside for a quick look around when I took out the dog. There were some high thin clouds, but I could see a few stars. Through the NV there were a lot more stars. The clouds showed a very nice texture that was fun to look at as well. Viewing with both eyes open was very comfortable, and I could take in the whole available FOV. The back yard looked like day time and my black/brown dog, who was invisible in the shadows with normal eyesight was visible as if it were daylight. Amazing. I cannot wait to pair this with a scope!!
Great to hear the PVS-7 is so fun for you. The issue of bandpass and long pass filter selection is very subjective based on the degree of LP you commonly observe through, the scope you use, and on your personal preferences. Selecting a long pass filter is pretty straight forward, but there are considerations not mentioned above. The 610nm does not show H-a at all and blocks mild to medium LP; a 640nm blocks more light pollution but can faintly show bright nebulosity (like the Lumicon Night Sky filter); the 685nm is for the most severe light pollution and blocks all H-a/nebulosity. I have both the Night Sky filter at 640nm and the 685nm filter; I use them about equally often, depending on what I want to see. But all filters block light, so keeping filtration to an adequate minimum means you have an increasingly brighter image.
The focal ratio of your scope also plays a part in your filter selection. A faster optical system provides a brighter native image which may allow for a narrower pass band filter. But the more light that is blocked by a filter, the more scintillation will show as the the NVD has to work harder (scintillation is a result of photon starvation in the tube).
The H-a bandpass filters are a bit more complicated. First, they are available in a wide variety of band widths from 35nm to 3nm... this makes it easier to customize to the conditions through which you commonly observe. But it also makes it more difficult to know which one is right for your conditions. The more LP you observe through, the narrower the band width as a general rule. But there are other issues. The narrower the band width, the more field stars are attenuated, AND, the more band shift will cause a special type of EoF darkening. The wider the band width, the less the H-a emission will be visible. Some observers like to see field stars; some don't care about the field stars and want the nebula to stand out as much as possible.
The answer is to read as much as you can about NV filter use and try one you think is right for your scope and observing conditions; the best place to start is found under the BEST of NV thread pinned at the beginning of the forum, then select NV Filters and read the threads there. My band pass filters include a 12, 8, 7, 6, & 3.5, and previously a 5nm. I am coming around to the point where I use the 6 or 3.5 often for visual use and the 12, 8 & 6 for phonetography. When used visually, there is very little that distinguishes a one or two nanometer step between filters. When I'm at a dark site I may select a filter that shows field stars best, so I go with the 8nm or 12nm, OR, I may want to see very faint nebulosity that often extends away from the main subject, so I go with a 6nm or even the 3.5nm. But filter selection is largely based on your conditions and preferences and on the focal ratio of your scope. As suggested by others, a 6-7nm filter is a good place to start under almost any conditions. Good luck and have fun.