Someone on this board has had moderate success with a circular polarizing filter. Ill ask him for more info. Finding a polarized lens, coating the front with a optical quality ar coating, and coating the back with a mirror coating would be nice. This would take care of the light reflecting back off the vfd and washing it out. However, the trouble with normal polarization is that if you are looking at it from the wrong angle, it doesnt work correctly. Not sure how much of the vfd light that will block though. I'll look into some possibilities.