There are two varients of this unit, the PVS-7A/C unit and the PVS-7B/D unit. The B/D unit is currently in production and easy to find. The A/C unit has been out of production for several years, so it's a little more difficult to acquire.
Either unit can be easily adapted for visual astronomy use by exchanging the 1X objective lens that is typically available for either goggle with a custom c-mount adapter. This adapter has been available from Aurora Tactical (for the B/D goggle) and Nightline, Inc. (for the PVS-7A/C unit). The c-mount adapter allows for simple telescope adaptablity by merely adding a c-mount to 1.25 inch (or larger) telescope nosepiece.
When connected to a telescope, either unit provides bright, pleasing TWO-eyed views of many DSO's. The oculars present sharp images across the entire apparent FOV with uniform brightness. The bi-ocular view is accomplished by an optical element called a collimator which sits just behind the output screen of the image intensifier tube. The collimator relays the image from the intensifier screen, sends it into a beam splitter (bifurcating mirror), and then onto the oculars - like this: