I pulled my white ring sight out of the spare parts drawer and tested it with a GEN 3 PVS-14A in a completely dark room.
The tritium "T" sight was clearly visible through the NV device, but I was unable to see anything through the sight due to significant bloom and glow from the tritium vial at the bottom of the sight. This blooming obscures anything you might be able to see and precludes precision aiming.
I believe the ring sight has just too small an aperture to see through for effective night vision use.
My normal rig is an EoTech 552 and I am able to adjust it low enough to get a good clean ring and aiming dot as well as see targets through the sight window out to 100 yards, and further if I activate an IR illuminator (DBAL-A2). My laser pointer is co-witnessed with the EoTech dot at 100yds and allows me to selectively put the dot on a target if my head is in the sight, or just use the laser dot if necessary.
The factory ring sight just doesn't cut it in the dark.