im an italian airforce pilot, i fly on UH-1N, 21st Tiger Squadron on 9th Wing near Naples, and i repeat you that the ANVS-9 (binocular) have a 40° Circle vision, now i have about 300 night-flight hours, and 90% of this hours flew with the anvis 9 and i confir you the circle (a little bit oval) view of the NVG devices, but no so much like DCS a-10c.
On the DCS a-10c the FOV on NGVs are about 90-100°. I write this post only for improve the reality of DCS, not for generate a flame.
next video show the last patch of falcon 4.0, BMS 4.32, watch the video at 0:55, i like it, this is more real, really, i saw this image when i put my eyes on anvis-9 NVD. See the darkness of night on the right and left side of NVG...THIS IS 40° of FOV, I WANT THIS VIEW ON DCS A-10C, I GET REAL!!!!!
or this one, ARMA2
watch 2:37
http://www.youtube.com/watch?v=3bCu2S_4OnQ&feature=related
THX LOTS