This is an interesting read.
http://www.ehow.com/how_6969280_set-...ty-screen.html
Knightvision
"nightVision is free astronomy software that changes your video card's color brightness settings. This can be used to change the video settings to something less obtrusive to night vision. Some video cards don't support this function, also known as gamma ramping, but most do. KnightVision notifies you one way or the other...."
http://www.ehow.com/how_6969280_set-...ty-screen.html
Red Screen for Windows
Description:
A useful program for astronomers having a PC next to their telescope. It makes the computer screen red, keeping your eyes adapted in the darkness, since the red color does not disturb astronomic observations.
http://www.astrodigital.net/download...ndows.htmlHope something here helps
Trevor